diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index b766c809..f6507012 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -1,4223 +1,4223 @@
 /**
  * Client UI Javascript for the Calendar plugin
  *
  * @author Lazlo Westerhof <hello@lazlo.me>
  * @author Thomas Bruederli <bruederli@kolabsys.com>
  *
  * @licstart  The following is the entire license notice for the
  * JavaScript code in this file.
  *
  * Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
  * Copyright (C) 2014-2015, Kolab Systems AG <contact@kolabsys.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  *
  * @licend  The above is the entire license notice
  * for the JavaScript code in this file.
  */
 
 // Roundcube calendar UI client class
 function rcube_calendar_ui(settings)
 {
     // extend base class
     rcube_calendar.call(this, settings);
     
     /***  member vars  ***/
     this.is_loading = false;
     this.selected_event = null;
     this.selected_calendar = null;
     this.search_request = null;
     this.saving_lock;
     this.calendars = {};
     this.quickview_sources = [];
 
 
     /***  private vars  ***/
     var DAY_MS = 86400000;
     var HOUR_MS = 3600000;
     var me = this;
     var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone || 0) - (settings.dst || 0);
     var client_timezone = new Date().getTimezoneOffset();
     var day_clicked = day_clicked_ts = 0;
     var ignore_click = false;
     var event_defaults = { free_busy:'busy', alarms:'' };
     var event_attendees = [];
     var calendars_list;
     var calenders_search_list;
     var calenders_search_container;
     var search_calendars = {};
     var attendees_list;
     var resources_list;
     var resources_treelist;
     var resources_data = {};
     var resources_index = [];
     var resource_owners = {};
     var resources_events_source = { url:null, editable:false };
     var freebusy_ui = { workinhoursonly:false, needsupdate:false };
     var freebusy_data = {};
     var current_view = null;
     var count_sources = [];
     var exec_deferred = bw.ie6 ? 5 : 1;
     var sensitivitylabels = { 'public':rcmail.gettext('public','calendar'), 'private':rcmail.gettext('private','calendar'), 'confidential':rcmail.gettext('confidential','calendar') };
     var ui_loading = rcmail.set_busy(true, 'loading');
 
     // general datepicker settings
     var datepicker_settings = {
       // translate from fullcalendar format to datepicker format
       dateFormat: settings['date_format'].replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
       firstDay : settings['first_day'],
       dayNamesMin: settings['days_short'],
       monthNames: settings['months'],
       monthNamesShort: settings['months'],
       changeMonth: false,
       showOtherMonths: true,
       selectOtherMonths: true
     };
 
     // global fullcalendar settings
     var fullcalendar_defaults = {
       aspectRatio: 1,
       ignoreTimezone: true,  // will treat the given date strings as in local (browser's) timezone
       monthNames : settings.months,
       monthNamesShort : settings.months_short,
       dayNames : settings.days,
       dayNamesShort : settings.days_short,
       firstDay : settings.first_day,
       firstHour : settings.first_hour,
       slotMinutes : 60/settings.timeslots,
       timeFormat: {
         '': settings.time_format,
         agenda: settings.time_format + '{ - ' + settings.time_format + '}',
         list: settings.time_format + '{ - ' + settings.time_format + '}',
         table: settings.time_format + '{ - ' + settings.time_format + '}'
       },
       axisFormat : settings.time_format,
       columnFormat: {
         month: 'ddd', // Mon
         week: 'ddd ' + settings.date_short, // Mon 9/7
         day: 'dddd ' + settings.date_short,  // Monday 9/7
         table: settings.date_agenda
       },
       titleFormat: {
         month: 'MMMM yyyy',
         week: settings.dates_long,
         day: 'dddd ' + settings['date_long'],
         table: settings.dates_long
       },
       listPage: 7,  // advance one week in agenda view
       listRange: settings.agenda_range,
       listSections: settings.agenda_sections,
       tableCols: ['handle', 'date', 'time', 'title', 'location'],
       defaultView: rcmail.env.view || settings.default_view,
       allDayText: rcmail.gettext('all-day', 'calendar'),
       buttonText: {
         prev: '&nbsp;&#9668;&nbsp;',
         next: '&nbsp;&#9658;&nbsp;',
         today: settings['today'],
         day: rcmail.gettext('day', 'calendar'),
         week: rcmail.gettext('week', 'calendar'),
         month: rcmail.gettext('month', 'calendar'),
         table: rcmail.gettext('agenda', 'calendar')
       },
       listTexts: {
         until: rcmail.gettext('until', 'calendar'),
         past: rcmail.gettext('pastevents', 'calendar'),
         today: rcmail.gettext('today', 'calendar'),
         tomorrow: rcmail.gettext('tomorrow', 'calendar'),
         thisWeek: rcmail.gettext('thisweek', 'calendar'),
         nextWeek: rcmail.gettext('nextweek', 'calendar'),
         thisMonth: rcmail.gettext('thismonth', 'calendar'),
         nextMonth: rcmail.gettext('nextmonth', 'calendar'),
         future: rcmail.gettext('futureevents', 'calendar'),
         week: rcmail.gettext('weekofyear', 'calendar')
       },
       currentTimeIndicator: settings.time_indicator,
       // event rendering
       eventRender: function(event, element, view) {
         if (view.name != 'list' && view.name != 'table') {
           var prefix = event.sensitivity && event.sensitivity != 'public' ? String(sensitivitylabels[event.sensitivity]).toUpperCase()+': ' : '';
           element.attr('title', prefix + event.title);
         }
         if (view.name != 'month') {
           if (event.location) {
             element.find('div.fc-event-title').after('<div class="fc-event-location">@&nbsp;' + Q(event.location) + '</div>');
           }
           if (event.sensitivity && event.sensitivity != 'public')
             element.find('div.fc-event-time').append('<i class="fc-icon-sensitive"></i>');
           if (event.recurrence)
             element.find('div.fc-event-time').append('<i class="fc-icon-recurring"></i>');
           if (event.alarms || (event.valarms && event.valarms.length))
             element.find('div.fc-event-time').append('<i class="fc-icon-alarms"></i>');
         }
         if (event.status) {
           element.addClass('cal-event-status-' + String(event.status).toLowerCase());
         }
 
         element.attr('aria-label', event.title + ', ' + me.event_date_text(event, true));
       },
       // render element indicating more (invisible) events
       overflowRender: function(data, element) {
         element.html(rcmail.gettext('andnmore', 'calendar').replace('$nr', data.count))
           .click(function(e){ me.fisheye_view(data.date); });
       },
       // callback when a specific event is clicked
       eventClick: function(event, ev, view) {
         if (!event.temp && String(event.className).indexOf('fc-type-freebusy') < 0)
           event_show_dialog(event, ev);
       }
     };
 
     /***  imports  ***/
     var Q = this.quote_html;
     var text2html = this.text2html;
     var event_date_text = this.event_date_text;
     var parse_datetime = this.parse_datetime;
     var date2unixtime = this.date2unixtime;
     var fromunixtime = this.fromunixtime;
     var parseISO8601 = this.parseISO8601;
     var date2servertime = this.date2ISO8601;
     var render_message_links = this.render_message_links;
 
 
     /***  private methods  ***/
 
     // same as str.split(delimiter) but it ignores delimiters within quoted strings
     var explode_quoted_string = function(str, delimiter)
     {
       var result = [],
         strlen = str.length,
         q, p, i, char, last;
 
       for (q = p = i = 0; i < strlen; i++) {
         char = str.charAt(i);
         if (char == '"' && last != '\\') {
           q = !q;
         }
         else if (!q && char == delimiter) {
           result.push(str.substring(p, i));
           p = i + 1;
         }
         last = char;
       }
 
       result.push(str.substr(p));
       return result;
     };
 
     // Change the first charcter to uppercase
     var ucfirst = function(str)
     {
         return str.charAt(0).toUpperCase() + str.substr(1);
     };
 
     // clone the given date object and optionally adjust time
     var clone_date = function(date, adjust)
     {
       var d = new Date(date.getTime());
       
       // set time to 00:00
       if (adjust == 1) {
         d.setHours(0);
         d.setMinutes(0);
       }
       // set time to 23:59
       else if (adjust == 2) {
         d.setHours(23);
         d.setMinutes(59);
       }
       
       return d;
     };
 
     // fix date if jumped over a DST change
     var fix_date = function(date)
     {
       if (date.getHours() == 23)
         date.setTime(date.getTime() + HOUR_MS);
       else if (date.getHours() > 0)
         date.setHours(0);
     };
 
     var date2timestring = function(date, dateonly)
     {
       return date2servertime(date).replace(/[^0-9]/g, '').substr(0, (dateonly ? 8 : 14));
     }
 
     var format_datetime = function(date, mode, voice)
     {
       return me.format_datetime(date, mode, voice);
     }
 
     var render_link = function(url)
     {
       var islink = false, href = url;
       if (url.match(/^[fhtpsmailo]+?:\/\//i)) {
         islink = true;
       }
       else if (url.match(/^[a-z0-9.-:]+(\/|$)/i)) {
         islink = true;
         href = 'http://' + url;
       }
       return islink ? '<a href="' + Q(href) + '" target="_blank">' + Q(url) + '</a>' : Q(url);
     }
 
     // determine whether the given date is on a weekend
     var is_weekend = function(date)
     {
       return date.getDay() == 0 || date.getDay() == 6;
     };
 
     var is_workinghour = function(date)
     {
       if (settings['work_start'] > settings['work_end'])
         return date.getHours() >= settings['work_start'] || date.getHours() < settings['work_end'];
       else
         return date.getHours() >= settings['work_start'] && date.getHours() < settings['work_end'];
     };
     
     // check if the event has 'real' attendees, excluding the current user
     var has_attendees = function(event)
     {
       return (event.attendees && event.attendees.length && (event.attendees.length > 1 || String(event.attendees[0].email).toLowerCase() != settings.identity.email));
     };
     
     // check if the current user is an attendee of this event
     var is_attendee = function(event, role, email)
     {
       var emails = email ? ';'+email.toLowerCase() : settings.identity.emails;
       for (var i=0; event.attendees && i < event.attendees.length; i++) {
         if ((!role || event.attendees[i].role == role) && event.attendees[i].email && emails.indexOf(';'+event.attendees[i].email.toLowerCase()) >= 0)
           return event.attendees[i];
       }
       return false;
     };
     
     // check if the current user is the organizer
     var is_organizer = function(event, email)
     {
       return is_attendee(event, 'ORGANIZER', email) || !event.id;
     };
 
     /**
      * Check permissions on the given calendar object
      */
     var has_permission = function(cal, perm)
     {
       // multiple chars means "either of"
       if (String(perm).length > 1) {
         for (var i=0; i < perm.length; i++) {
           if (has_permission(cal, perm[i]))
               return true;
         }
       }
 
       if (cal.rights && String(cal.rights).indexOf(perm) >= 0) {
         return true;
       }
 
       return (perm == 'i' && cal.editable) || (perm == 'v' && cal.editable);
     }
 
     var load_attachment = function(event, att)
     {
       var query = { _id: att.id, _event: event.recurrence_id || event.id, _cal:event.calendar, _frame: 1 };
       if (event.rev)
         query._rev = event.rev;
 
       if (event.calendar == "--invitation--itip")
         $.extend(query, {_uid: event._uid, _part: event._part, _mbox: event._mbox});
 
       // open attachment in frame if it's of a supported mimetype
       if (id && att.mimetype && $.inArray(att.mimetype, settings.mimetypes)>=0) {
         if (rcmail.open_window(rcmail.url('get-attachment', query), true, true)) {
           return;
         }
       }
 
       query._frame = null;
       query._download = 1;
       rcmail.goto_url('get-attachment', query, false);
     };
 
     // build event attachments list
     var event_show_attachments = function(list, container, event, edit)
     {
       var i, id, len, img, content, li, elem,
         ul = document.createElement('UL');
       ul.className = 'attachmentslist';
 
       for (i=0, len=list.length; i<len; i++) {
         elem = list[i];
         li = document.createElement('LI');
         li.className = elem.classname;
 
         if (edit) {
           rcmail.env.attachments[elem.id] = elem;
           // delete icon
           content = $('<a href="#delete" />')
             .attr('title', rcmail.gettext('delete'))
             .attr('aria-label', rcmail.gettext('delete') + ' ' + Q(elem.name))
             .addClass('delete')
             .click({id: elem.id}, function(e) { remove_attachment(this, e.data.id); return false; });
 
           if (!rcmail.env.deleteicon)
             content.html(rcmail.gettext('delete'));
           else {
             img = document.createElement('IMG');
             img.src = rcmail.env.deleteicon;
             img.alt = rcmail.gettext('delete');
             content.append(img);
           }
 
           content.appendTo(li);
         }
 
         // name/link
         content = $('<a href="#load" />')
           .html(Q(elem.name))
           .addClass('file')
           .click({event: event, att: elem}, function(e) {
             load_attachment(e.data.event, e.data.att);
             return false;
           })
           .appendTo(li);
 
         ul.appendChild(li);
       }
 
       if (edit && rcmail.gui_objects.attachmentlist) {
         ul.id = rcmail.gui_objects.attachmentlist.id;
         rcmail.gui_objects.attachmentlist = ul;
       }
 
       container.empty().append(ul);
     };
 
     var remove_attachment = function(elem, id)
     {
       $(elem.parentNode).hide();
       rcmail.env.deleted_attachments.push(id);
       delete rcmail.env.attachments[id];
     };
 
     // event details dialog (show only)
     var event_show_dialog = function(event, ev, temp)
     {
       var $dialog = $("#eventshow");
       var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:false, rights:'lrs' };
 
       if (!temp)
         me.selected_event = event;
 
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
 
       // remove status-* and sensitivity-* classes
       $dialog.removeClass(function(i, oldclass) {
           var oldies = String(oldclass).split(' ');
           return $.grep(oldies, function(cls) { return cls.indexOf('status-') === 0 || cls.indexOf('sensitivity-') === 0 }).join(' ');
       });
 
       // convert start/end dates if not done yet by fullcalendar
       if (typeof event.start == 'string')
         event.start = parseISO8601(event.start);
       if (typeof event.end == 'string')
         event.end = parseISO8601(event.end);
 
       // allow other plugins to do actions when event form is opened
       rcmail.triggerEvent('calendar-event-init', {o: event});
 
       $dialog.find('div.event-section, div.event-line').hide();
       $('#event-title').html(Q(event.title)).show();
       
       if (event.location)
         $('#event-location').html('@ ' + text2html(event.location)).show();
       if (event.description)
         $('#event-description').show().children('.event-text').html(text2html(event.description, 300, 6));
       if (event.vurl)
         $('#event-url').show().children('.event-text').html(render_link(event.vurl));
       
       // render from-to in a nice human-readable way
       // -> now shown in dialog title
       // $('#event-date').html(Q(me.event_date_text(event))).show();
       
       if (event.recurrence && event.recurrence_text)
         $('#event-repeat').show().children('.event-text').html(Q(event.recurrence_text));
       
       if (event.valarms && event.alarms_text)
         $('#event-alarm').show().children('.event-text').html(Q(event.alarms_text));
       
       if (calendar.name)
         $('#event-calendar').show().children('.event-text').html(Q(calendar.name)).attr('class', 'event-text cal-'+calendar.id).css('color', calendar.textColor || calendar.color || '');
       if (event.categories)
         $('#event-category').show().children('.event-text').html(Q(event.categories)).attr('class', 'event-text cat-'+String(event.categories).toLowerCase().replace(rcmail.identifier_expr, ''));
       if (event.free_busy)
         $('#event-free-busy').show().children('.event-text').html(Q(rcmail.gettext(event.free_busy, 'calendar')));
       if (event.priority > 0) {
         var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
         $('#event-priority').show().children('.event-text').html(Q(event.priority+' '+priolabels[event.priority]));
       }
 
       if (event.status) {
         var status_lc = String(event.status).toLowerCase();
         $('#event-status').show().children('.event-text').text(rcmail.gettext('status-'+status_lc,'calendar'));
         $('#event-status-badge > span').text(rcmail.gettext('status-'+status_lc,'calendar'));
         $dialog.addClass('status-'+status_lc);
       }
       if (event.sensitivity && event.sensitivity != 'public') {
         $('#event-sensitivity').show().children('.event-text').text(sensitivitylabels[event.sensitivity]);
         $('#event-status-badge > span').text(sensitivitylabels[event.sensitivity]);
         $dialog.addClass('sensitivity-'+event.sensitivity);
       }
       if (event.created || event.changed) {
         var created = parseISO8601(event.created),
           changed = parseISO8601(event.changed)
         $('#event-created-changed .event-created').html(Q(created ? format_datetime(created) : rcmail.gettext('unknown','calendar')))
         $('#event-created-changed .event-changed').html(Q(changed ? format_datetime(changed) : rcmail.gettext('unknown','calendar')))
         $('#event-created-changed').show()
       }
 
       // create attachments list
       if ($.isArray(event.attachments)) {
         event_show_attachments(event.attachments, $('#event-attachments').children('.event-text'), event);
         if (event.attachments.length > 0) {
           $('#event-attachments').show();
         }
       }
       else if (calendar.attachments) {
         // fetch attachments, some drivers doesn't set 'attachments' prop of the event?
       }
 
       // build attachments list
       $('#event-links').hide();
       if ($.isArray(event.links) && event.links.length) {
           render_message_links(event.links || [], $('#event-links').children('.event-text'), false, 'calendar');
           $('#event-links').show();
       }
 
       // list event attendees
       if (calendar.attendees && event.attendees) {
         // sort resources to the end
         event.attendees.sort(function(a,b) {
           var j = a.cutype == 'RESOURCE' ? 1 : 0,
               k = b.cutype == 'RESOURCE' ? 1 : 0;
           return (j - k);
         });
 
         var data, mystatus = null, rsvp, line, morelink, html = '', overflow = '';
         for (var j=0; j < event.attendees.length; j++) {
           data = event.attendees[j];
           if (data.email) {
             if (data.role == 'ORGANIZER')
               organizer = true;
             else if (settings.identity.emails.indexOf(';'+data.email) >= 0) {
               mystatus = data.status.toLowerCase();
               if (data.status == 'NEEDS-ACTION' || data.status == 'TENTATIVE' || data.rsvp)
                 rsvp = mystatus;
             }
           }
 
           line = rcube_libcalendaring.attendee_html(data);
 
           if (morelink)
             overflow += line;
           else
             html += line;
 
           // stop listing attendees
           if (j == 7 && event.attendees.length >= 7) {
             morelink = $('<a href="#more" class="morelink"></a>').html(rcmail.gettext('andnmore', 'calendar').replace('$nr', event.attendees.length - j - 1));
           }
         }
         
         if (html && (event.attendees.length > 1 || !organizer)) {
           $('#event-attendees').show()
             .children('.event-text')
             .html(html)
             .find('a.mailtolink').click(event_attendee_click);
 
           // display all attendees in a popup when clicking the "more" link
           if (morelink) {
             $('#event-attendees .event-text').append(morelink);
             morelink.click(function(e){
               rcmail.show_popup_dialog(
                 '<div id="all-event-attendees" class="event-attendees">' + html + overflow + '</div>',
                 rcmail.gettext('tabattendees','calendar'),
                 null,
                 { width:450, modal:false });
               $('#all-event-attendees a.mailtolink').click(event_attendee_click);
               return false;
             })
           }
         }
 
         if (mystatus && !rsvp) {
           $('#event-partstat').show().children('.changersvp')
             .removeClass('accepted tentative declined delegated needs-action')
             .addClass(mystatus)
             .children('.event-text')
             .text(rcmail.gettext('status' + mystatus, 'libcalendaring'));
         }
 
         var show_rsvp = rsvp && !is_organizer(event) && event.status != 'CANCELLED' && has_permission(calendar, 'v');
         $('#event-rsvp')[(show_rsvp ? 'show' : 'hide')]();
         $('#event-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+mystatus+']').prop('disabled', true);
 
         if (show_rsvp && event.comment)
           $('#event-rsvp-comment').show().children('.event-text').html(Q(event.comment));
 
         $('#event-rsvp a.reply-comment-toggle').show();
         $('#event-rsvp .itip-reply-comment textarea').hide().val('');
 
         if (event.recurrence && event.id) {
           var sel = event._savemode || (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
           $('#event-rsvp .rsvp-buttons').addClass('recurring');
         }
         else {
           $('#event-rsvp .rsvp-buttons').removeClass('recurring');
         }
       }
 
       var buttons = [];
       if (!temp && calendar.editable && event.editable !== false) {
         buttons.push({
           text: rcmail.gettext('edit', 'calendar'),
           click: function() {
             event_edit_dialog('edit', event);
           }
         });
       }
       if (!temp && has_permission(calendar, 'td') && event.editable !== false) {
         buttons.push({
           text: rcmail.gettext('delete', 'calendar'),
           'class': 'delete',
           click: function() {
             me.delete_event(event);
             $dialog.dialog('close');
           }
         });
       }
 
       if (!buttons.length) {
         buttons.push({
           text: rcmail.gettext('close', 'calendar'),
           click: function(){
             $dialog.dialog('close');
           }
         });
       }
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: false,
         resizable: !bw.ie6,
         closeOnEscape: (!bw.ie6 && !bw.ie7),  // disable for performance reasons
         title: me.event_date_text(event),
         open: function() {
           $dialog.attr('aria-hidden', 'false');
           setTimeout(function(){
             $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
           }, 5);
         },
         close: function() {
           $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
           rcmail.command('menu-close','eventoptionsmenu');
           $('.libcal-rsvp-replymode').hide();
         },
         dragStart: function() {
           rcmail.command('menu-close','eventoptionsmenu');
           $('.libcal-rsvp-replymode').hide();
         },
         resizeStart: function() {
           rcmail.command('menu-close','eventoptionsmenu');
           $('.libcal-rsvp-replymode').hide();
         },
         buttons: buttons,
         minWidth: 320,
         width: 420
       }).show();
 
       // remember opener element (to be focused on close)
       $dialog.data('opener', ev && rcube_event.is_keyboard(ev) ? ev.target : null);
 
       // set voice title on dialog widget
       $dialog.dialog('widget').removeAttr('aria-labelledby')
         .attr('aria-label', me.event_date_text(event, true) + ', ', event.title);
 
       // set dialog size according to content
       me.dialog_resize($dialog.get(0), $dialog.height(), 420);
 
       // add link for "more options" drop-down
       if (!temp && !event.temporary && event.calendar != '_resource') {
         $('<a>')
           .attr('href', '#')
           .html(rcmail.gettext('eventoptions','calendar'))
           .addClass('dropdown-link')
           .click(function(e) {
             return rcmail.command('menu-open','eventoptionsmenu', this, e)
           })
           .appendTo($dialog.parent().find('.ui-dialog-buttonset'));
       }
 
       rcmail.enable_command('event-history', calendar.history)
     };
 
     // event handler for clicks on an attendee link
     var event_attendee_click = function(e)
     {
       var cutype = $(this).attr('data-cutype'),
         mailto = this.href.substr(7);
       if (rcmail.env.calendar_resources && cutype == 'RESOURCE') {
         event_resources_dialog(mailto);
       }
       else {
         rcmail.command('compose', mailto, e ? e.target : null, e);
       }
       return false;
     };
 
     // bring up the event dialog (jquery-ui popup)
     var event_edit_dialog = function(action, event)
     {
       // copy opener element from show dialog
       var op_elem = $("#eventshow:ui-dialog").data('opener');
 
       // close show dialog first
       $("#eventshow:ui-dialog").data('opener', null).dialog('close');
 
       var $dialog = $('<div>');
       var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { editable:true, rights: action=='new' ? 'lrwitd' : 'lrs' };
       me.selected_event = $.extend($.extend({}, event_defaults), event);  // clone event object (with defaults)
       event = me.selected_event; // change reference to clone
       freebusy_ui.needsupdate = false;
 
       // reset dialog first
       $('#eventtabs').get(0).reset();
       $('#event-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', false);
       $('#event-panel-recurrence, #event-panel-attachments').removeClass('disabled');
 
       // allow other plugins to do actions when event form is opened
       rcmail.triggerEvent('calendar-event-init', {o: event});
 
       // event details
       var title = $('#edit-title').val(event.title || '');
       var location = $('#edit-location').val(event.location || '');
       var description = $('#edit-description').text(event.description || '');
       var vurl = $('#edit-url').val(event.vurl || '');
       var categories = $('#edit-categories').val(event.categories);
       var calendars = $('#edit-calendar').val(event.calendar);
       var eventstatus = $('#edit-event-status').val(event.status);
       var freebusy = $('#edit-free-busy').val(event.free_busy);
       var priority = $('#edit-priority').val(event.priority);
       var sensitivity = $('#edit-sensitivity').val(event.sensitivity);
       
       var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
       var startdate = $('#edit-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
       var starttime = $('#edit-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
       var enddate = $('#edit-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
       var endtime = $('#edit-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();
       var allday = $('#edit-allday').get(0);
       var notify = $('#edit-attendees-donotify').get(0);
       var invite = $('#edit-attendees-invite').get(0);
       var comment = $('#edit-attendees-comment');
 
       // make sure any calendar is selected
       if (!calendars.val())
         calendars.val($('option:first', calendars).attr('value'));
 
       invite.checked = settings.itip_notify & 1 > 0;
       notify.checked = has_attendees(event) && invite.checked;
 
       if (event.allDay) {
         starttime.val("12:00").hide();
         endtime.val("13:00").hide();
         allday.checked = true;
       }
       else {
         allday.checked = false;
       }
 
       // set calendar selection according to permissions
       calendars.find('option').each(function(i, opt) {
         var cal = me.calendars[opt.value] || {};
         $(opt).prop('disabled', !(cal.editable || (action == 'new' && has_permission(cal, 'i'))))
       });
 
       // set alarm(s)
       me.set_alarms_edit('#edit-alarms', action != 'new' && event.valarms && calendar.alarms ? event.valarms : []);
 
       // enable/disable alarm property according to backend support
       $('#edit-alarms')[(calendar.alarms ? 'show' : 'hide')]();
 
       // check categories drop-down: add value if not exists
       if (event.categories && !categories.find("option[value='"+event.categories+"']").length) {
         $('<option>').attr('value', event.categories).text(event.categories).appendTo(categories).prop('selected', true);
       }
 
       if ($.isArray(event.links) && event.links.length) {
           render_message_links(event.links, $('#edit-event-links .event-text'), true, 'calendar');
           $('#edit-event-links').show();
       }
       else {
           $('#edit-event-links').hide();
       }
 
       // show warning if editing a recurring event
       if (event.id && event.recurrence) {
         var sel = event._savemode || (event.thisandfuture ? 'future' : (event.isexception ? 'current' : 'all'));
         $('#edit-recurring-warning').show();
         $('input.edit-recurring-savemode[value="'+sel+'"]').prop('checked', true).change();
       }
       else
         $('#edit-recurring-warning').hide();
 
       // init attendees tab
       var organizer = !event.attendees || is_organizer(event),
         allow_invitations = organizer || (calendar.owner && calendar.owner == 'anonymous') || settings.invite_shared;
       event_attendees = [];
       attendees_list = $('#edit-attendees-table > tbody').html('');
       resources_list = $('#edit-resources-table > tbody').html('');
       $('#edit-attendees-notify')[(allow_invitations && has_attendees(event) && (settings.itip_notify & 2) ? 'show' : 'hide')]();
       $('#edit-localchanges-warning')[(has_attendees(event) && !(allow_invitations || (calendar.owner && is_organizer(event, calendar.owner))) ? 'show' : 'hide')]();
 
       var load_attendees_tab = function()
       {
         var j, data, reply_selected = 0;
         if (event.attendees) {
           for (j=0; j < event.attendees.length; j++) {
             data = event.attendees[j];
             // reset attendee status
             if (event._savemode == 'new' && data.role != 'ORGANIZER') {
               data.status = 'NEEDS-ACTION';
               delete data.noreply;
             }
             add_attendee(data, !allow_invitations);
             if (allow_invitations && data.role != 'ORGANIZER' && !data.noreply)
               reply_selected++;
           }
         }
 
         // make sure comment box is visible if at least one attendee has reply enabled
         // or global "send invitations" checkbox is checked
         $('#eventedit .attendees-commentbox')[(reply_selected || invite.checked ? 'show' : 'hide')]();
 
         // select the correct organizer identity
         var identity_id = 0;
         $.each(settings.identities, function(i,v){
           if (organizer && typeof organizer == 'object' && v == organizer.email) {
             identity_id = i;
             return false;
           }
         });
         $('#edit-identities-list').val(identity_id);
         $('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
         $('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
       };
 
       // attachments
       var load_attachments_tab = function()
       {
         rcmail.enable_command('remove-attachment', calendar.editable && !event.recurrence_id);
         rcmail.env.deleted_attachments = [];
         // we're sharing some code for uploads handling with app.js
         rcmail.env.attachments = [];
         rcmail.env.compose_id = event.id; // for rcmail.async_upload_form()
 
         if ($.isArray(event.attachments)) {
           event_show_attachments(event.attachments, $('#edit-attachments'), event, true);
         }
         else {
           $('#edit-attachments > ul').empty();
           // fetch attachments, some drivers doesn't set 'attachments' array for event?
         }
       };
       
       // init dialog buttons
       var buttons = [];
       
       // save action
       buttons.push({
         text: rcmail.gettext('save', 'calendar'),
         'class': 'mainaction',
         click: function() {
         var start = parse_datetime(allday.checked ? '12:00' : starttime.val(), startdate.val());
         var end   = parse_datetime(allday.checked ? '13:00' : endtime.val(), enddate.val());
         
         // basic input validatetion
         if (start.getTime() > end.getTime()) {
           alert(rcmail.gettext('invalideventdates', 'calendar'));
           return false;
         }
         
         // post data to server
         var data = {
           calendar: event.calendar,
           start: date2servertime(start),
           end: date2servertime(end),
           allday: allday.checked?1:0,
           title: title.val(),
           description: description.val(),
           location: location.val(),
           categories: categories.val(),
           vurl: vurl.val(),
           free_busy: freebusy.val(),
           priority: priority.val(),
           sensitivity: sensitivity.val(),
           status: eventstatus.val(),
           recurrence: me.serialize_recurrence(endtime.val()),
           valarms: me.serialize_alarms('#edit-alarms'),
           attendees: event_attendees,
           links: me.selected_event.links,
           deleted_attachments: rcmail.env.deleted_attachments,
           attachments: []
         };
 
         // uploaded attachments list
         for (var i in rcmail.env.attachments)
           if (i.match(/^rcmfile(.+)/))
             data.attachments.push(RegExp.$1);
 
         // read attendee roles
         $('select.edit-attendee-role').each(function(i, elem){
           if (data.attendees[i])
             data.attendees[i].role = $(elem).val();
         });
 
         if (organizer)
           data._identity = $('#edit-identities-list option:selected').val();
 
         // per-attendee notification suppression
         var need_invitation = false;
         if (allow_invitations) {
           $.each(data.attendees, function (i, v) {
             if (v.role != 'ORGANIZER') {
               if ($('input.edit-attendee-reply[value="' + v.email + '"]').prop('checked') || v.cutype == 'RESOURCE') {
                 need_invitation = true;
                 delete data.attendees[i]['noreply'];
               }
               else if (settings.itip_notify > 0) {
                 data.attendees[i].noreply = 1;
               }
             }
           });
         }
 
         // tell server to send notifications
         if ((data.attendees.length || (event.id && event.attendees.length)) && allow_invitations && (notify.checked || invite.checked || need_invitation)) {
           data._notify = settings.itip_notify;
           data._comment = comment.val();
         }
 
         data.calendar = calendars.val();
 
         if (event.id) {
           data.id = event.id;
           if (event.recurrence)
             data._savemode = $('input.edit-recurring-savemode:checked').val();
           if (data.calendar && data.calendar != event.calendar)
             data._fromcalendar = event.calendar;
         }
 
         update_event(action, data);
         $dialog.dialog("close");
       }  // end click:
       });
 
       if (event.id) {
         buttons.push({
           text: rcmail.gettext('delete', 'calendar'),
           'class': 'delete',
           click: function() {
             me.delete_event(event);
             $dialog.dialog('close');
           }
         });
       }
 
       buttons.push({
         text: rcmail.gettext('cancel', 'calendar'),
         click: function() {
           $dialog.dialog("close");
         }
       });
 
       // show/hide tabs according to calendar's feature support
       $('#edit-tab-attendees')[(calendar.attendees?'show':'hide')]();
       $('#edit-tab-resources')[(rcmail.env.calendar_resources?'show':'hide')]();
       $('#edit-tab-attachments')[(calendar.attachments?'show':'hide')]();
 
       // activate the first tab
       $('#eventtabs').tabs('option', 'active', 0);
 
       // hack: set task to 'calendar' to make all dialog actions work correctly
       var comm_path_before = rcmail.env.comm_path;
       rcmail.env.comm_path = comm_path_before.replace(/_task=[a-z]+/, '_task=calendar');
 
       var editform = $("#eventedit");
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: (!bw.ie6 && !bw.ie7),  // disable for performance reasons
         closeOnEscape: false,
         title: rcmail.gettext((action == 'edit' ? 'edit_event' : 'new_event'), 'calendar'),
         open: function() {
           editform.attr('aria-hidden', 'false');
         },
         close: function() {
           editform.hide().attr('aria-hidden', 'true').appendTo(document.body);
           $dialog.dialog("destroy").remove();
           rcmail.ksearch_blur();
           freebusy_data = {};
           rcmail.env.comm_path = comm_path_before;  // restore comm_path
           if (op_elem)
             $(op_elem).focus();
         },
         buttons: buttons,
         minWidth: 500,
         width: 600
       }).append(editform.show());  // adding form content AFTERWARDS massively speeds up opening on IE6
 
       // set dialog size according to form content
       me.dialog_resize($dialog.get(0), editform.height() + (bw.ie ? 20 : 0), 550);
 
       title.select();
 
       // init other tabs asynchronously
       window.setTimeout(function(){ me.set_recurrence_edit(event); }, exec_deferred);
       if (calendar.attendees)
         window.setTimeout(load_attendees_tab, exec_deferred);
       if (calendar.attachments)
         window.setTimeout(load_attachments_tab, exec_deferred);
     };
 
     // show event changelog in a dialog
     var event_history_dialog = function(event)
     {
       if (!event.id || !window.libkolab_audittrail)
         return false
 
       // render dialog
       var $dialog = libkolab_audittrail.object_history_dialog({
         module: 'calendar',
         container: '#eventhistory',
         title: rcmail.gettext('objectchangelog','calendar') + ' - ' + event.title + ', ' + me.event_date_text(event),
 
         // callback function for list actions
         listfunc: function(action, rev) {
           me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
           rcmail.http_post('event', { action:action, e:{ id:event.id, calendar:event.calendar, rev: rev } }, me.loading_lock);
         },
 
         // callback function for comparing two object revisions
         comparefunc: function(rev1, rev2) {
           me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
           rcmail.http_post('event', { action:'diff', e:{ id:event.id, calendar:event.calendar, rev1: rev1, rev2: rev2 } }, me.loading_lock);
         }
       });
 
       $dialog.data('event', event);
 
       // fetch changelog data
       me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
       rcmail.http_post('event', { action:'changelog', e:{ id:event.id, calendar:event.calendar } }, me.loading_lock);
     };
 
     // callback from server with changelog data
     var render_event_changelog = function(data)
     {
       var $dialog = $('#eventhistory'),
         event = $dialog.data('event');
 
       if (data === false || !data.length || !event) {
         // display 'unavailable' message
         $('<div class="notfound-message event-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','calendar') + '</div>')
           .insertBefore($dialog.find('.changelog-table').hide());
         return;
       }
 
       data.module = 'calendar';
       libkolab_audittrail.render_changelog(data, event, me.calendars[event.calendar]);
 
       // set dialog size according to content
       me.dialog_resize($dialog.get(0), $dialog.height(), 600);
     };
 
     // callback from server with event diff data
     var event_show_diff = function(data)
     {
       var event = me.selected_event,
         $dialog = $("#eventdiff");
 
       $dialog.find('div.event-section, div.event-line, h1.event-title-new').hide().data('set', false).find('.index').html('');
       $dialog.find('div.event-section.clone, div.event-line.clone').remove();
 
       // always show event title and date
       $('.event-title', $dialog).text(event.title).removeClass('event-text-old').show();
       $('.event-date', $dialog).text(me.event_date_text(event)).show();
 
       // show each property change
       $.each(data.changes, function(i,change) {
         var prop = change.property, r2, html = false,
           row = $('div.event-' + prop, $dialog).first();
 
           // special case: title
           if (prop == 'title') {
             $('.event-title', $dialog).addClass('event-text-old').text(change['old'] || '--');
             $('.event-title-new', $dialog).text(change['new'] || '--').show();
           }
 
           // no display container for this property
           if (!row.length) {
             return true;
           }
 
           // clone row if already exists
           if (row.data('set')) {
             r2 = row.clone().addClass('clone').insertAfter(row);
             row = r2;
           }
 
           // format dates
           if (['start','end','changed'].indexOf(prop) >= 0) {
             if (change['old']) change.old_ = me.format_datetime(parseISO8601(change['old']));
             if (change['new']) change.new_ = me.format_datetime(parseISO8601(change['new']));
           }
           // render description text
           else if (prop == 'description') {
             // TODO: show real text diff
             if (!change.diff_ && change['old']) change.old_ = text2html(change['old']);
             if (!change.diff_ && change['new']) change.new_ = text2html(change['new']);
             html = true;
           }
           // format attendees struct
           else if (prop == 'attendees') {
             if (change['old']) change.old_ = rcube_libcalendaring.attendee_html(change['old']);
             if (change['new']) change.new_ = rcube_libcalendaring.attendee_html($.extend({}, change['old'] || {}, change['new']));
             html = true;
           }
           // localize priority values
           else if (prop == 'priority') {
             var priolabels = [ '', rcmail.gettext('highest'), rcmail.gettext('high'), '', '', rcmail.gettext('normal'), '', '', rcmail.gettext('low'), rcmail.gettext('lowest') ];
             if (change['old']) change.old_ = change['old'] + ' ' + (priolabels[change['old']] || '');
             if (change['new']) change.new_ = change['new'] + ' ' + (priolabels[change['new']] || '');
           }
           // localize status
           else if (prop == 'status') {
             var status_lc = String(event.status).toLowerCase();
             if (change['old']) change.old_ = rcmail.gettext(String(change['old']).toLowerCase(), 'calendar');
             if (change['new']) change.new_ = rcmail.gettext(String(change['new']).toLowerCase(), 'calendar');
           }
 
           // format attachments struct
           if (prop == 'attachments') {
             if (change['old']) event_show_attachments([change['old']], row.children('.event-text-old'), event, false);
             else            row.children('.event-text-old').text('--');
             if (change['new']) event_show_attachments([$.extend({}, change['old'] || {}, change['new'])], row.children('.event-text-new'), event, false);
             else            row.children('.event-text-new').text('--');
             // remove click handler as we're currentyl not able to display the according attachment contents
             $('.attachmentslist li a', row).unbind('click').removeAttr('href');
           }
           else if (change.diff_) {
             row.children('.event-text-diff').html(change.diff_);
             row.children('.event-text-old, .event-text-new').hide();
           }
           else {
             if (!html) {
               // escape HTML characters
               change.old_ = Q(change.old_ || change['old'] || '--')
               change.new_ = Q(change.new_ || change['new'] || '--')
             }
             row.children('.event-text-old').html(change.old_ || change['old'] || '--');
             row.children('.event-text-new').html(change.new_ || change['new'] || '--');
           }
 
           // display index number
           if (typeof change.index != 'undefined') {
             row.find('.index').html('(' + change.index + ')');
           }
 
           row.show().data('set', true);
 
           // hide event-date line
           if (prop == 'start' || prop == 'end')
             $('.event-date', $dialog).hide();
       });
 
       var buttons = {};
       buttons[rcmail.gettext('close', 'calendar')] = function() {
         $dialog.dialog('close');
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: false,
         resizable: true,
         closeOnEscape: true,
         title: rcmail.gettext('objectdiff','calendar').replace('$rev1', data.rev1).replace('$rev2', data.rev2) + ' - ' + event.title,
         open: function() {
           $dialog.attr('aria-hidden', 'false');
           setTimeout(function(){
             $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
           }, 5);
         },
         close: function() {
           $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
         },
         buttons: buttons,
         minWidth: 320,
         width: 450
       }).show();
 
       // set dialog size according to content
       me.dialog_resize($dialog.get(0), $dialog.height(), 400);
     };
 
     // close the event history dialog
     var close_history_dialog = function()
     {
       $('#eventhistory, #eventdiff').each(function(i, elem) {
         var $dialog = $(elem);
         if ($dialog.is(':ui-dialog'))
           $dialog.dialog('close');
       });
     }
 
     // exports
     this.event_show_diff = event_show_diff;
     this.event_show_dialog = event_show_dialog;
     this.event_history_dialog = event_history_dialog;
     this.render_event_changelog = render_event_changelog;
     this.close_history_dialog = close_history_dialog;
 
     // open a dialog to display detailed free-busy information and to find free slots
     var event_freebusy_dialog = function()
     {
       var $dialog = $('#eventfreebusy'),
         event = me.selected_event;
       
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
       
       if (!event_attendees.length)
         return false;
       
       // set form elements
       var allday = $('#edit-allday').get(0);
       var duration = Math.round((event.end.getTime() - event.start.getTime()) / 1000);
       freebusy_ui.startdate = $('#schedule-startdate').val($.fullCalendar.formatDate(event.start, settings['date_format'])).data('duration', duration);
       freebusy_ui.starttime = $('#schedule-starttime').val($.fullCalendar.formatDate(event.start, settings['time_format'])).show();
       freebusy_ui.enddate = $('#schedule-enddate').val($.fullCalendar.formatDate(event.end, settings['date_format']));
       freebusy_ui.endtime = $('#schedule-endtime').val($.fullCalendar.formatDate(event.end, settings['time_format'])).show();
       
       if (allday.checked) {
         freebusy_ui.starttime.val("12:00").hide();
         freebusy_ui.endtime.val("13:00").hide();
         event.allDay = true;
       }
       
       // read attendee roles from drop-downs
       $('select.edit-attendee-role').each(function(i, elem){
         if (event_attendees[i])
           event_attendees[i].role = $(elem).val();
       });
       
       // render time slots
       var now = new Date(), fb_start = new Date(), fb_end = new Date();
       fb_start.setTime(event.start);
       fb_start.setHours(0); fb_start.setMinutes(0); fb_start.setSeconds(0); fb_start.setMilliseconds(0);
       fb_end.setTime(fb_start.getTime() + DAY_MS);
       
       freebusy_data = { required:{}, all:{} };
       freebusy_ui.loading = 1;  // prevent render_freebusy_grid() to load data yet
       freebusy_ui.numdays = Math.max(allday.checked ? 14 : 1, Math.ceil(duration * 2 / 86400));
       freebusy_ui.interval = allday.checked ? 1440 : (60 / (settings.timeslots || 1));
       freebusy_ui.start = fb_start;
       freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
       render_freebusy_grid(0);
       
       // render list of attendees
       freebusy_ui.attendees = {};
       var domid, dispname, data, role_html, list_html = '';
       for (var i=0; i < event_attendees.length; i++) {
         data = event_attendees[i];
         dispname = Q(data.name || data.email);
         domid = String(data.email).replace(rcmail.identifier_expr, '');
         role_html = '<a class="attendee-role-toggle" id="rcmlia' + domid + '" title="' + Q(rcmail.gettext('togglerole', 'calendar')) + '">&nbsp;</a>';
         list_html += '<div class="attendee ' + String(data.role).toLowerCase() + '" id="rcmli' + domid + '">' + role_html + dispname + '</div>';
         
         // clone attendees data for local modifications
         freebusy_ui.attendees[i] = freebusy_ui.attendees[domid] = $.extend({}, data);
       }
       
       // add total row
       list_html += '<div class="attendee spacer">&nbsp;</div>';
       list_html += '<div class="attendee total">' + rcmail.gettext('reqallattendees','calendar') + '</div>';
       
       $('#schedule-attendees-list').html(list_html)
         .unbind('click.roleicons')
         .bind('click.roleicons', function(e){
           // toggle attendee status upon click on icon
           if (e.target.id && e.target.id.match(/rcmlia(.+)/)) {
             var attendee, domid = RegExp.$1,
                 roles = [ 'REQ-PARTICIPANT', 'OPT-PARTICIPANT', 'NON-PARTICIPANT', 'CHAIR' ];
             if ((attendee = freebusy_ui.attendees[domid]) && attendee.role != 'ORGANIZER') {
               var req = attendee.role != 'OPT-PARTICIPANT' && attendee.role != 'NON-PARTICIPANT';
               var j = $.inArray(attendee.role, roles);
               j = (j+1) % roles.length;
               attendee.role = roles[j];
               $(e.target).parent().attr('class', 'attendee '+String(attendee.role).toLowerCase());
               
               // update total display if required-status changed
               if (req != (roles[j] != 'OPT-PARTICIPANT' && roles[j] != 'NON-PARTICIPANT')) {
                 compute_freebusy_totals();
                 update_freebusy_display(attendee.email);
               }
             }
           }
           
           return false;
         });
       
       // enable/disable buttons
       $('#shedule-find-prev').button('option', 'disabled', (fb_start.getTime() < now.getTime()));
       
       // dialog buttons
       var buttons = {};
       
       buttons[rcmail.gettext('select', 'calendar')] = function() {
         $('#edit-startdate').val(freebusy_ui.startdate.val());
         $('#edit-starttime').val(freebusy_ui.starttime.val());
         $('#edit-enddate').val(freebusy_ui.enddate.val());
         $('#edit-endtime').val(freebusy_ui.endtime.val());
         
         // write role changes back to main dialog
         $('select.edit-attendee-role').each(function(i, elem){
           if (event_attendees[i] && freebusy_ui.attendees[i]) {
             event_attendees[i].role = freebusy_ui.attendees[i].role;
             $(elem).val(event_attendees[i].role);
           }
         });
         
         if (freebusy_ui.needsupdate)
           update_freebusy_status(me.selected_event);
         freebusy_ui.needsupdate = false;
         $dialog.dialog("close");
       };
       
       buttons[rcmail.gettext('cancel', 'calendar')] = function() {
         $dialog.dialog("close");
       };
       
       $dialog.dialog({
         modal: true,
         resizable: true,
         closeOnEscape: (!bw.ie6 && !bw.ie7),
         title: rcmail.gettext('scheduletime', 'calendar'),
         open: function() {
           rcmail.ksearch_blur();
           $dialog.attr('aria-hidden', 'false').find('#shedule-find-next, #shedule-find-prev').not(':disabled').first().focus();
         },
         close: function() {
           if (bw.ie6)
             $("#edit-attendees-table").css('visibility','visible');
           $dialog.dialog("destroy").attr('aria-hidden', 'true').hide();
           // TODO: focus opener button
         },
         resizeStop: function() {
           render_freebusy_overlay();
         },
         buttons: buttons,
         minWidth: 640,
         width: 850
       }).show();
       
       // hide edit dialog on IE6 because of drop-down elements
       if (bw.ie6)
         $("#edit-attendees-table").css('visibility','hidden');
       
       // adjust dialog size to fit grid without scrolling
       var gridw = $('#schedule-freebusy-times').width();
       var overflow = gridw - $('#attendees-freebusy-table td.times').width();
       me.dialog_resize($dialog.get(0), $dialog.height() + (bw.ie ? 20 : 0), 800 + Math.max(0, overflow));
       
       // fetch data from server
       freebusy_ui.loading = 0;
       load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
     };
 
     // render an HTML table showing free-busy status for all the event attendees
     var render_freebusy_grid = function(delta)
     {
       if (delta) {
         freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
         fix_date(freebusy_ui.start);
         
         // skip weekends if in workinhoursonly-mode
         if (Math.abs(delta) == 1 && freebusy_ui.workinhoursonly) {
           while (is_weekend(freebusy_ui.start))
             freebusy_ui.start.setTime(freebusy_ui.start.getTime() + DAY_MS * delta);
           fix_date(freebusy_ui.start);
         }
         
         freebusy_ui.end = new Date(freebusy_ui.start.getTime() + DAY_MS * freebusy_ui.numdays);
       }
       
       var dayslots = Math.floor(1440 / freebusy_ui.interval);
       var date_format = 'ddd '+ (dayslots <= 2 ? settings.date_short : settings.date_format);
       var lastdate, datestr, css,
         curdate = new Date(),
         allday = (freebusy_ui.interval == 1440),
         interval = allday ? 1440 : (freebusy_ui.interval * (settings.timeslots || 1));
         times_css = (allday ? 'allday ' : ''),
         dates_row = '<tr class="dates">',
         times_row = '<tr class="times">',
         slots_row = '';
 
       for (var s = 0, t = freebusy_ui.start.getTime(); t < freebusy_ui.end.getTime(); s++) {
         curdate.setTime(t);
         datestr = fc.fullCalendar('formatDate', curdate, date_format);
         if (datestr != lastdate) {
           if (lastdate && !allday) break;
           dates_row += '<th colspan="' + dayslots + '" class="boxtitle date' + $.fullCalendar.formatDate(curdate, 'ddMMyyyy') + '">' + Q(datestr) + '</th>';
           lastdate = datestr;
         }
         
         // set css class according to working hours
         css = is_weekend(curdate) || (freebusy_ui.interval <= 60 && !is_workinghour(curdate)) ? 'offhours' : 'workinghours';
         times_row += '<td class="' + times_css + css + '" id="t-' + Math.floor(t/1000) + '">' + Q(allday ? rcmail.gettext('all-day','calendar') : $.fullCalendar.formatDate(curdate, settings['time_format'])) + '</td>';
         slots_row += '<td class="' + css + '">&nbsp;</td>';
         
         t += interval * 60000;
       }
       dates_row += '</tr>';
       times_row += '</tr>';
       
       // render list of attendees
       var domid, data, list_html = '', times_html = '';
       for (var i=0; i < event_attendees.length; i++) {
         data = event_attendees[i];
         domid = String(data.email).replace(rcmail.identifier_expr, '');
         times_html += '<tr id="fbrow' + domid + '">' + slots_row + '</tr>';
       }
       
       // add line for all/required attendees
       times_html += '<tr class="spacer"><td colspan="' + (dayslots * freebusy_ui.numdays) + '"></td>';
       times_html += '<tr id="fbrowall">' + slots_row + '</tr>';
       
       var table = $('#schedule-freebusy-times');
       table.children('thead').html(dates_row + times_row);
       table.children('tbody').html(times_html);
       
       // initialize event handlers on grid
       if (!freebusy_ui.grid_events) {
         freebusy_ui.grid_events = true;
         table.children('thead').click(function(e){
           // move event to the clicked date/time
           if (e.target.id && e.target.id.match(/t-(\d+)/)) {
             var newstart = new Date(RegExp.$1 * 1000);
             // set time to 00:00
             if (me.selected_event.allDay) {
               newstart.setMinutes(0);
               newstart.setHours(0);
             }
             update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
             render_freebusy_overlay();
           }
         });
       }
       
       // if we have loaded free-busy data, show it
       if (!freebusy_ui.loading) {
         if (freebusy_ui.start < freebusy_data.start || freebusy_ui.end > freebusy_data.end || freebusy_ui.interval != freebusy_data.interval) {
           load_freebusy_data(freebusy_ui.start, freebusy_ui.interval);
         }
         else {
           for (var email, i=0; i < event_attendees.length; i++) {
             if ((email = event_attendees[i].email))
               update_freebusy_display(email);
           }
         }
       }
       
       // render current event date/time selection over grid table
       // use timeout to let the dom attributes (width/height/offset) be set first
       window.setTimeout(function(){ render_freebusy_overlay(); }, 10);
     };
     
     // render overlay element over the grid to visiualize the current event date/time
     var render_freebusy_overlay = function()
     {
       var overlay = $('#schedule-event-time');
       if (me.selected_event.end.getTime() <= freebusy_ui.start.getTime() || me.selected_event.start.getTime() >= freebusy_ui.end.getTime()) {
         overlay.hide();
         if (overlay.data('isdraggable'))
           overlay.draggable('disable');
       }
       else {
         var i, n, table = $('#schedule-freebusy-times'),
           width = 0,
           pos = { top:table.children('thead').height(), left:0 },
           eventstart = date2unixtime(clone_date(me.selected_event.start, me.selected_event.allDay?1:0)),
           eventend = date2unixtime(clone_date(me.selected_event.end, me.selected_event.allDay?2:0)) - 60,
           slotstart = date2unixtime(freebusy_ui.start),
           slotsize = freebusy_ui.interval * 60,
           slotnum = freebusy_ui.interval > 60 ? 1 : (60 / freebusy_ui.interval),
           cells = table.children('thead').find('td'),
           cell_width = cells.first().get(0).offsetWidth,
           slotend;
 
         // iterate through slots to determine position and size of the overlay
         for (i=0; i < cells.length; i++) {
           for (n=0; n < slotnum; n++) {
             slotend = slotstart + slotsize - 1;
             // event starts in this slot: compute left
             if (eventstart >= slotstart && eventstart <= slotend) {
               pos.left = Math.round(i * cell_width + (cell_width / slotnum) * n);
             }
             // event ends in this slot: compute width
             if (eventend >= slotstart && eventend <= slotend) {
               width = Math.round(i * cell_width + (cell_width / slotnum) * (n + 1)) - pos.left;
             }
             slotstart += slotsize;
           }
         }
 
         if (!width)
           width = table.width() - pos.left;
 
         // overlay is visible
         if (width > 0) {
           overlay.css({ width: (width-4)+'px', height:(table.children('tbody').height() - 4)+'px', left:pos.left+'px', top:pos.top+'px' }).show();
           
           // configure draggable
           if (!overlay.data('isdraggable')) {
             overlay.draggable({
               axis: 'x',
               scroll: true,
               stop: function(e, ui){
                 // convert pixels to time
                 var px = ui.position.left;
                 var range_p = $('#schedule-freebusy-times').width();
                 var range_t = freebusy_ui.end.getTime() - freebusy_ui.start.getTime();
                 var newstart = new Date(freebusy_ui.start.getTime() + px * (range_t / range_p));
                 newstart.setSeconds(0); newstart.setMilliseconds(0);
                 // snap to day boundaries
                 if (me.selected_event.allDay) {
                   if (newstart.getHours() >= 12)  // snap to next day
                     newstart.setTime(newstart.getTime() + DAY_MS);
                   newstart.setMinutes(0);
                   newstart.setHours(0);
                 }
                 else {
                   // round to 5 minutes
                   // @TODO: round to timeslots?
                   var round = newstart.getMinutes() % 5;
                   if (round > 2.5) newstart.setTime(newstart.getTime() + (5 - round) * 60000);
                   else if (round > 0) newstart.setTime(newstart.getTime() - round * 60000);
                 }
                 // update event times and display
                 update_freebusy_dates(newstart, new Date(newstart.getTime() + freebusy_ui.startdate.data('duration') * 1000));
                 if (me.selected_event.allDay)
                   render_freebusy_overlay();
               }
             }).data('isdraggable', true);
           }
           else
             overlay.draggable('enable');
         }
         else
           overlay.draggable('disable').hide();
       }
     };
 
     // fetch free-busy information for each attendee from server
     var load_freebusy_data = function(from, interval)
     {
       var start = new Date(from.getTime() - DAY_MS * 2);  // start 2 days before event
       fix_date(start);
       var end = new Date(start.getTime() + DAY_MS * Math.max(14, freebusy_ui.numdays + 7));   // load min. 14 days
       freebusy_ui.numrequired = 0;
       freebusy_data.all = [];
       freebusy_data.required = [];
 
       // load free-busy information for every attendee
       var domid, email;
       for (var i=0; i < event_attendees.length; i++) {
         if ((email = event_attendees[i].email)) {
           domid = String(email).replace(rcmail.identifier_expr, '');
           $('#rcmli' + domid).addClass('loading');
           freebusy_ui.loading++;
           
           $.ajax({
             type: 'GET',
             dataType: 'json',
             url: rcmail.url('freebusy-times'),
             data: { email:email, start:date2servertime(clone_date(start, 1)), end:date2servertime(clone_date(end, 2)), interval:interval, _remote:1 },
             success: function(data) {
               freebusy_ui.loading--;
               
               // find attendee
               var i, attendee = null;
               for (i=0; i < event_attendees.length; i++) {
                 if (freebusy_ui.attendees[i].email == data.email) {
                   attendee = freebusy_ui.attendees[i];
                   break;
                 }
               }
               
               // copy data to member var
               var ts, status,
                 req = attendee.role != 'OPT-PARTICIPANT',
                 start = parseISO8601(data.start);
 
               freebusy_data.start = new Date(start);
               freebusy_data.end = parseISO8601(data.end);
               freebusy_data.interval = data.interval;
               freebusy_data[data.email] = {};
 
               for (i=0; i < data.slots.length; i++) {
                 ts = date2timestring(start, data.interval > 60);
                 status = data.slots.charAt(i);
                 freebusy_data[data.email][ts] = status
                 start = new Date(start.getTime() + data.interval * 60000);
                 
                 // set totals
                 if (!freebusy_data.required[ts])
                   freebusy_data.required[ts] = [0,0,0,0];
                 if (req)
                   freebusy_data.required[ts][status]++;
                 
                 if (!freebusy_data.all[ts])
                   freebusy_data.all[ts] = [0,0,0,0];
                 freebusy_data.all[ts][status]++;
               }
 
               // hide loading indicator
               var domid = String(data.email).replace(rcmail.identifier_expr, '');
               $('#rcmli' + domid).removeClass('loading');
               
               // update display
               update_freebusy_display(data.email);
             }
           });
           
           // count required attendees
           if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT')
             freebusy_ui.numrequired++;
         }
       }
     };
     
     // re-calculate total status after role change
     var compute_freebusy_totals = function()
     {
       freebusy_ui.numrequired = 0;
       freebusy_data.all = [];
       freebusy_data.required = [];
       
       var email, req, status;
       for (var i=0; i < event_attendees.length; i++) {
         if (!(email = event_attendees[i].email))
           continue;
         
         req = freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT';
         if (req)
           freebusy_ui.numrequired++;
         
         for (var ts in freebusy_data[email]) {
           if (!freebusy_data.required[ts])
             freebusy_data.required[ts] = [0,0,0,0];
           if (!freebusy_data.all[ts])
             freebusy_data.all[ts] = [0,0,0,0];
           
           status = freebusy_data[email][ts];
           freebusy_data.all[ts][status]++;
           
           if (req)
             freebusy_data.required[ts][status]++;
         }
       }
     };
 
     // update free-busy grid with status loaded from server
     var update_freebusy_display = function(email)
     {
       var status_classes = ['unknown','free','busy','tentative','out-of-office'];
       var domid = String(email).replace(rcmail.identifier_expr, '');
       var row = $('#fbrow' + domid);
       var rowall = $('#fbrowall').children();
       var dateonly = freebusy_ui.interval > 60,
         t, ts = date2timestring(freebusy_ui.start, dateonly),
         curdate = new Date(),
         fbdata = freebusy_data[email];
 
       if (fbdata && fbdata[ts] !== undefined && row.length) {
         t = freebusy_ui.start.getTime();
         row.children().each(function(i, cell) {
           var j, n, attr, last, all_slots = [], slots = [],
             all_cell = rowall.get(i),
             cnt = dateonly ? 1 : (60 / freebusy_ui.interval),
             percent = (100 / cnt);
 
           for (n=0; n < cnt; n++) {
             curdate.setTime(t);
             ts = date2timestring(curdate, dateonly);
             attr = {
               'style': 'float:left; width:' + percent.toFixed(2) + '%',
               'class': fbdata[ts] ? status_classes[fbdata[ts]] : 'unknown'
             };
 
             slots.push($('<div>').attr(attr));
 
             // also update total row if all data was loaded
             if (!freebusy_ui.loading && freebusy_data.all[ts] && all_cell) {
               var all_status = freebusy_data.all[ts][2] ? 'busy' : 'unknown',
                 req_status = freebusy_data.required[ts][2] ? 'busy' : 'free';
 
               for (j=1; j < status_classes.length; j++) {
                 if (freebusy_ui.numrequired && freebusy_data.required[ts][j] >= freebusy_ui.numrequired)
                   req_status = status_classes[j];
                 if (freebusy_data.all[ts][j] == event_attendees.length)
                   all_status = status_classes[j];
               }
 
               attr['class'] = req_status + ' all-' + all_status;
 
               // these elements use some specific styling, so we want to minimize their number
               if (last && last.attr('class') == attr['class'])
                 last.css('width', (percent + parseFloat(last.css('width').replace('%', ''))).toFixed(2) + '%');
               else {
                 last = $('<div>').attr(attr);
                 all_slots.push(last);
               }
             }
 
             t += freebusy_ui.interval * 60000;
           }
 
           $(cell).html('').append(slots);
           if (all_slots.length)
             $(all_cell).html('').append(all_slots);
         });
       }
     };
     
     // write changed event date/times back to form fields
     var update_freebusy_dates = function(start, end)
     {
       // fix all-day evebt times
       if (me.selected_event.allDay) {
         var numdays = Math.floor((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / DAY_MS);
         start.setHours(12);
         start.setMinutes(0);
         end.setTime(start.getTime() + numdays * DAY_MS);
         end.setHours(13);
         end.setMinutes(0);
       }
       me.selected_event.start = start;
       me.selected_event.end = end;
       freebusy_ui.startdate.val($.fullCalendar.formatDate(start, settings['date_format']));
       freebusy_ui.starttime.val($.fullCalendar.formatDate(start, settings['time_format']));
       freebusy_ui.enddate.val($.fullCalendar.formatDate(end, settings['date_format']));
       freebusy_ui.endtime.val($.fullCalendar.formatDate(end, settings['time_format']));
       freebusy_ui.needsupdate = true;
     };
 
     // attempt to find a time slot where all attemdees are available
     var freebusy_find_slot = function(dir)
     {
       // exit if free-busy data isn't available yet
       if (!freebusy_data || !freebusy_data.start)
         return false;
 
       var event = me.selected_event,
         eventstart = clone_date(event.start, event.allDay ? 1 : 0).getTime(),  // calculate with integers
         eventend = clone_date(event.end, event.allDay ? 2 : 0).getTime(),
         duration = eventend - eventstart - (event.allDay ? HOUR_MS : 0),  /* make sure we don't cross day borders on DST change */
         sinterval = freebusy_data.interval * 60000,
         intvlslots = 1,
         numslots = Math.ceil(duration / sinterval),
         fb_start = freebusy_data.start.getTime(),
         fb_end = freebusy_data.end.getTime(),
         checkdate, slotend, email, ts, slot, slotdate = new Date(),
         candidatecount = 0, candidatestart = false, success = false;
 
       // shift event times to next possible slot
       eventstart += sinterval * intvlslots * dir;
       eventend += sinterval * intvlslots * dir;
 
       // iterate through free-busy slots and find candidates
       for (slot = dir > 0 ? fb_start : fb_end - sinterval;
             (dir > 0 && slot < fb_end) || (dir < 0 && slot >= fb_start);
             slot += sinterval * dir
       ) {
         slotdate.setTime(slot);
         // fix slot if just crossed a DST change
         if (event.allDay) {
           fix_date(slotdate);
           slot = slotdate.getTime();
         }
         slotend = slot + sinterval;
 
         if ((dir > 0 && slotend <= eventstart) || (dir < 0 && slot >= eventend))  // skip
           continue;
 
         // respect workinghours setting
         if (freebusy_ui.workinhoursonly) {
           if (is_weekend(slotdate) || (freebusy_data.interval <= 60 && !is_workinghour(slotdate))) {  // skip off-hours
             candidatestart = false;
             candidatecount = 0;
             continue;
           }
         }
 
         if (!candidatestart)
           candidatestart = slot;
 
         ts = date2timestring(slotdate, freebusy_data.interval > 60);
 
         // check freebusy data for all attendees
         for (var i=0; i < event_attendees.length; i++) {
           if (freebusy_ui.attendees[i].role != 'OPT-PARTICIPANT' && (email = freebusy_ui.attendees[i].email) && freebusy_data[email] && freebusy_data[email][ts] > 1) {
             candidatestart = false;
             break;
           }
         }
         
         // occupied slot
         if (!candidatestart) {
           slot += Math.max(0, intvlslots - candidatecount - 1) * sinterval * dir;
           candidatecount = 0;
           continue;
         }
         else if (dir < 0)
           candidatestart = slot;
         
         candidatecount++;
         
         // if candidate is big enough, this is it!
         if (candidatecount == numslots) {
           event.start.setTime(candidatestart);
           event.end.setTime(candidatestart + duration);
           success = true;
           break;
         }
       }
       
       // update event date/time display
       if (success) {
         update_freebusy_dates(event.start, event.end);
         
         // move freebusy grid if necessary
         var offset = Math.ceil((event.start.getTime() - freebusy_ui.end.getTime()) / DAY_MS);
         if (event.start.getTime() >= freebusy_ui.end.getTime())
           render_freebusy_grid(Math.max(1, offset));
         else if (event.end.getTime() <= freebusy_ui.start.getTime())
           render_freebusy_grid(Math.min(-1, offset));
         else
           render_freebusy_overlay();
         
         var now = new Date();
         $('#shedule-find-prev').button('option', 'disabled', (event.start.getTime() < now.getTime()));
         
         // speak new selection
         rcmail.display_message(rcmail.gettext('suggestedslot', 'calendar') + ': ' + me.event_date_text(event, true), 'voice');
       }
       else {
         alert(rcmail.gettext('noslotfound','calendar'));
       }
     };
 
     // update event properties and attendees availability if event times have changed
     var event_times_changed = function()
     {
       if (me.selected_event) {
         var allday = $('#edit-allday').get(0);
         me.selected_event.allDay = allday.checked;
         me.selected_event.start = parse_datetime(allday.checked ? '12:00' : $('#edit-starttime').val(), $('#edit-startdate').val());
         me.selected_event.end   = parse_datetime(allday.checked ? '13:00' : $('#edit-endtime').val(), $('#edit-enddate').val());
         if (event_attendees)
           freebusy_ui.needsupdate = true;
         $('#edit-startdate').data('duration', Math.round((me.selected_event.end.getTime() - me.selected_event.start.getTime()) / 1000));
       }
     };
 
     // add the given list of participants
     var add_attendees = function(names, params)
     {
       names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');
 
       // parse name/email pairs
       var item, email, name, success = false;
       for (var i=0; i < names.length; i++) {
         email = name = '';
         item = $.trim(names[i]);
         
         if (!item.length) {
           continue;
         } // address in brackets without name (do nothing)
         else if (item.match(/^<[^@]+@[^>]+>$/)) {
           email = item.replace(/[<>]/g, '');
         } // address without brackets and without name (add brackets)
         else if (rcube_check_email(item)) {
           email = item;
         } // address with name
         else if (item.match(/([^\s<@]+@[^>]+)>*$/)) {
           email = RegExp.$1;
           name = item.replace(email, '').replace(/^["\s<>]+/, '').replace(/["\s<>]+$/, '');
         }
         if (email) {
           add_attendee($.extend({ email:email, name:name }, params));
           success = true;
         }
         else {
           alert(rcmail.gettext('noemailwarning'));
         }
       }
       
       return success;
     };
 
     // add the given attendee to the list
     var add_attendee = function(data, readonly, before)
     {
       if (!me.selected_event)
         return false;
 
       // check for dupes...
       var exists = false;
       $.each(event_attendees, function(i, v){ exists |= (v.email == data.email); });
       if (exists)
         return false;
       
       var calendar = me.selected_event && me.calendars[me.selected_event.calendar] ? me.calendars[me.selected_event.calendar] : me.calendars[me.selected_calendar];
 
       var dispname = Q(data.name || data.email);
       if (data.email)
         dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink" data-cutype="' + data.cutype + '">' + dispname + '</a>';
       
       // role selection
       var organizer = data.role == 'ORGANIZER';
       var opts = {};
       if (organizer)
         opts.ORGANIZER = rcmail.gettext('calendar.roleorganizer');
       opts['REQ-PARTICIPANT'] = rcmail.gettext('calendar.rolerequired');
       opts['OPT-PARTICIPANT'] = rcmail.gettext('calendar.roleoptional');
       opts['NON-PARTICIPANT'] = rcmail.gettext('calendar.rolenonparticipant');
 
       if (data.cutype != 'RESOURCE')
         opts['CHAIR'] =  rcmail.gettext('calendar.rolechair');
 
       if (organizer && !readonly)
           dispname = rcmail.env['identities-selector'];
       
       var select = '<select class="edit-attendee-role"' + (organizer || readonly ? ' disabled="true"' : '') + ' aria-label="' + rcmail.gettext('role','calendar') + '">';
       for (var r in opts)
         select += '<option value="'+ r +'" class="' + r.toLowerCase() + '"' + (data.role == r ? ' selected="selected"' : '') +'>' + Q(opts[r]) + '</option>';
       select += '</select>';
       
       // availability
       var avail = data.email ? 'loading' : 'unknown';
 
       // delete icon
       var icon = rcmail.env.deleteicon ? '<img src="' + rcmail.env.deleteicon + '" alt="" />' : rcmail.gettext('delete');
       var dellink = '<a href="#delete" class="iconlink delete deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';
       var tooltip = '', status = (data.status || '').toLowerCase(),
         status_label = rcmail.gettext('status' + status, 'libcalendaring');
 
       // send invitation checkbox
       var invbox = '<input type="checkbox" class="edit-attendee-reply" value="' + Q(data.email) +'" title="' + Q(rcmail.gettext('calendar.sendinvitations')) + '" '
         + (!data.noreply && settings.itip_notify & 1 ? 'checked="checked" ' : '') + '/>';
 
       if (data['delegated-to'])
-        tooltip = rcmail.gettext('delegatedto', 'calendar') + data['delegated-to'];
+        tooltip = rcmail.gettext('libcalendaring.delegatedto') + ' ' + data['delegated-to'];
       else if (data['delegated-from'])
-        tooltip = rcmail.gettext('delegatedfrom', 'calendar') + data['delegated-from'];
+        tooltip = rcmail.gettext('libcalendaring.delegatedfrom') + ' ' + data['delegated-from'];
       else if (status)
         tooltip = status_label;
 
       // add expand button for groups
       if (data.cutype == 'GROUP') {
         dispname += ' <a href="#expand" data-email="' + Q(data.email) + '" class="iconbutton add expandlink" title="' + rcmail.gettext('expandattendeegroup','libcalendaring') + '">' +
           rcmail.gettext('expandattendeegroup','libcalendaring') + '</a>';
       }
 
       var img_src = rcmail.assets_path('program/resources/blank.gif');
       var html = '<td class="role">' + select + '</td>' +
         '<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
         '<td class="availability"><img src="' + img_src + '" class="availabilityicon ' + avail + '" data-email="' + data.email + '" alt="" /></td>' +
         '<td class="confirmstate"><span class="' + status + '" title="' + Q(tooltip) + '">' + Q(status ? status_label : '') + '</span></td>' +
         (data.cutype != 'RESOURCE' ? '<td class="invite">' + (organizer || readonly || !invbox ? '' : invbox) + '</td>' : '') +
         '<td class="options">' + (organizer || readonly ? '' : dellink) + '</td>';
 
       var table = rcmail.env.calendar_resources && data.cutype == 'RESOURCE' ? resources_list : attendees_list;
       var tr = $('<tr>')
         .addClass(String(data.role).toLowerCase())
         .html(html);
 
       if (before)
         tr.insertBefore(before)
       else
         tr.appendTo(table);
 
       tr.find('a.deletelink').click({ id:(data.email || data.name) }, function(e) { remove_attendee(this, e.data.id); return false; });
       tr.find('a.mailtolink').click(event_attendee_click);
       tr.find('a.expandlink').click(data, function(e) { me.expand_attendee_group(e, add_attendee, remove_attendee); return false; });
       tr.find('input.edit-attendee-reply').click(function() {
         var enabled = $('#edit-attendees-invite:checked').length || $('input.edit-attendee-reply:checked').length;
         $('#eventedit .attendees-commentbox')[enabled ? 'show' : 'hide']();
       });
 
       // select organizer identity
       if (data.identity_id)
         $('#edit-identities-list').val(data.identity_id);
       
       // check free-busy status
       if (avail == 'loading') {
         check_freebusy_status(tr.find('img.availabilityicon'), data.email, me.selected_event);
       }
       
       event_attendees.push(data);
       return true;
     };
     
     // iterate over all attendees and update their free-busy status display
     var update_freebusy_status = function(event)
     {
       attendees_list.find('img.availabilityicon').each(function(i,v) {
         var email, icon = $(this);
         if (email = icon.attr('data-email'))
           check_freebusy_status(icon, email, event);
       });
       
       freebusy_ui.needsupdate = false;
     };
     
     // load free-busy status from server and update icon accordingly
     var check_freebusy_status = function(icon, email, event)
     {
       var calendar = event.calendar && me.calendars[event.calendar] ? me.calendars[event.calendar] : { freebusy:false };
       if (!calendar.freebusy) {
         $(icon).attr('class', 'availabilityicon unknown');
         return;
       }
       
       icon = $(icon).attr('class', 'availabilityicon loading');
       
       $.ajax({
         type: 'GET',
         dataType: 'html',
         url: rcmail.url('freebusy-status'),
         data: { email:email, start:date2servertime(clone_date(event.start, event.allDay?1:0)), end:date2servertime(clone_date(event.end, event.allDay?2:0)), _remote: 1 },
         success: function(status){
           var avail = String(status).toLowerCase();
           icon.removeClass('loading').addClass(avail).attr('alt', rcmail.gettext('avail' + avail, 'calendar'));
         },
         error: function(){
           icon.removeClass('loading').addClass('unknown').attr('alt', rcmail.gettext('availunknown', 'calendar'));
         }
       });
     };
     
     // remove an attendee from the list
     var remove_attendee = function(elem, id)
     {
       $(elem).closest('tr').remove();
       event_attendees = $.grep(event_attendees, function(data){ return (data.name != id && data.email != id) });
     };
 
     // open a dialog to display detailed free-busy information and to find free slots
     var event_resources_dialog = function(search)
     {
       var $dialog = $('#eventresourcesdialog');
 
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
   
       // dialog buttons
       var buttons = {};
   
       buttons[rcmail.gettext('addresource', 'calendar')] = function() {
         rcmail.command('add-resource');
       };
   
       buttons[rcmail.gettext('close')] = function() {
         $dialog.dialog("close");
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: true,
         closeOnEscape: true,
         title: rcmail.gettext('findresources', 'calendar'),
         open: function() {
           rcmail.ksearch_blur();
           $dialog.attr('aria-hidden', 'false');
         },
         close: function() {
           $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
         },
         resize: function(e) {
           var container = $(rcmail.gui_objects.resourceinfocalendar);
           container.fullCalendar('option', 'height', container.height() + 4);
         },
         buttons: buttons,
         width: 900,
         height: 500
       }).show();
 
       // define add-button as main action
       $('.ui-dialog-buttonset .ui-button', $dialog.parent()).first().addClass('mainaction').attr('id', 'rcmbtncalresadd');
 
       me.dialog_resize($dialog.get(0), 540, Math.min(1000, $(window).width() - 50));
 
       // set search query
       $('#resourcesearchbox').val(search || '');
 
       // initialize the treelist widget
       if (!resources_treelist) {
         resources_treelist = new rcube_treelist_widget(rcmail.gui_objects.resourceslist, {
           id_prefix: 'rcres',
           id_encode: rcmail.html_identifier_encode,
           id_decode: rcmail.html_identifier_decode,
           selectable: true,
           save_state: true
         });
         resources_treelist.addEventListener('select', function(node) {
           if (resources_data[node.id]) {
             resource_showinfo(resources_data[node.id]);
             rcmail.enable_command('add-resource', me.selected_event && $("#eventedit").is(':visible') ? true : false);
           }
           else {
             rcmail.enable_command('add-resource', false);
             $(rcmail.gui_objects.resourceinfo).hide();
             $(rcmail.gui_objects.resourceownerinfo).hide();
             $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);
           }
         });
 
         // fetch (all) resource data from server
         me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
         rcmail.http_request('resources-list', {}, me.loading_lock);
 
         // register button
         rcmail.register_button('add-resource', 'rcmbtncalresadd', 'uibutton');
 
         // initialize resource calendar display
         var resource_cal = $(rcmail.gui_objects.resourceinfocalendar);
         resource_cal.fullCalendar($.extend({}, fullcalendar_defaults, {
           header: { left: '', center: '', right: '' },
           height: resource_cal.height() + 4,
           defaultView: 'agendaWeek',
           eventSources: [],
           slotMinutes: 60,
           allDaySlot: false,
           eventRender: function(event, element, view) {
             var title = rcmail.get_label(event.status, 'calendar');
             element.addClass('status-' + event.status);
             element.find('.fc-event-head').hide();
             element.find('.fc-event-title').text(title);
             element.attr('aria-label', me.event_date_text(event, true) + ': ' + title);
           }
         }));
 
         $('#resource-calendar-prev').click(function(){
           resource_cal.fullCalendar('prev');
           return false;
         });
         $('#resource-calendar-next').click(function(){
           resource_cal.fullCalendar('next');
           return false;
         });
       }
       else if (search) {
         resource_search();
       }
       else {
         resource_render_list(resources_index);
       }
 
       if (me.selected_event && me.selected_event.start) {
         $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('gotoDate', me.selected_event.start);
       }
     };
 
     // render the resource details UI box
     var resource_showinfo = function(resource)
     {
       // inline function to render a resource attribute
       function render_attrib(value) {
         if (typeof value == 'boolean') {
           return value ? rcmail.get_label('yes') : rcmail.get_label('no');
         }
 
         return value;
       }
 
       if (rcmail.gui_objects.resourceinfo) {
         var tr, table = $(rcmail.gui_objects.resourceinfo).show().find('tbody').html(''),
           attribs = $.extend({ name:resource.name }, resource.attributes||{})
           attribs.description = resource.description;
 
         for (var k in attribs) {
           if (typeof attribs[k] == 'undefined')
             continue;
           table.append($('<tr>').addClass(k)
             .append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
             .append('<td class="value">' + text2html(render_attrib(attribs[k])) + '</td>')
           );
         }
 
         $(rcmail.gui_objects.resourceownerinfo).hide();
         $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('removeEventSource', resources_events_source);
 
         if (resource.owner) {
           // display cached data
           if (resource_owners[resource.owner]) {
             resource_owner_load(resource_owners[resource.owner]);
           }
           else {
             // fetch owner data from server
             me.loading_lock = rcmail.set_busy(true, 'loading', me.loading_lock);
             rcmail.http_request('resources-owner', { _id: resource.owner }, me.loading_lock);
           }
         }
 
         // load resource calendar
         resources_events_source.url = "./?_task=calendar&_action=resources-calendar&_id="+urlencode(resource.ID);
         $(rcmail.gui_objects.resourceinfocalendar).fullCalendar('addEventSource', resources_events_source);
       }
     };
 
     // callback from server for resource listing
     var resource_data_load = function(data)
     {
       var resources_tree = {};
 
       // store data by ID
       $.each(data, function(i, rec) {
         resources_data[rec.ID] = rec;
 
         // assign parent-relations
         if (rec.members) {
           $.each(rec.members, function(j, m){
             resources_tree[m] = rec.ID;
           });
         }
       });
 
       // walk the parent-child tree to determine the depth of each node
       $.each(data, function(i, rec) {
         rec._depth = 0;
         if (resources_tree[rec.ID])
           rec.parent_id = resources_tree[rec.ID];
 
         var parent_id = resources_tree[rec.ID];
         while (parent_id) {
           rec._depth++;
           parent_id = resources_tree[parent_id];
         }
       });
 
       // sort by depth, collection and name
       data.sort(function(a,b) {
         var j = a._type == 'collection' ? 1 : 0,
             k = b._type == 'collection' ? 1 : 0,
             d = a._depth - b._depth;
         if (!d) d = (k - j);
         if (!d) d = b.name < a.name ? 1 : -1;
         return d;
       });
 
       $.each(data, function(i, rec) {
         resources_index.push(rec.ID);
       });
 
       // apply search filter...
       if ($('#resourcesearchbox').val() != '')
         resource_search();
       else  // ...or render full list
         resource_render_list(resources_index);
 
       rcmail.set_busy(false, null, me.loading_lock);
     };
 
     // renders the given list of resource records into the treelist
     var resource_render_list = function(index) {
       var rec, link;
 
       resources_treelist.reset();
 
       $.each(index, function(i, dn) {
         if (rec = resources_data[dn]) {
           link = $('<a>').attr('href', '#')
             .attr('rel', rec.ID)
             .html(Q(rec.name));
 
           resources_treelist.insert({ id:rec.ID, html:link, classes:[rec._type], collapsed:true }, rec.parent_id, false);
         }
       });
     };
 
     // callback from server for owner information display
     var resource_owner_load = function(data)
     {
       if (data) {
         // cache this!
         resource_owners[data.ID] = data;
 
         var table = $(rcmail.gui_objects.resourceownerinfo).find('tbody').html('');
 
         for (var k in data) {
           if (k == 'event' || k == 'ID')
             continue;
 
           table.append($('<tr>').addClass(k)
             .append('<td class="title">' + Q(ucfirst(rcmail.get_label(k, 'calendar'))) + '</td>')
             .append('<td class="value">' + text2html(data[k]) + '</td>')
           );
         }
 
         table.parent().show();
       }
     }
 
     // quick-filter the loaded resource data
     var resource_search = function()
     {
       var dn, rec, dataset = [],
         q = $('#resourcesearchbox').val().toLowerCase();
 
       if (q.length && resources_data) {
         // search by iterating over all resource records
         for (dn in resources_data) {
           rec = resources_data[dn];
           if ((rec.name && String(rec.name).toLowerCase().indexOf(q) >= 0)
             || (rec.email && String(rec.email).toLowerCase().indexOf(q) >= 0)
             || (rec.description && String(rec.description).toLowerCase().indexOf(q) >= 0)
           ) {
             dataset.push(rec.ID);
           }
         }
 
         resource_render_list(dataset);
 
         // select single match
         if (dataset.length == 1) {
           resources_treelist.select(dataset[0]);
         }
       }
       else {
         $('#resourcesearchbox').val('');
       }
     };
 
     // 
     var reset_resource_search = function()
     {
       $('#resourcesearchbox').val('').focus();
       resource_render_list(resources_index);
     };
 
     // 
     var add_resource2event = function()
     {
       var resource = resources_data[resources_treelist.get_selection()];
       if (resource) {
         if (add_attendee($.extend({ role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }, resource)))
           rcmail.display_message(rcmail.get_label('resourceadded', 'calendar'), 'confirmation');
       }
     }
 
     // when the user accepts or declines an event invitation
     var event_rsvp = function(response, delegate, replymode)
     {
       var btn;
       if (typeof response == 'object') {
         btn = $(response);
         response = btn.attr('rel')
       }
       else {
         btn = $('#event-rsvp input.button[rel='+response+']');
       }
 
       // show menu to select rsvp reply mode (current or all)
       if (me.selected_event && me.selected_event.recurrence && !replymode) {
         rcube_libcalendaring.itip_rsvp_recurring(btn, function(resp, mode) {
           event_rsvp(resp, null, mode);
         });
         return;
       }
 
       if (me.selected_event && me.selected_event.attendees && response) {
         // bring up delegation dialog
         if (response == 'delegated' && !delegate) {
           rcube_libcalendaring.itip_delegate_dialog(function(data) {
             data.rsvp = data.rsvp ? 1 : '';
             event_rsvp('delegated', data, replymode);
           });
           return;
         }
 
         // update attendee status
         attendees = [];
         for (var data, i=0; i < me.selected_event.attendees.length; i++) {
           data = me.selected_event.attendees[i];
           if (settings.identity.emails.indexOf(';'+String(data.email).toLowerCase()) >= 0) {
             data.status = response.toUpperCase();
             data.rsvp = 0;  // unset RSVP flag
 
             if (data.status == 'DELEGATED') {
               data['delegated-to'] = delegate.to;
               data.rsvp = delegate.rsvp
             }
             else {
               if (data['delegated-to']) {
                 delete data['delegated-to'];
                 if (data.role == 'NON-PARTICIPANT' && data.status != 'DECLINED')
                   data.role = 'REQ-PARTICIPANT';
               }
             }
 
             attendees.push(i)
           }
           else if (response != 'DELEGATED' && data['delegated-from'] &&
               settings.identity.emails.indexOf(';'+String(data['delegated-from']).toLowerCase()) >= 0) {
             delete data['delegated-from'];
           }
 
           // set free_busy status to transparent if declined (#4425)
           if (data.status == 'DECLINED' || data.role == 'NON-PARTICIPANT') {
             me.selected_event.free_busy = 'free';
           }
           else {
             me.selected_event.free_busy = 'busy';
           }
         }
 
         // submit status change to server
         var submit_data = $.extend({}, me.selected_event, { source:null, comment:$('#reply-comment-event-rsvp').val(), _savemode: replymode || 'all' }, (delegate || {})),
           noreply = $('#noreply-event-rsvp:checked').length ? 1 : 0;
 
         // import event from mail (temporary iTip event)
         if (submit_data._mbox && submit_data._uid) {
           me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
           rcmail.http_post('mailimportitip', {
             _mbox: submit_data._mbox,
             _uid:  submit_data._uid,
             _part: submit_data._part,
             _status:  response,
             _to: (delegate ? delegate.to : null),
             _rsvp: (delegate && delegate.rsvp) ? 1 : 0,
             _noreply: noreply,
             _comment: submit_data.comment,
             _instance: submit_data._instance,
             _savemode: submit_data._savemode
           });
         }
         else if (settings.invitation_calendars) {
           update_event('rsvp', submit_data, { status:response, noreply:noreply, attendees:attendees });
         }
         else {
           me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
           rcmail.http_post('event', { action:'rsvp', e:submit_data, status:response, attendees:attendees, noreply:noreply });
         }
 
         event_show_dialog(me.selected_event);
       }
     };
     
     // add the given date to the RDATE list
     var add_rdate = function(date)
     {
       var li = $('<li>')
         .attr('data-value', date2servertime(date))
         .html('<span>' + Q($.fullCalendar.formatDate(date, settings['date_format'])) + '</span>')
         .appendTo('#edit-recurrence-rdates');
 
       $('<a>').attr('href', '#del')
         .addClass('iconbutton delete')
         .html(rcmail.get_label('delete', 'calendar'))
         .attr('title', rcmail.get_label('delete', 'calendar'))
         .appendTo(li);
     };
 
     // re-sort the list items by their 'data-value' attribute
     var sort_rdates = function()
     {
       var mylist = $('#edit-recurrence-rdates'),
         listitems = mylist.children('li').get();
       listitems.sort(function(a, b) {
          var compA = $(a).attr('data-value');
          var compB = $(b).attr('data-value');
          return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
       })
       $.each(listitems, function(idx, item) { mylist.append(item); });
     }
 
     // remove the link reference matching the given uri
     function remove_link(elem)
     {
       var $elem = $(elem), uri = $elem.attr('data-uri');
 
       me.selected_event.links = $.grep(me.selected_event.links, function(link) { return link.uri != uri; });
 
       // remove UI list item
       $elem.hide().closest('li').addClass('deleted');
     }
 
     // post the given event data to server
     var update_event = function(action, data, add)
     {
       me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
       rcmail.http_post('calendar/event', $.extend({ action:action, e:data }, (add || {})));
       
       // render event temporarily into the calendar
       if ((data.start && data.end) || data.id) {
         var event = data.id ? $.extend(fc.fullCalendar('clientEvents', function(e){ return e.id == data.id; })[0], data) : data;
         if (data.start)
           event.start = data.start;
         if (data.end)
           event.end = data.end;
         if (data.allday !== undefined)
           event.allDay = data.allday;
         event.editable = false;
         event.temp = true;
         event.className = 'fc-event-cal-'+data.calendar+' fc-event-temp';
         fc.fullCalendar(data.id ? 'updateEvent' : 'renderEvent', event);
 
         // mark all recurring instances as temp
         if (event.recurrence || event.recurrence_id) {
           var base_id = event.recurrence_id ? event.recurrence_id : String(event.id).replace(/-\d+(T\d{6})?$/, '');
           $.each(fc.fullCalendar('clientEvents', function(e){ return e.id == base_id || e.recurrence_id == base_id; }), function(i,ev) {
             ev.temp = true;
             ev.editable = false;
             event.className += ' fc-event-temp';
             fc.fullCalendar('updateEvent', ev);
           });
         }
       }
     };
 
     // mouse-click handler to check if the show dialog is still open and prevent default action
     var dialog_check = function(e)
     {
       var showd = $("#eventshow");
       if (showd.is(':visible') && !$(e.target).closest('.ui-dialog').length && !$(e.target).closest('.popupmenu').length) {
         showd.dialog('close');
         e.stopImmediatePropagation();
         ignore_click = true;
         return false;
       }
       else if (ignore_click) {
         window.setTimeout(function(){ ignore_click = false; }, 20);
         return false;
       }
       return true;
     };
 
     // display confirm dialog when modifying/deleting an event
     var update_event_confirm = function(action, event, data)
     {
       // Allow other plugins to do actions here
       // E.g. when you move/resize the event init wasn't called
       // but we need it as some plugins may modify user identities
       // we depend on here (kolab_delegation)
       rcmail.triggerEvent('calendar-event-init', {o: event});
 
       if (!data) data = event;
       var decline = false, notify = false, html = '', cal = me.calendars[event.calendar],
         _has_attendees = has_attendees(event), _is_organizer = is_organizer(event);
 
       // event has attendees, ask whether to notify them
       if (_has_attendees) {
         var checked = (settings.itip_notify & 1 ? ' checked="checked"' : '');
 
         if (_is_organizer) {
           notify = true;
           if (settings.itip_notify & 2) {
             html += '<div class="message">' +
               '<label><input class="confirm-attendees-donotify" type="checkbox"' + checked + ' value="1" name="notify" />&nbsp;' +
                 rcmail.gettext((action == 'remove' ? 'sendcancellation' : 'sendnotifications'), 'calendar') + 
               '</label></div>';
           }
           else {
             data._notify = settings.itip_notify;
           }
         }
         else if (action == 'remove' && is_attendee(event)) {
           decline = true;
           checked = event.status != 'CANCELLED' ? checked : '';
           html += '<div class="message">' +
             '<label><input class="confirm-attendees-decline" type="checkbox"' + checked + ' value="1" name="decline" />&nbsp;' +
             rcmail.gettext('itipdeclineevent', 'calendar') + 
             '</label></div>';
         }
         else {
           html += '<div class="message">' + rcmail.gettext('localchangeswarning', 'calendar') + '</div>';
         }
       }
 
       // recurring event: user needs to select the savemode
       if (event.recurrence) {
         var future_disabled = '', message_label = (action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning');
 
         // disable the 'future' savemode if I'm an attendee
         // reason: no calendaring system supports the thisandfuture range parameter in iTip REPLY
         if (action == 'remove' && _has_attendees && !_is_organizer && is_attendee(event)) {
           future_disabled = ' disabled';
         }
 
         html += '<div class="message"><span class="ui-icon ui-icon-alert"></span>' +
           rcmail.gettext(message_label, 'calendar') + '</div>' +
           '<div class="savemode">' +
             '<a href="#current" class="button">' + rcmail.gettext('currentevent', 'calendar') + '</a>' +
             '<a href="#future" class="button' + future_disabled + '">' + rcmail.gettext('futurevents', 'calendar') + '</a>' +
             '<a href="#all" class="button">' + rcmail.gettext('allevents', 'calendar') + '</a>' +
             (action != 'remove' ? '<a href="#new" class="button">' + rcmail.gettext('saveasnew', 'calendar') + '</a>' : '') +
           '</div>';
       }
       
       // show dialog
       if (html) {
         var $dialog = $('<div>').html(html);
       
         $dialog.find('a.button').button().filter(':not(.disabled)').click(function(e) {
           data._savemode = String(this.href).replace(/.+#/, '');
           data._notify = settings.itip_notify;
 
           // open event edit dialog when saving as new
           if (data._savemode == 'new') {
             event._savemode = 'new';
             event_edit_dialog('edit', event);
             fc.fullCalendar('refetchEvents');
           }
           else {
             if ($dialog.find('input.confirm-attendees-donotify').length)
               data._notify = $dialog.find('input.confirm-attendees-donotify').get(0).checked ? 1 : 0;
             if (decline) {
               data._decline = $dialog.find('input.confirm-attendees-decline:checked').length;
               data._notify = 0;
             }
             update_event(action, data);
           }
 
           $dialog.dialog("close");
           return false;
         });
         
         var buttons = [];
 
         if (!event.recurrence) {
           buttons.push({
             text: rcmail.gettext((action == 'remove' ? 'delete' : 'save'), 'calendar'),
             click: function() {
               data._notify = notify && $dialog.find('input.confirm-attendees-donotify:checked').length ? 1 : 0;
               data._decline = decline && $dialog.find('input.confirm-attendees-decline:checked').length ? 1 : 0;
               update_event(action, data);
               $(this).dialog("close");
             }
           });
         }
 
         buttons.push({
           text: rcmail.gettext('cancel', 'calendar'),
           click: function() {
             $(this).dialog("close");
           }
         });
 
         $dialog.dialog({
           modal: true,
           width: 460,
           dialogClass: 'warning',
           title: rcmail.gettext((action == 'remove' ? 'removeeventconfirm' : 'changeeventconfirm'), 'calendar'),
           buttons: buttons,
           open: function() {
             setTimeout(function(){
               $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
             }, 5);
           },
           close: function(){
             $dialog.dialog("destroy").remove();
             if (!rcmail.busy)
               fc.fullCalendar('refetchEvents');
           }
         }).addClass('event-update-confirm').show();
         
         return false;
       }
       // show regular confirm box when deleting
       else if (action == 'remove' && !cal.undelete) {
         if (!confirm(rcmail.gettext('deleteventconfirm', 'calendar')))
           return false;
       }
 
       // do update
       update_event(action, data);
       
       return true;
     };
 
     var update_agenda_toolbar = function()
     {
       $('#agenda-listrange').val(fc.fullCalendar('option', 'listRange'));
       $('#agenda-listsections').val(fc.fullCalendar('option', 'listSections'));
     }
 
 
     /*** public methods ***/
 
     /**
      * Remove saving lock and free the UI for new input
      */
     this.unlock_saving = function()
     {
         if (me.saving_lock)
             rcmail.set_busy(false, null, me.saving_lock);
     };
 
     // opens calendar day-view in a popup
     this.fisheye_view = function(date)
     {
       $('#fish-eye-view:ui-dialog').dialog('close');
       
       // create list of active event sources
       var src, cals = {}, sources = [];
       for (var id in this.calendars) {
         src = $.extend({}, this.calendars[id]);
         src.editable = false;
         src.url = null;
         src.events = [];
 
         if (src.active) {
           cals[id] = src;
           sources.push(src);
         }
       }
       
       // copy events already loaded
       var events = fc.fullCalendar('clientEvents');
       for (var event, i=0; i< events.length; i++) {
         event = events[i];
         if (event.source && (src = cals[event.source.id])) {
           src.events.push(event);
         }
       }
       
       var h = $(window).height() - 50;
       var dialog = $('<div>')
         .attr('id', 'fish-eye-view')
         .dialog({
           modal: true,
           width: 680,
           height: h,
           title: $.fullCalendar.formatDate(date, 'dddd ' + settings['date_long']),
           close: function(){
             dialog.dialog("destroy");
             me.fisheye_date = null;
           }
         })
         .fullCalendar($.extend({}, fullcalendar_defaults, {
           defaultView: 'agendaDay',
           header: { left: '', center: '', right: '' },
           height: h - 50,
           date: date.getDate(),
           month: date.getMonth(),
           year: date.getFullYear(),
           eventSources: sources
         }));
         
         this.fisheye_date = date;
     };
 
     // opens the given calendar in a popup dialog
     this.quickview = function(id, shift)
     {
       var src, in_quickview = false;
       $.each(this.quickview_sources, function(i,cal) {
         if (cal.id == id) {
           in_quickview = true;
           src = cal;
         }
       });
 
       // remove source from quickview
       if (in_quickview && shift) {
         this.quickview_sources = $.grep(this.quickview_sources, function(src) { return src.id != id; });
       }
       else {
         if (!shift) {
           // remove all current quickview event sources
           if (this.quickview_active) {
             fc.fullCalendar('removeEventSources');
           }
 
           this.quickview_sources = [];
 
           // uncheck all active quickview icons
           calendars_list.container.find('div.focusview')
             .add('#calendars .searchresults div.focusview')
             .removeClass('focusview')
               .find('a.quickview').attr('aria-checked', 'false');
         }
 
         if (!in_quickview) {
           // clone and modify calendar properties
           src = $.extend({}, this.calendars[id]);
           src.url += '&_quickview=1';
           this.quickview_sources.push(src);
         }
       }
 
       // disable quickview
       if (this.quickview_active && !this.quickview_sources.length) {
         // register regular calendar event sources
         $.each(this.calendars, function(k, cal) {
           if (cal.active)
             fc.fullCalendar('addEventSource', cal);
         });
 
         this.quickview_active = false;
         $('body').removeClass('quickview-active');
 
         // uncheck all active quickview icons
         calendars_list.container.find('div.focusview')
           .add('#calendars .searchresults div.focusview')
           .removeClass('focusview')
             .find('a.quickview').attr('aria-checked', 'false');
       }
       // activate quickview
       else if (!this.quickview_active) {
         // remove regular calendar event sources
         fc.fullCalendar('removeEventSources');
 
         // register quickview event sources
         $.each(this.quickview_sources, function(i, src) {
           fc.fullCalendar('addEventSource', src);
         });
 
         this.quickview_active = true;
         $('body').addClass('quickview-active');
       }
       // update quickview sources
       else if (in_quickview) {
         fc.fullCalendar('removeEventSource', src);
       }
       else if (src) {
         fc.fullCalendar('addEventSource', src);
       }
 
       // activate quickview icon
       if (this.quickview_active) {
         $(calendars_list.get_item(id)).find('.calendar').first()
           .add('#calendars .searchresults .cal-' + id)
           [in_quickview ? 'removeClass' : 'addClass']('focusview')
             .find('a.quickview').attr('aria-checked', in_quickview ? 'false' : 'true');
       }
     };
 
     // disable quickview mode
     function reset_quickview()
     {
       // remove all current quickview event sources
       if (me.quickview_active) {
         fc.fullCalendar('removeEventSources');
         me.quickview_sources = [];
       }
 
       // register regular calendar event sources
       $.each(me.calendars, function(k, cal) {
         if (cal.active)
           fc.fullCalendar('addEventSource', cal);
       });
 
       // uncheck all active quickview icons
       calendars_list.container.find('div.focusview')
         .add('#calendars .searchresults div.focusview')
         .removeClass('focusview')
           .find('a.quickview').attr('aria-checked', 'false');
 
       me.quickview_active = false;
       $('body').removeClass('quickview-active');
     };
 
     //public method to show the print dialog.
     this.print_calendars = function(view)
     {
       if (!view) view = fc.fullCalendar('getView').name;
       var date = fc.fullCalendar('getDate') || new Date();
       var range = fc.fullCalendar('option', 'listRange');
       var sections = fc.fullCalendar('option', 'listSections');
       rcmail.open_window(rcmail.url('print', { view: view, date: date2unixtime(date), range: range, sections: sections, search: this.search_query }), true, true);
     };
 
     // public method to bring up the new event dialog
     this.add_event = function(templ) {
       if (this.selected_calendar) {
         var now = new Date();
         var date = fc.fullCalendar('getDate');
         if (typeof date != 'Date')
           date = now;
         date.setHours(now.getHours()+1);
         date.setMinutes(0);
         var end = new Date(date.getTime());
         end.setHours(date.getHours()+1);
         event_edit_dialog('new', $.extend({ start:date, end:end, allDay:false, calendar:this.selected_calendar }, templ || {}));
       }
     };
 
     // delete the given event after showing a confirmation dialog
     this.delete_event = function(event) {
       // show confirm dialog for recurring events, use jquery UI dialog
       return update_event_confirm('remove', event, { id:event.id, calendar:event.calendar, attendees:event.attendees });
     };
     
     // opens a jquery UI dialog with event properties (or empty for creating a new calendar)
     this.calendar_edit_dialog = function(calendar)
     {
       // close show dialog first
       var $dialog = $("#calendarform");
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
       
       if (!calendar)
         calendar = { name:'', color:'cc0000', editable:true, showalarms:true };
       
       var form, name, color, alarms;
       
       $dialog.html(rcmail.get_label('loading'));
       $.ajax({
         type: 'GET',
         dataType: 'html',
         url: rcmail.url('calendar'),
         data: { action:(calendar.id ? 'form-edit' : 'form-new'), c:{ id:calendar.id } },
         success: function(data) {
           $dialog.html(data);
           // resize and reposition dialog window
           form = $('#calendarpropform');
           me.dialog_resize('#calendarform', form.height(), form.width());
           name = $('#calendar-name').prop('disabled', !calendar.editable).val(calendar.editname || calendar.name);
           color = $('#calendar-color').val(calendar.color).miniColors({ value: calendar.color, colorValues:rcmail.env.mscolors });
           alarms = $('#calendar-showalarms').prop('checked', calendar.showalarms).get(0);
           name.select();
         }
       });
 
       // dialog buttons
       var buttons = {};
       
       buttons[rcmail.gettext('save', 'calendar')] = function() {
         // form is not loaded
         if (!form || !form.length)
           return;
           
         // TODO: do some input validation
         if (!name.val() || name.val().length < 2) {
           alert(rcmail.gettext('invalidcalendarproperties', 'calendar'));
           name.select();
           return;
         }
         
         // post data to server
         var data = form.serializeJSON();
         if (data.color)
           data.color = data.color.replace(/^#/, '');
         if (calendar.id)
           data.id = calendar.id;
         if (alarms)
           data.showalarms = alarms.checked ? 1 : 0;
 
         me.saving_lock = rcmail.set_busy(true, 'calendar.savingdata');
         rcmail.http_post('calendar', { action:(calendar.id ? 'edit' : 'new'), c:data });
         $dialog.dialog("close");
       };
 
       buttons[rcmail.gettext('cancel', 'calendar')] = function() {
         $dialog.dialog("close");
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: true,
         closeOnEscape: false,
         title: rcmail.gettext((calendar.id ? 'editcalendar' : 'createcalendar'), 'calendar'),
         open: function() {
           $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
         },
         close: function() {
           $dialog.html('').dialog("destroy").hide();
         },
         buttons: buttons,
         minWidth: 400,
         width: 420
       }).show();
 
     };
 
     this.calendar_remove = function(calendar)
     {
       this.calendar_destroy_source(calendar.id);
       rcmail.http_post('calendar', { action:'subscribe', c:{ id:calendar.id, active:0, permanent:0, recursive:1 } });
       return true;
     };
 
     this.calendar_delete = function(calendar)
     {
       if (confirm(rcmail.gettext(calendar.children ? 'deletecalendarconfirmrecursive' : 'deletecalendarconfirm', 'calendar'))) {
         rcmail.http_post('calendar', { action:'delete', c:{ id:calendar.id } });
         return true;
       }
       return false;
     };
 
     this.calendar_refresh_source = function(id)
     {
       // got race-conditions fc.currentFetchID when using refetchEvents,
       // so we remove and add the source instead
       // fc.fullCalendar('refetchEvents', me.calendars[id]);
       fc.fullCalendar('removeEventSource', me.calendars[id]);
       fc.fullCalendar('addEventSource', me.calendars[id]);
     };
 
     this.calendar_destroy_source = function(id)
     {
       var delete_ids = [];
 
       if (this.calendars[id]) {
         // find sub-calendars
         if (this.calendars[id].children) {
           for (var child_id in this.calendars) {
             if (String(child_id).indexOf(id) == 0)
               delete_ids.push(child_id);
           }
         }
         else {
           delete_ids.push(id);
         }
       }
 
       // delete all calendars in the list
       for (var i=0; i < delete_ids.length; i++) {
         id = delete_ids[i];
         calendars_list.remove(id);
         fc.fullCalendar('removeEventSource', this.calendars[id]);
         $('#edit-calendar option[value="'+id+'"]').remove();
         delete this.calendars[id];
       }
     };
 
     // open a dialog to upload an .ics file with events to be imported
     this.import_events = function(calendar)
     {
       // close show dialog first
       var $dialog = $("#eventsimport"),
         form = rcmail.gui_objects.importform;
       
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
       
       if (calendar)
         $('#event-import-calendar').val(calendar.id);
       
       var buttons = {};
       buttons[rcmail.gettext('import', 'calendar')] = function() {
         if (form && form.elements._data.value) {
           rcmail.async_upload_form(form, 'import_events', function(e) {
             rcmail.set_busy(false, null, me.saving_lock);
             $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
 
             // display error message if no sophisticated response from server arrived (e.g. iframe load error)
             if (me.import_succeeded === null)
               rcmail.display_message(rcmail.get_label('importerror', 'calendar'), 'error');
           });
 
           // display upload indicator (with extended timeout)
           var timeout = rcmail.env.request_timeout;
           rcmail.env.request_timeout = 600;
           me.import_succeeded = null;
           me.saving_lock = rcmail.set_busy(true, 'uploading');
           $('.ui-dialog-buttonpane button', $dialog.parent()).button('disable');
 
           // restore settings
           rcmail.env.request_timeout = timeout;
         }
       };
 
       buttons[rcmail.gettext('cancel', 'calendar')] = function() {
         $dialog.dialog("close");
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: false,
         closeOnEscape: false,
         title: rcmail.gettext('importevents', 'calendar'),
         open: function() {
           $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
         },
         close: function() {
           $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
           $dialog.dialog("destroy").hide();
         },
         buttons: buttons,
         width: 520
       }).show();
     };
 
     // callback from server if import succeeded
     this.import_success = function(p)
     {
       this.import_succeeded = true;
       $("#eventsimport:ui-dialog").dialog('close');
       rcmail.set_busy(false, null, me.saving_lock);
       rcmail.gui_objects.importform.reset();
 
       if (p.refetch)
         this.refresh(p);
     };
 
     // callback from server to report errors on import
     this.import_error = function(p)
     {
       this.import_succeeded = false;
       rcmail.set_busy(false, null, me.saving_lock);
       rcmail.display_message(p.message || rcmail.get_label('importerror', 'calendar'), 'error');
     }
 
     // open a dialog to select calendars for export
     this.export_events = function(calendar)
     {
       // close show dialog first
       var $dialog = $("#eventsexport"),
         form = rcmail.gui_objects.exportform;
 
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
 
       if (calendar)
         $('#event-export-calendar').val(calendar.id);
 
       $('#event-export-range').change(function(e){
         var custom = $('option:selected', this).val() == 'custom',
           input = $('#event-export-startdate')
         input.parent()[(custom?'show':'hide')]();
         if (custom)
           input.select();
       })
 
       var buttons = {};
       buttons[rcmail.gettext('export', 'calendar')] = function() {
         if (form) {
           var start = 0, range = $('#event-export-range option:selected', this).val(),
             source = $('#event-export-calendar option:selected').val(),
             attachmt = $('#event-export-attachments').get(0).checked;
 
           if (range == 'custom')
             start = date2unixtime(parse_datetime('00:00', $('#event-export-startdate').val()));
           else if (range > 0)
             start = 'today -' + range + ' months';
 
           rcmail.goto_url('export_events', { source:source, start:start, attachments:attachmt?1:0 });
         }
         $dialog.dialog("close");
       };
 
       buttons[rcmail.gettext('cancel', 'calendar')] = function() {
         $dialog.dialog("close");
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: false,
         closeOnEscape: false,
         title: rcmail.gettext('exporttitle', 'calendar'),
         open: function() {
           $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
         },
         close: function() {
           $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
           $dialog.dialog("destroy").hide();
         },
         buttons: buttons,
         width: 520
       }).show();
     };
 
     // download the selected event as iCal
     this.event_download = function(event)
     {
       if (event && event.id) {
         rcmail.goto_url('export_events', { source:event.calendar, id:event.id, attachments:1 });
       }
     };
 
     // open the message compose step with a calendar_event parameter referencing the selected event.
     // the server-side plugin hook will pick that up and attach the event to the message.
     this.event_sendbymail = function(event, e)
     {
       if (event && event.id) {
         rcmail.command('compose', { _calendar_event:event._id }, e ? e.target : null, e);
       }
     };
 
     // show URL of the given calendar in a dialog box
     this.showurl = function(calendar)
     {
       var $dialog = $('#calendarurlbox');
 
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
 
       if (calendar.feedurl) {
         if (calendar.caldavurl) {
           $('#caldavurl').val(calendar.caldavurl);
           $('#calendarcaldavurl').show();
         }
         else {
           $('#calendarcaldavurl').hide();
         }
 
         $dialog.dialog({
           resizable: true,
           closeOnEscape: true,
           title: rcmail.gettext('showurl', 'calendar'),
           close: function() {
             $dialog.dialog("destroy").hide();
           },
           width: 520
         }).show();
 
         $('#calfeedurl').val(calendar.feedurl).select();
       }
     };
 
     // refresh the calendar view after saving event data
     this.refresh = function(p)
     {
       var source = me.calendars[p.source];
 
       // helper function to update the given fullcalendar view
       function update_view(view, event, source) {
         var existing = view.fullCalendar('clientEvents', event._id);
         if (existing.length) {
           $.extend(existing[0], event);
           view.fullCalendar('updateEvent', existing[0]);
           // remove old recurrence instances
           if (event.recurrence && !event.recurrence_id)
             view.fullCalendar('removeEvents', function(e){ return e._id.indexOf(event._id+'-') == 0; });
         }
         else {
           event.source = source;  // link with source
           view.fullCalendar('renderEvent', event);
         }
       }
 
       // remove temp events
       fc.fullCalendar('removeEvents', function(e){ return e.temp; });
 
       if (source && (p.refetch || (p.update && !source.active))) {
         // activate event source if new event was added to an invisible calendar
         if (this.quickview_active) {
           // map source to the quickview_sources equivalent
           $.each(this.quickview_sources, function(src) {
             if (src.id == source.id) {
               source = src;
               return false;
             }
           });
           fc.fullCalendar('refetchEvents', source, true);
         }
         else if (!source.active) {
           source.active = true;
           fc.fullCalendar('addEventSource', source);
           $('#rcmlical' + source.id + ' input').prop('checked', true);
         }
         else
           fc.fullCalendar('refetchEvents', source, true);
 
         fetch_counts();
       }
       // add/update single event object
       else if (source && p.update) {
         var event = p.update;
         event.temp = false;
         event.editable = 0;
 
           // update fish-eye view
         if (this.fisheye_date)
           update_view($('#fish-eye-view'), event, source);
 
         // update main view
         event.editable = source.editable;
         update_view(fc, event, source);
 
         // update the currently displayed event dialog
         if ($('#eventshow').is(':visible') && me.selected_event && me.selected_event.id == event.id)
           event_show_dialog(event)
       }
       // refetch all calendars
       else if (p.refetch) {
         fc.fullCalendar('refetchEvents', undefined, true);
         fetch_counts();
       }
     };
 
     // modify query parameters for refresh requests
     this.before_refresh = function(query)
     {
       var view = fc.fullCalendar('getView');
 
       query.start = date2unixtime(view.visStart);
       query.end = date2unixtime(view.visEnd);
 
       if (this.search_query)
         query.q = this.search_query;
 
       return query;
     };
 
     // callback from server providing event counts
     this.update_counts = function(p)
     {
       $.each(p.counts, function(cal, count) {
         var li = calendars_list.get_item(cal),
           bubble = $(li).children('.calendar').find('span.count');
 
         if (!bubble.length && count > 0) {
           bubble = $('<span>')
             .addClass('count')
             .appendTo($(li).children('.calendar').first())
         }
 
         if (count > 0) {
           bubble.text(count).show();
         }
         else {
           bubble.text('').hide();
         }
       });
     };
 
     // callback after an iTip message event was imported
     this.itip_message_processed = function(data)
     {
       // remove temporary iTip source
       fc.fullCalendar('removeEventSource', this.calendars['--invitation--itip']);
 
       $('#eventshow:ui-dialog').dialog('close');
       this.selected_event = null;
 
       // refresh destination calendar source
       this.refresh({ source:data.calendar, refetch:true });
 
       this.unlock_saving();
 
       // process 'after_action' in mail task
       if (window.opener && window.opener.rcube_libcalendaring)
         window.opener.rcube_libcalendaring.itip_message_processed(data);
     };
 
     // reload the calendar view by keeping the current date/view selection
     this.reload_view = function()
     {
       var query = { view: fc.fullCalendar('getView').name },
         date = fc.fullCalendar('getDate');
       if (date)
         query.date = date2unixtime(date);
       rcmail.redirect(rcmail.url('', query));
     }
 
     // update browser location to remember current view
     this.update_state = function()
     {
       var query = { view: current_view },
         date = fc.fullCalendar('getDate');
       if (date)
         query.date = date2unixtime(date);
 
       if (window.history.replaceState)
         window.history.replaceState({}, document.title, rcmail.url('', query).replace('&_action=', ''));
     };
 
     this.resource_search = resource_search;
     this.reset_resource_search = reset_resource_search;
     this.add_resource2event = add_resource2event;
     this.resource_data_load = resource_data_load;
     this.resource_owner_load = resource_owner_load;
 
 
     /***  event searching  ***/
 
     // execute search
     this.quicksearch = function()
     {
       if (rcmail.gui_objects.qsearchbox) {
         var q = rcmail.gui_objects.qsearchbox.value;
         if (q != '') {
           var id = 'search-'+q;
           var sources = [];
           
           if (me.quickview_active)
             reset_quickview();
           
           if (this._search_message)
             rcmail.hide_message(this._search_message);
           
           for (var sid in this.calendars) {
             if (this.calendars[sid]) {
               this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '') + '&q=' + urlencode(q);
               sources.push(sid);
             }
           }
           id += '@'+sources.join(',');
           
           // ignore if query didn't change
           if (this.search_request == id) {
             return;
           }
           // remember current view
           else if (!this.search_request) {
             this.default_view = fc.fullCalendar('getView').name;
           }
           
           this.search_request = id;
           this.search_query = q;
           
           // change to list view
           fc.fullCalendar('option', 'listSections', 'month')
             .fullCalendar('option', 'listRange', Math.max(60, settings['agenda_range']))
             .fullCalendar('changeView', 'table');
           
           update_agenda_toolbar();
           
           // refetch events with new url (if not already triggered by changeView)
           if (!this.is_loading)
             fc.fullCalendar('refetchEvents');
         }
         else  // empty search input equals reset
           this.reset_quicksearch();
       }
     };
 
     // reset search and get back to normal event listing
     this.reset_quicksearch = function()
     {
       $(rcmail.gui_objects.qsearchbox).val('');
       
       if (this._search_message)
         rcmail.hide_message(this._search_message);
       
       if (this.search_request) {
         // hide bottom links of agenda view
         fc.find('.fc-list-content > .fc-listappend').hide();
         
         // restore original event sources and view mode from fullcalendar
         fc.fullCalendar('option', 'listSections', settings['agenda_sections'])
           .fullCalendar('option', 'listRange', settings['agenda_range']);
         
         update_agenda_toolbar();
         
         for (var sid in this.calendars) {
           if (this.calendars[sid])
             this.calendars[sid].url = this.calendars[sid].url.replace(/&q=.+/, '');
         }
         if (this.default_view)
           fc.fullCalendar('changeView', this.default_view);
         
         if (!this.is_loading)
           fc.fullCalendar('refetchEvents');
         
         this.search_request = this.search_query = null;
       }
     };
 
     // callback if all sources have been fetched from server
     this.events_loaded = function(count)
     {
       var addlinks, append = '';
       
       // enhance list view when searching
       if (this.search_request) {
         if (!count) {
           this._search_message = rcmail.display_message(rcmail.gettext('searchnoresults', 'calendar'), 'notice');
           append = '<div class="message">' + rcmail.gettext('searchnoresults', 'calendar') + '</div>';
         }
         append += '<div class="fc-bottomlinks formlinks"></div>';
         addlinks = true;
       }
       
       if (fc.fullCalendar('getView').name == 'table') {
         var container = fc.find('.fc-list-content > .fc-listappend');
         if (append) {
           if (!container.length)
             container = $('<div class="fc-listappend"></div>').appendTo(fc.find('.fc-list-content'));
           container.html(append).show();
         }
         else if (container.length)
           container.hide();
         
         // add links to adjust search date range
         if (addlinks) {
           var lc = container.find('.fc-bottomlinks');
           $('<a>').attr('href', '#').html(rcmail.gettext('searchearlierdates', 'calendar')).appendTo(lc).click(function(){
             fc.fullCalendar('incrementDate', 0, -1, 0);
           });
           lc.append(" ");
           $('<a>').attr('href', '#').html(rcmail.gettext('searchlaterdates', 'calendar')).appendTo(lc).click(function(){
             var range = fc.fullCalendar('option', 'listRange');
             if (range < 90) {
               fc.fullCalendar('option', 'listRange', fc.fullCalendar('option', 'listRange') + 30).fullCalendar('render');
               update_agenda_toolbar();
             }
             else
               fc.fullCalendar('incrementDate', 0, 1, 0);
           });
         }
       }
       
       if (this.fisheye_date)
         this.fisheye_view(this.fisheye_date);
     };
 
     // resize and reposition (center) the dialog window
     this.dialog_resize = function(id, height, width)
     {
       var win = $(window), w = win.width(), h = win.height();
       $(id).dialog('option', { height: Math.min(h-20, height+130), width: Math.min(w-20, width+50) })
         .dialog('option', 'position', ['center', 'center']);  // only works in a separate call (!?)
     };
 
     // adjust calendar view size
     this.view_resize = function()
     {
       var footer = fc.fullCalendar('getView').name == 'table' ? $('#agendaoptions').outerHeight() : 0;
       fc.fullCalendar('option', 'height', $('#calendar').height() - footer);
     };
 
     // mark the given calendar folder as selected
     this.select_calendar = function(id, nolistupdate)
     {
       if (!nolistupdate)
         calendars_list.select(id);
 
       // trigger event hook
       rcmail.triggerEvent('selectfolder', { folder:id, prefix:'rcmlical' });
 
       this.selected_calendar = id;
 
       rcmail.update_state({source: id});
     };
 
     // register the given calendar to the current view
     var add_calendar_source = function(cal)
     {
       var color, brightness, select, id = cal.id;
 
       me.calendars[id] = $.extend({
         url: rcmail.url('calendar/load_events', { source: id }),
         className: 'fc-event-cal-'+id,
         id: id
       }, cal);
 
       // choose black text color when background is bright, white otherwise
       if (color = settings.event_coloring % 2  ? '' : '#' + cal.color) {
         if (/^#([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.test(color)) {
           // use information about brightness calculation found at
           // http://javascriptrules.com/2009/08/05/css-color-brightness-contrast-using-javascript/
           brightness = (parseInt(RegExp.$1, 16) * 299 + parseInt(RegExp.$2, 16) * 587 + parseInt(RegExp.$3, 16) * 114) / 1000;
           if (brightness > 125)
             me.calendars[id].textColor = 'black';
         }
 
         me.calendars[id].color = color;
       }
 
       if (fc && (cal.active || cal.subscribed)) {
         if (cal.active)
           fc.fullCalendar('addEventSource', me.calendars[id]);
 
         var submit = { id: id, active: cal.active ? 1 : 0 };
         if (cal.subscribed !== undefined)
             submit.permanent = cal.subscribed ? 1 : 0;
         rcmail.http_post('calendar', { action:'subscribe', c:submit });
       }
 
       // insert to #calendar-select options if writeable
       select = $('#edit-calendar');
       if (fc && has_permission(cal, 'i') && select.length && !select.find('option[value="'+id+'"]').length) {
         $('<option>').attr('value', id).html(cal.name).appendTo(select);
       }
     }
 
     // fetch counts for some calendars from the server
     var fetch_counts = function()
     {
       if (count_sources.length) {
         setTimeout(function() {
           rcmail.http_request('calendar/count', { source:count_sources });
         }, 500);
       }
     };
 
 
     /***  startup code  ***/
 
     // create list of event sources AKA calendars
     var id, cal, active, event_sources = [];
     for (id in rcmail.env.calendars) {
       cal = rcmail.env.calendars[id];
       active = cal.active || false;
       add_calendar_source(cal);
 
       // check active calendars
       $('#rcmlical'+id+' > .calendar input').prop('checked', active);
 
       if (active) {
         event_sources.push(this.calendars[id]);
       }
       if (cal.counts) {
         count_sources.push(id);
       }
 
       if (cal.editable && !this.selected_calendar) {
         this.selected_calendar = id;
         rcmail.enable_command('addevent', true);
       }
     }
 
     // initialize treelist widget that controls the calendars list
     var widget_class = window.kolab_folderlist || rcube_treelist_widget;
     calendars_list = new widget_class(rcmail.gui_objects.calendarslist, {
       id_prefix: 'rcmlical',
       selectable: true,
       save_state: true,
       keyboard: false,
       searchbox: '#calendarlistsearch',
       search_action: 'calendar/calendar',
       search_sources: [ 'folders', 'users' ],
       search_title: rcmail.gettext('calsearchresults','calendar')
     });
     calendars_list.addEventListener('select', function(node) {
       if (node && node.id && me.calendars[node.id]) {
         me.select_calendar(node.id, true);
         rcmail.enable_command('calendar-edit', 'calendar-showurl', true);
         rcmail.enable_command('calendar-delete', me.calendars[node.id].editable);
         rcmail.enable_command('calendar-remove', me.calendars[node.id] && me.calendars[node.id].removable);
       }
     });
     calendars_list.addEventListener('insert-item', function(p) {
       var cal = p.data;
       if (cal && cal.id) {
         add_calendar_source(cal);
 
         // add css classes related to this calendar to document
         if (cal.css) {
           $('<style type="text/css"></style>')
             .html(cal.css)
             .appendTo('head');
         }
       }
     });
     calendars_list.addEventListener('subscribe', function(p) {
       var cal;
       if ((cal = me.calendars[p.id])) {
         cal.subscribed = p.subscribed || false;
         rcmail.http_post('calendar', { action:'subscribe', c:{ id:p.id, active:cal.active?1:0, permanent:cal.subscribed?1:0 } });
       }
     });
     calendars_list.addEventListener('remove', function(p) {
       if (me.calendars[p.id] && me.calendars[p.id].removable) {
         me.calendar_remove(me.calendars[p.id]);
       }
     });
     calendars_list.addEventListener('search-complete', function(data) {
       if (data.length)
         rcmail.display_message(rcmail.gettext('nrcalendarsfound','calendar').replace('$nr', data.length), 'voice');
       else
         rcmail.display_message(rcmail.gettext('nocalendarsfound','calendar'), 'info');
     });
     calendars_list.addEventListener('click-item', function(event) {
       // handle clicks on quickview icon: temprarily add this source and open in quickview
       if ($(event.target).hasClass('quickview') && event.data) {
         if (!me.calendars[event.data.id]) {
           event.data.readonly = true;
           event.data.active = false;
           event.data.subscribed = false;
           add_calendar_source(event.data);
         }
         me.quickview(event.data.id, event.shiftKey || event.metaKey || event.ctrlKey);
         return false;
       }
     });
 
     // init (delegate) event handler on calendar list checkboxes
     $(rcmail.gui_objects.calendarslist).on('click', 'input[type=checkbox]', function(e) {
       e.stopPropagation();
 
       if (me.quickview_active) {
         this.checked = !this.checked;
         return false;
       }
 
       var id = this.value;
       if (me.calendars[id]) {  // add or remove event source on click
         var action;
         if (this.checked) {
           action = 'addEventSource';
           me.calendars[id].active = true;
         }
         else {
           action = 'removeEventSource';
           me.calendars[id].active = false;
         }
 
         // adjust checked state of original list item
         if (calendars_list.is_search()) {
           calendars_list.container.find('input[value="'+id+'"]').prop('checked', this.checked);
         }
 
         // add/remove event source
         fc.fullCalendar(action, me.calendars[id]);
         rcmail.http_post('calendar', { action:'subscribe', c:{ id:id, active:me.calendars[id].active?1:0 } });
       }
     })
     .on('keypress', 'input[type=checkbox]', function(e) {
         // select calendar on <Enter>
         if (e.keyCode == 13) {
             calendars_list.select(this.value);
             return rcube_event.cancel(e);
         }
     })
     // init (delegate) event handler on quickview links
     .on('click', 'a.quickview', function(e) {
       var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');
 
       if (calendars_list.is_search())
         id = id.replace(/--xsR$/, '');
 
       if (me.calendars[id])
         me.quickview(id, e.shiftKey || e.metaKey || e.ctrlKey);
 
       if (!rcube_event.is_keyboard(e) && this.blur)
         this.blur();
 
       e.stopPropagation();
       return false;
     });
 
     // register dbl-click handler to open calendar edit dialog
     $(rcmail.gui_objects.calendarslist).on('dblclick', ':not(.virtual) > .calname', function(e){
       var id = $(this).closest('li').attr('id').replace(/^rcmlical/, '');
       me.calendar_edit_dialog(me.calendars[id]);
     });
 
     // select default calendar
     if (rcmail.env.source && this.calendars[rcmail.env.source])
       this.selected_calendar = rcmail.env.source;
     else if (settings.default_calendar && this.calendars[settings.default_calendar] && this.calendars[settings.default_calendar].editable)
       this.selected_calendar = settings.default_calendar;
     
     if (this.selected_calendar)
       this.select_calendar(this.selected_calendar);
     
     var viewdate = new Date();
     if (rcmail.env.date)
       viewdate.setTime(fromunixtime(rcmail.env.date));
 
     // add source with iTip event data for rendering
     if (rcmail.env.itip_events && rcmail.env.itip_events.length) {
       me.calendars['--invitation--itip'] = {
         events: rcmail.env.itip_events,
         className: 'fc-event-cal---invitation--itip',
         color: '#fff',
         textColor: '#333',
         editable: false,
         rights: 'lrs',
         attendees: true
       };
       event_sources.push(me.calendars['--invitation--itip']);
     }
 
     // initalize the fullCalendar plugin
     var fc = $('#calendar').fullCalendar($.extend({}, fullcalendar_defaults, {
       header: {
         right: 'prev,next today',
         center: 'title',
         left: 'agendaDay,agendaWeek,month,table'
       },
       date: viewdate.getDate(),
       month: viewdate.getMonth(),
       year: viewdate.getFullYear(),
       height: $('#calendar').height(),
       eventSources: event_sources,
       selectable: true,
       selectHelper: false,
       loading: function(isLoading) {
         me.is_loading = isLoading;
         this._rc_loading = rcmail.set_busy(isLoading, 'loading', this._rc_loading);
         // trigger callback
         if (!isLoading)
           me.events_loaded($(this).fullCalendar('clientEvents').length);
       },
       // callback for date range selection
       select: function(start, end, allDay, e, view) {
         var range_select = (!allDay || start.getDate() != end.getDate())
         if (dialog_check(e) && range_select)
           event_edit_dialog('new', { start:start, end:end, allDay:allDay, calendar:me.selected_calendar });
         if (range_select || ignore_click)
           view.calendar.unselect();
       },
       // callback for clicks in all-day box
       dayClick: function(date, allDay, e, view) {
         var now = new Date().getTime();
         if (now - day_clicked_ts < 400 && day_clicked == date.getTime()) {  // emulate double-click on day
           var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
           return event_edit_dialog('new', { start:date, end:enddate, allDay:allDay, calendar:me.selected_calendar });
         }
         
         if (!ignore_click) {
           view.calendar.gotoDate(date);
           if (day_clicked && new Date(day_clicked).getMonth() != date.getMonth())
             view.calendar.select(date, date, allDay);
         }
         day_clicked = date.getTime();
         day_clicked_ts = now;
       },
       // callback when an event was dragged and finally dropped
       eventDrop: function(event, dayDelta, minuteDelta, allDay, revertFunc) {
         if (event.end == null || event.end.getTime() < event.start.getTime()) {
           event.end = new Date(event.start.getTime() + (allDay ? DAY_MS : HOUR_MS));
         }
         // moved to all-day section: set times to 12:00 - 13:00
         if (allDay && !event.allDay) {
           event.start.setHours(12);
           event.start.setMinutes(0);
           event.start.setSeconds(0);
           event.end.setHours(13);
           event.end.setMinutes(0);
           event.end.setSeconds(0);
         }
         // moved from all-day section: set times to working hours
         else if (event.allDay && !allDay) {
           var newstart = event.start.getTime();
           revertFunc();  // revert to get original duration
           var numdays = Math.max(1, Math.round((event.end.getTime() - event.start.getTime()) / DAY_MS)) - 1;
           event.start = new Date(newstart);
           event.end = new Date(newstart + numdays * DAY_MS);
           event.end.setHours(settings['work_end'] || 18);
           event.end.setMinutes(0);
           
           if (event.end.getTime() < event.start.getTime())
             event.end = new Date(newstart + HOUR_MS);
         }
         
         // send move request to server
         var data = {
           id: event.id,
           calendar: event.calendar,
           start: date2servertime(event.start),
           end: date2servertime(event.end),
           allday: allDay?1:0
         };
         update_event_confirm('move', event, data);
       },
       // callback for event resizing
       eventResize: function(event, delta) {
         // sanitize event dates
         if (event.allDay)
           event.start.setHours(12);
         if (!event.end || event.end.getTime() < event.start.getTime())
           event.end = new Date(event.start.getTime() + HOUR_MS);
 
         // send resize request to server
         var data = {
           id: event.id,
           calendar: event.calendar,
           start: date2servertime(event.start),
           end: date2servertime(event.end)
         };
         update_event_confirm('resize', event, data);
       },
       viewDisplay: function(view) {
         $('#agendaoptions')[view.name == 'table' ? 'show' : 'hide']();
         if (minical) {
           window.setTimeout(function(){ minical.datepicker('setDate', fc.fullCalendar('getDate')); }, exec_deferred);
           if (view.name != current_view)
             me.view_resize();
           current_view = view.name;
           me.update_state();
         }
       },
       viewRender: function(view) {
         if (fc && view.name == 'month')
           fc.fullCalendar('option', 'maxHeight', Math.floor((view.element.parent().height()-18) / 6) - 35);
       }
     }));
 
     // if start date is changed, shift end date according to initial duration
     var shift_enddate = function(dateText) {
       var newstart = parse_datetime('0', dateText);
       var newend = new Date(newstart.getTime() + $('#edit-startdate').data('duration') * 1000);
       $('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
       event_times_changed();
     };
 
     // Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
     // Uses the default $.datepicker.iso8601Week() function but takes firstDay setting into account.
     // This is a temporary fix until http://bugs.jqueryui.com/ticket/8420 is resolved.
     var iso8601Week = datepicker_settings.calculateWeek = function(date) {
       var mondayOffset = Math.abs(1 - datepicker_settings.firstDay);
       return $.datepicker.iso8601Week(new Date(date.getTime() + mondayOffset * 86400000));
     };
 
     var minical;
     var init_calendar_ui = function()
     {
       // initialize small calendar widget using jQuery UI datepicker
       minical = $('#datepicker').datepicker($.extend(datepicker_settings, {
         inline: true,
         showWeek: true,
         changeMonth: true,
         changeYear: true,
         onSelect: function(dateText, inst) {
           ignore_click = true;
           var d = minical.datepicker('getDate'); //parse_datetime('0:0', dateText);
           fc.fullCalendar('gotoDate', d).fullCalendar('select', d, d, true);
         },
         onChangeMonthYear: function(year, month, inst) {
           minical.data('year', year).data('month', month);
         },
         beforeShowDay: function(date) {
           var view = fc.fullCalendar('getView');
           var active = view.visStart && date.getTime() >= view.visStart.getTime() && date.getTime() < view.visEnd.getTime();
           return [ true, (active ? 'ui-datepicker-activerange ui-datepicker-active-' + view.name : ''), ''];
         }
       })) // set event handler for clicks on calendar week cell of the datepicker widget
         .on('click', 'td.ui-datepicker-week-col', function(e) {
           var cell = $(e.target);
           if (e.target.tagName == 'TD') {
             var base_date = minical.datepicker('getDate');
             if (minical.data('month'))
               base_date.setMonth(minical.data('month')-1);
             if (minical.data('year'))
               base_date.setYear(minical.data('year'));
             base_date.setHours(12);
             base_date.setDate(base_date.getDate() - ((base_date.getDay() + 6) % 7) + datepicker_settings.firstDay);
             var base_kw = iso8601Week(base_date),
               target_kw = parseInt(cell.html()),
               wdiff = target_kw - base_kw;
             if (wdiff > 10)  // year jump
               base_date.setYear(base_date.getFullYear() - 1);
             else if (wdiff < -10)
               base_date.setYear(base_date.getFullYear() + 1);
             // select monday of the chosen calendar week
             var day_off = base_date.getDay() - datepicker_settings.firstDay,
               date = new Date(base_date.getTime() - day_off * DAY_MS + wdiff * 7 * DAY_MS);
             fc.fullCalendar('gotoDate', date).fullCalendar('setDate', date).fullCalendar('changeView', 'agendaWeek');
             minical.datepicker('setDate', date);
           }
         });
 
       minical.find('.ui-datepicker-inline').attr('aria-labelledby', 'aria-label-minical');
 
       if (rcmail.env.date) {
         var viewdate = new Date();
         viewdate.setTime(fromunixtime(rcmail.env.date));
         minical.datepicker('setDate', viewdate);
       }
 
       // init event dialog
       $('#eventtabs').tabs({
         activate: function(event, ui) {
           if (ui.newPanel.selector == '#event-panel-attendees' || ui.newPanel.selector == '#event-panel-resources') {
             var tab = ui.newPanel.selector == '#event-panel-resources' ? 'resource' : 'attendee';
             if (!rcube_event.is_keyboard(event))
               $('#edit-'+tab+'-name').select();
             // update free-busy status if needed
             if (freebusy_ui.needsupdate && me.selected_event)
               update_freebusy_status(me.selected_event);
             // add current user as organizer if non added yet
             if (!event_attendees.length) {
               add_attendee($.extend({ role:'ORGANIZER' }, settings.identity));
               $('#edit-attendees-form .attendees-invitebox').show();
             }
           }
           // reset autocompletion on tab change (#3389)
           if (ui.oldPanel.selector == '#event-panel-attendees' || ui.oldPanel.selector == '#event-panel-resources') {
             rcmail.ksearch_blur();
           }
         }
       });
       $('#edit-enddate').datepicker(datepicker_settings);
       $('#edit-startdate').datepicker(datepicker_settings).datepicker('option', 'onSelect', shift_enddate).change(function(){ shift_enddate(this.value); });
       $('#edit-enddate').datepicker('option', 'onSelect', event_times_changed).change(event_times_changed);
       $('#edit-allday').click(function(){ $('#edit-starttime, #edit-endtime')[(this.checked?'hide':'show')](); event_times_changed(); });
 
       // configure drop-down menu on time input fields based on jquery UI autocomplete
       $('#edit-starttime, #edit-endtime, #eventedit input.edit-alarm-time').each(function() {
         me.init_time_autocomplete(this, {
           container: '#eventedit',
           change: event_times_changed
         });
       });
 
       // adjust end time when changing start
       $('#edit-starttime').change(function(e) {
         var dstart = $('#edit-startdate'),
           newstart = parse_datetime(this.value, dstart.val()),
           newend = new Date(newstart.getTime() + dstart.data('duration') * 1000);
         $('#edit-endtime').val($.fullCalendar.formatDate(newend, me.settings['time_format']));
         $('#edit-enddate').val($.fullCalendar.formatDate(newend, me.settings['date_format']));
         event_times_changed();
       });
 
       // register events on alarms and recurrence fields
       me.init_alarms_edit('#edit-alarms');
       me.init_recurrence_edit('#eventedit');
 
       // reload free-busy status when changing the organizer identity
       $('#eventedit').on('change', '#edit-identities-list', function(e) {
         var email = settings.identities[$(this).val()],
           icon = $(this).closest('tr').find('img.availabilityicon');
 
         if (email && icon.length) {
           icon.attr('data-email', email);
           check_freebusy_status(icon, email, me.selected_event);
         }
       });
 
       $('#event-export-startdate').datepicker(datepicker_settings);
 
       // init attendees autocompletion
       var ac_props;
       // parallel autocompletion
       if (rcmail.env.autocomplete_threads > 0) {
         ac_props = {
           threads: rcmail.env.autocomplete_threads,
           sources: rcmail.env.autocomplete_sources
         };
       }
       rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
       rcmail.addEventListener('autocomplete_insert', function(e) {
         var success = false;
         if (e.field.name == 'participant') {
           success = add_attendees(e.insert, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:(e.data && e.data.type == 'group' ? 'GROUP' : 'INDIVIDUAL') });
         }
         else if (e.field.name == 'resource' && e.data && e.data.email) {
           success = add_attendee($.extend(e.data, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' }));
         }
         if (e.field && success) {
           e.field.value = '';
         }
       });
 
       $('#edit-attendee-add').click(function(){
         var input = $('#edit-attendee-name');
         rcmail.ksearch_blur();
         if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'INDIVIDUAL' })) {
           input.val('');
         }
       });
 
       rcmail.init_address_input_events($('#edit-resource-name'), { action:'calendar/resources-autocomplete' });
 
       $('#edit-resource-add').click(function(){
         var input = $('#edit-resource-name');
         rcmail.ksearch_blur();
         if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'RESOURCE' })) {
           input.val('');
         }
       });
       
       $('#edit-resource-find').click(function(){
         event_resources_dialog();
         return false;
       });
 
       // handle change of "send invitations" checkbox
       $('#edit-attendees-invite').change(function() {
         $('#edit-attendees-donotify,input.edit-attendee-reply').prop('checked', this.checked);
         // hide/show comment field
         $('#eventedit .attendees-commentbox')[this.checked ? 'show' : 'hide']();
       });
 
       // delegate change event to "send invitations" checkbox
       $('#edit-attendees-donotify').change(function() {
         $('#edit-attendees-invite').click();
         return false;
       });
 
       $('#edit-attendee-schedule').click(function(){
         event_freebusy_dialog();
       });
 
       $('#shedule-freebusy-prev').html(bw.ie6 ? '&lt;&lt;' : '&#9668;').button().click(function(){ render_freebusy_grid(-1); });
       $('#shedule-freebusy-next').html(bw.ie6 ? '&gt;&gt;' : '&#9658;').button().click(function(){ render_freebusy_grid(1); }).parent().buttonset();
 
       $('#shedule-find-prev').button().click(function(){ freebusy_find_slot(-1); });
       $('#shedule-find-next').button().click(function(){ freebusy_find_slot(1); });
 
       $('#schedule-freebusy-workinghours').click(function(){
         freebusy_ui.workinhoursonly = this.checked;
         $('#workinghourscss').remove();
         if (this.checked)
           $('<style type="text/css" id="workinghourscss"> td.offhours { opacity:0.3; filter:alpha(opacity=30) } </style>').appendTo('head');
       });
 
       $('#event-rsvp input.button').click(function(e) {
         event_rsvp(this)
       });
 
       $('#eventedit input.edit-recurring-savemode').change(function(e) {
         var sel = $('input.edit-recurring-savemode:checked').val(),
           disabled = sel == 'current' || sel == 'future';
         $('#event-panel-recurrence input, #event-panel-recurrence select, #event-panel-attachments input').prop('disabled', disabled);
         $('#event-panel-recurrence, #event-panel-attachments')[(disabled?'addClass':'removeClass')]('disabled');
       })
 
       $('#eventshow .changersvp').click(function(e) {
         var d = $('#eventshow'),
           h = -$(this).closest('.event-line').toggle().height();
         $('#event-rsvp').slideDown(300, function() {
           h += $(this).height();
           me.dialog_resize(d.get(0), d.height() + h, d.outerWidth() - 50);
         });
         return false;
       })
 
       // register click handler for message links
       $('#edit-event-links, #event-links').on('click', 'li a.messagelink', function(e) {
         rcmail.open_window(this.href);
         if (!rcube_event.is_keyboard(e) && this.blur)
           this.blur();
         return false;
       });
 
       // register click handler for message delete buttons
       $('#edit-event-links').on('click', 'li a.delete', function(e) {
           remove_link(e.target);
           return false;
       });
 
       $('#agenda-listrange').change(function(e){
         settings['agenda_range'] = parseInt($(this).val());
         fc.fullCalendar('option', 'listRange', settings['agenda_range']).fullCalendar('render');
         // TODO: save new settings in prefs
       }).val(settings['agenda_range']);
 
       $('#agenda-listsections').change(function(e){
         settings['agenda_sections'] = $(this).val();
         fc.fullCalendar('option', 'listSections', settings['agenda_sections']).fullCalendar('render');
         // TODO: save new settings in prefs
       }).val(fc.fullCalendar('option', 'listSections'));
 
       // hide event dialog when clicking somewhere into document
       $(document).bind('mousedown', dialog_check);
 
       rcmail.set_busy(false, 'loading', ui_loading);
     }
 
     // initialize more UI elements (deferred)
     window.setTimeout(init_calendar_ui, exec_deferred);
 
     // fetch counts for some calendars
     fetch_counts();
 
     // add proprietary css styles if not IE
     if (!bw.ie)
       $('div.fc-content').addClass('rcube-fc-content');
 
     // IE supresses 2nd click event when double-clicking
     if (bw.ie && bw.vendver < 9) {
       $('div.fc-content').bind('dblclick', function(e){
         if (!$(this).hasClass('fc-widget-header') && fc.fullCalendar('getView').name != 'table') {
           var date = fc.fullCalendar('getDate');
           var enddate = new Date(); enddate.setTime(date.getTime() + DAY_MS - 60000);
           event_edit_dialog('new', { start:date, end:enddate, allDay:true, calendar:me.selected_calendar });
         }
       });
     }
 } // end rcube_calendar class
 
 
 /* calendar plugin initialization */
 window.rcmail && rcmail.addEventListener('init', function(evt) {
   // configure toolbar buttons
   rcmail.register_command('addevent', function(){ cal.add_event(); }, true);
   rcmail.register_command('print', function(){ cal.print_calendars(); }, true);
 
   // configure list operations
   rcmail.register_command('calendar-create', function(){ cal.calendar_edit_dialog(null); }, true);
   rcmail.register_command('calendar-edit', function(){ cal.calendar_edit_dialog(cal.calendars[cal.selected_calendar]); }, false);
   rcmail.register_command('calendar-remove', function(){ cal.calendar_remove(cal.calendars[cal.selected_calendar]); }, false);
   rcmail.register_command('calendar-delete', function(){ cal.calendar_delete(cal.calendars[cal.selected_calendar]); }, false);
   rcmail.register_command('events-import', function(){ cal.import_events(cal.calendars[cal.selected_calendar]); }, true);
   rcmail.register_command('calendar-showurl', function(){ cal.showurl(cal.calendars[cal.selected_calendar]); }, false);
   rcmail.register_command('event-download', function(){ cal.event_download(cal.selected_event); }, true);
   rcmail.register_command('event-sendbymail', function(p, obj, e){ cal.event_sendbymail(cal.selected_event, e); }, true);
   rcmail.register_command('event-history', function(p, obj, e){ cal.event_history_dialog(cal.selected_event); }, false);
 
   // search and export events
   rcmail.register_command('export', function(){ cal.export_events(cal.calendars[cal.selected_calendar]); }, true);
   rcmail.register_command('search', function(){ cal.quicksearch(); }, true);
   rcmail.register_command('reset-search', function(){ cal.reset_quicksearch(); }, true);
 
   // resource invitation dialog
   rcmail.register_command('search-resource', function(){ cal.resource_search(); }, true);
   rcmail.register_command('reset-resource-search', function(){ cal.reset_resource_search(); }, true);
   rcmail.register_command('add-resource', function(){ cal.add_resource2event(); }, false);
 
   // register callback commands
   rcmail.addEventListener('plugin.refresh_source', function(data) { cal.calendar_refresh_source(data); });
   rcmail.addEventListener('plugin.destroy_source', function(p){ cal.calendar_destroy_source(p.id); });
   rcmail.addEventListener('plugin.unlock_saving', function(p){ cal.unlock_saving(); });
   rcmail.addEventListener('plugin.refresh_calendar', function(p){ cal.refresh(p); });
   rcmail.addEventListener('plugin.import_success', function(p){ cal.import_success(p); });
   rcmail.addEventListener('plugin.import_error', function(p){ cal.import_error(p); });
   rcmail.addEventListener('plugin.update_counts', function(p){ cal.update_counts(p); });
   rcmail.addEventListener('plugin.reload_view', function(p){ cal.reload_view(p); });
   rcmail.addEventListener('plugin.resource_data', function(p){ cal.resource_data_load(p); });
   rcmail.addEventListener('plugin.resource_owner', function(p){ cal.resource_owner_load(p); });
   rcmail.addEventListener('plugin.render_event_changelog', function(data){ cal.render_event_changelog(data); });
   rcmail.addEventListener('plugin.event_show_diff', function(data){ cal.event_show_diff(data); });
   rcmail.addEventListener('plugin.close_history_dialog', function(data){ cal.close_history_dialog(); });
   rcmail.addEventListener('plugin.event_show_revision', function(data){ cal.event_show_dialog(data, null, true); });
   rcmail.addEventListener('plugin.itip_message_processed', function(data){ cal.itip_message_processed(data); });
   rcmail.addEventListener('requestrefresh', function(q){ return cal.before_refresh(q); });
 
   // let's go
   var cal = new rcube_calendar_ui($.extend(rcmail.env.calendar_settings, rcmail.env.libcal_settings));
 
   $(window).resize(function(e) {
     // check target due to bugs in jquery
     // http://bugs.jqueryui.com/ticket/7514
     // http://bugs.jquery.com/ticket/9841
     if (e.target == window) {
       cal.view_resize();
     }
   }).resize();
 
   // show calendars list when ready
   $('#calendars').css('visibility', 'inherit');
 
   // show toolbar
   $('#toolbar').show();
 
 });
diff --git a/plugins/calendar/localization/en_US.inc b/plugins/calendar/localization/en_US.inc
index 43d07922..1ca5c632 100644
--- a/plugins/calendar/localization/en_US.inc
+++ b/plugins/calendar/localization/en_US.inc
@@ -1,301 +1,299 @@
 <?php
 
 /**
  * Localizations for Kolab Calendar plugin
  *
  * Copyright (C) 2014, Kolab Systems AG
  *
  * For translation see https://www.transifex.com/projects/p/kolab/resource/calendar/
  */
 
 $labels = array();
 
 // preferences
 $labels['default_view'] = 'Default view';
 $labels['time_format'] = 'Time format';
 $labels['timeslots'] = 'Time slots per hour';
 $labels['first_day'] = 'First weekday';
 $labels['first_hour'] = 'First hour to show';
 $labels['workinghours'] = 'Working hours';
 $labels['add_category'] = 'Add category';
 $labels['remove_category'] = 'Remove category';
 $labels['defaultcalendar'] = 'Create new events in';
 $labels['eventcoloring'] = 'Event coloring';
 $labels['coloringmode0'] = 'According to calendar';
 $labels['coloringmode1'] = 'According to category';
 $labels['coloringmode2'] = 'Calendar for outline, category for content';
 $labels['coloringmode3'] = 'Category for outline, calendar for content';
 $labels['afternothing'] = 'Do nothing';
 $labels['aftertrash'] = 'Move to Trash';
 $labels['afterdelete'] = 'Delete the message';
 $labels['afterflagdeleted'] = 'Flag as deleted';
 $labels['aftermoveto'] = 'Move to...';
 $labels['itipoptions'] = 'Event Invitations';
 $labels['afteraction'] = 'After an invitation or update message is processed';
 
 // calendar
 $labels['calendar'] = 'Calendar';
 $labels['calendars'] = 'Calendars';
 $labels['category'] = 'Category';
 $labels['categories'] = 'Categories';
 $labels['createcalendar'] = 'Create new calendar';
 $labels['editcalendar'] = 'Edit calendar properties';
 $labels['name'] = 'Name';
 $labels['color'] = 'Color';
 $labels['day'] = 'Day';
 $labels['week'] = 'Week';
 $labels['month'] = 'Month';
 $labels['agenda'] = 'Agenda';
 $labels['new'] = 'New';
 $labels['new_event'] = 'New event';
 $labels['edit_event'] = 'Edit event';
 $labels['edit'] = 'Edit';
 $labels['save'] = 'Save';
 $labels['removelist'] = 'Remove from list';
 $labels['cancel'] = 'Cancel';
 $labels['select'] = 'Select';
 $labels['print'] = 'Print';
 $labels['printtitle'] = 'Print calendars';
 $labels['title'] = 'Summary';
 $labels['description'] = 'Description';
 $labels['all-day'] = 'all-day';
 $labels['export'] = 'Export';
 $labels['exporttitle'] = 'Export to iCalendar';
 $labels['exportrange'] = 'Events from';
 $labels['exportattachments'] = 'With attachments';
 $labels['customdate'] = 'Custom date';
 $labels['location'] = 'Location';
 $labels['url'] = 'URL';
 $labels['date'] = 'Date';
 $labels['start'] = 'Start';
 $labels['starttime'] = 'Start time';
 $labels['end'] = 'End';
 $labels['endtime'] = 'End time';
 $labels['repeat'] = 'Repeat';
 $labels['selectdate'] = 'Choose date';
 $labels['freebusy'] = 'Show me as';
 $labels['free'] = 'Free';
 $labels['busy'] = 'Busy';
 $labels['outofoffice'] = 'Out of Office';
 $labels['tentative'] = 'Tentative';
 $labels['mystatus'] = 'My status';
 $labels['status'] = 'Status';
 $labels['status-confirmed'] = 'Confirmed';
 $labels['status-cancelled'] = 'Cancelled';
 $labels['priority'] = 'Priority';
 $labels['sensitivity'] = 'Privacy';
 $labels['public'] = 'public';
 $labels['private'] = 'private';
 $labels['confidential'] = 'confidential';
 $labels['links'] = 'Reference';
 $labels['alarms'] = 'Reminder';
 $labels['comment'] = 'Comment';
 $labels['created'] = 'Created';
 $labels['changed'] = 'Last Modified';
 $labels['unknown'] = 'Unknown';
 $labels['eventoptions'] = 'Options';
 $labels['generated'] = 'generated at';
 $labels['eventhistory'] = 'History';
 $labels['removelink'] = 'Remove email reference';
 $labels['printdescriptions'] = 'Print descriptions';
 $labels['parentcalendar'] = 'Insert inside';
 $labels['searchearlierdates'] = '« Search for earlier events';
 $labels['searchlaterdates'] = 'Search for later events »';
 $labels['andnmore'] = '$nr more...';
 $labels['togglerole'] = 'Click to toggle role';
 $labels['createfrommail'] = 'Save as event';
 $labels['importevents'] = 'Import events';
 $labels['importrange'] = 'Events from';
 $labels['onemonthback'] = '1 month back';
 $labels['nmonthsback'] = '$nr months back';
 $labels['showurl'] = 'Show calendar URL';
 $labels['showurldescription'] = 'Use the following address to access (read only) your calendar from other applications. You can copy and paste this into any calendar software that supports the iCal format.';
 $labels['caldavurldescription'] = 'Copy this address to a <a href="http://en.wikipedia.org/wiki/CalDAV" target="_blank">CalDAV</a> client application (e.g. Evolution or Mozilla Thunderbird) to fully synchronize this specific calendar with your computer or mobile device.';
 $labels['findcalendars'] = 'Find calendars...';
 $labels['searchterms'] = 'Search terms';
 $labels['calsearchresults'] = 'Available Calendars';
 $labels['calendarsubscribe'] = 'List permanently';
 $labels['nocalendarsfound'] = 'No calendars found';
 $labels['nrcalendarsfound'] = '$nr calendars found';
 $labels['quickview'] = 'View only this calendar';
 $labels['invitationspending'] = 'Pending invitations';
 $labels['invitationsdeclined'] = 'Declined invitations';
 $labels['changepartstat'] = 'Change participant status';
 $labels['rsvpcomment'] = 'Invitation text';
 
 // agenda view
 $labels['listrange'] = 'Range to display:';
 $labels['listsections'] = 'Divide into:';
 $labels['smartsections'] = 'Smart sections';
 $labels['until'] = 'until';
 $labels['today'] = 'Today';
 $labels['tomorrow'] = 'Tomorrow';
 $labels['thisweek'] = 'This week';
 $labels['nextweek'] = 'Next week';
 $labels['prevweek'] = 'Previous week';
 $labels['thismonth'] = 'This month';
 $labels['nextmonth'] = 'Next month';
 $labels['weekofyear'] = 'Week';
 $labels['pastevents'] = 'Past';
 $labels['futureevents'] = 'Future';
 
 // alarm/reminder settings
 $labels['showalarms'] = 'Show reminders';
 $labels['defaultalarmtype'] = 'Default reminder setting';
 $labels['defaultalarmoffset'] = 'Default reminder time';
 
 // attendees
 $labels['attendee'] = 'Participant';
 $labels['role'] = 'Role';
 $labels['availability'] = 'Avail.';
 $labels['confirmstate'] = 'Status';
 $labels['addattendee'] = 'Add participant';
 $labels['roleorganizer'] = 'Organizer';
 $labels['rolerequired'] = 'Required';
 $labels['roleoptional'] = 'Optional';
 $labels['rolechair'] = 'Chair';
 $labels['rolenonparticipant'] = 'Absent';
 $labels['cutypeindividual'] = 'Individual';
 $labels['cutypegroup'] = 'Group';
 $labels['cutyperesource'] = 'Resource';
 $labels['cutyperoom'] = 'Room';
 $labels['availfree'] = 'Free';
 $labels['availbusy'] = 'Busy';
 $labels['availunknown'] = 'Unknown';
 $labels['availtentative'] = 'Tentative';
 $labels['availoutofoffice'] = 'Out of Office';
-$labels['delegatedto'] = 'Delegated to: ';
-$labels['delegatedfrom'] = 'Delegated from: ';
 $labels['scheduletime'] = 'Find availability';
 $labels['sendinvitations'] = 'Send invitations';
 $labels['sendnotifications'] = 'Notify participants about modifications';
 $labels['sendcancellation'] = 'Notify participants about event cancellation';
 $labels['onlyworkinghours'] = 'Find availability within my working hours';
 $labels['reqallattendees'] = 'Required/all participants';
 $labels['prevslot'] = 'Previous Slot';
 $labels['nextslot'] = 'Next Slot';
 $labels['suggestedslot'] = 'Suggested Slot';
 $labels['noslotfound'] = 'Unable to find a free time slot';
 $labels['invitationsubject'] = 'You\'ve been invited to "$title"';
 $labels['invitationmailbody'] = "*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees\n\nPlease find attached an iCalendar file with all the event details which you can import to your calendar application.";
 $labels['invitationattendlinks'] = "In case your email client doesn't support iTip requests you can use the following link to either accept or decline this invitation:\n\$url";
 $labels['eventupdatesubject'] = '"$title" has been updated';
 $labels['eventupdatesubjectempty'] = 'An event that concerns you has been updated';
 $labels['eventupdatemailbody'] = "*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees\n\nPlease find attached an iCalendar file with the updated event details which you can import to your calendar application.";
 $labels['eventcancelsubject'] = '"$title" has been cancelled';
 $labels['eventcancelmailbody'] = "*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees\n\nThe event has been cancelled by \$organizer.\n\nPlease find attached an iCalendar file with the updated event details.";
 
 // invitation handling (overrides labels from libcalendaring)
 $labels['itipobjectnotfound'] = 'The event referred by this message was not found in your calendar.';
 
 $labels['itipmailbodyaccepted'] = "\$sender has accepted the invitation to the following event:\n\n*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees";
 $labels['itipmailbodytentative'] = "\$sender has tentatively accepted the invitation to the following event:\n\n*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees";
 $labels['itipmailbodydeclined'] = "\$sender has declined the invitation to the following event:\n\n*\$title*\n\nWhen: \$date\n\nInvitees: \$attendees";
 $labels['itipmailbodycancel'] = "\$sender has rejected your participation in the following event:\n\n*\$title*\n\nWhen: \$date";
 $labels['itipmailbodydelegated'] = "\$sender has delegated the participation in the following event:\n\n*\$title*\n\nWhen: \$date";
 $labels['itipmailbodydelegatedto'] = "\$sender has delegated the participation in the following event to you:\n\n*\$title*\n\nWhen: \$date";
 
 $labels['itipdeclineevent'] = 'Do you want to decline your invitation to this event?';
 $labels['declinedeleteconfirm'] = 'Do you also want to delete this declined event from your calendar?';
 $labels['itipcomment'] = 'Invitation/notification comment';
 $labels['itipcommenttitle'] = 'This comment will be attached to the invitation/notification message sent to participants';
 
 $labels['notanattendee'] = 'You\'re not listed as an attendee of this event';
 $labels['eventcancelled'] = 'The event has been cancelled';
 $labels['saveincalendar'] = 'save in';
 $labels['updatemycopy'] = 'Update in my calendar';
 $labels['savetocalendar'] = 'Save to calendar';
 $labels['openpreview'] = 'Check Calendar';
 $labels['noearlierevents'] = 'No earlier events';
 $labels['nolaterevents'] = 'No later events';
 
 // resources
 $labels['resource'] = 'Resource';
 $labels['addresource'] = 'Book resource';
 $labels['findresources'] = 'Find resources';
 $labels['resourcedetails'] = 'Details';
 $labels['resourceavailability'] = 'Availability';
 $labels['resourceowner'] = 'Owner';
 $labels['resourceadded'] = 'The resource was added to your event';
 
 // event dialog tabs
 $labels['tabsummary'] = 'Summary';
 $labels['tabrecurrence'] = 'Recurrence';
 $labels['tabattendees'] = 'Participants';
 $labels['tabresources'] = 'Resources';
 $labels['tabattachments'] = 'Attachments';
 $labels['tabsharing'] = 'Sharing';
 
 // messages
 $labels['deleteobjectconfirm'] = 'Do you really want to delete this event?';
 $labels['deleteventconfirm'] = 'Do you really want to delete this event?';
 $labels['deletecalendarconfirm'] = 'Do you really want to delete this calendar with all its events?';
 $labels['deletecalendarconfirmrecursive'] = 'Do you really want to delete this calendar with all its events and sub-calendars?';
 $labels['savingdata'] = 'Saving data...';
 $labels['errorsaving'] = 'Failed to save changes.';
 $labels['operationfailed'] = 'The requested operation failed.';
 $labels['invalideventdates'] = 'Invalid dates entered! Please check your input.';
 $labels['invalidcalendarproperties'] = 'Invalid calendar properties! Please set a valid name.';
 $labels['searchnoresults'] = 'No events found in the selected calendars.';
 $labels['successremoval'] = 'The event has been deleted successfully.';
 $labels['successrestore'] = 'The event has been restored successfully.';
 $labels['errornotifying'] = 'Failed to send notifications to event participants';
 $labels['errorimportingevent'] = 'Failed to import the event';
 $labels['importwarningexists'] = 'A copy of this event already exists in your calendar.';
 $labels['newerversionexists'] = 'A newer version of this event already exists! Aborted.';
 $labels['nowritecalendarfound'] = 'No calendar found to save the event';
 $labels['importedsuccessfully'] = 'The event was successfully added to \'$calendar\'';
 $labels['updatedsuccessfully'] = 'The event was successfully updated in \'$calendar\'';
 $labels['attendeupdateesuccess'] = 'Successfully updated the participant\'s status';
 $labels['itipsendsuccess'] = 'Invitation sent to participants.';
 $labels['itipresponseerror'] = 'Failed to send the response to this event invitation';
 $labels['itipinvalidrequest'] = 'This invitation is no longer valid';
 $labels['sentresponseto'] = 'Successfully sent invitation response to $mailto';
 $labels['localchangeswarning'] = 'You are about to make changes that will only be reflected on your calendar and not be sent to the organizer of the event.';
 $labels['importsuccess'] = 'Successfully imported $nr events';
 $labels['importnone'] = 'No events found to be imported';
 $labels['importerror'] = 'An error occured while importing';
 $labels['aclnorights'] = 'You do not have administrator rights on this calendar.';
 
 $labels['changeeventconfirm'] = 'Change event';
 $labels['removeeventconfirm'] = 'Delete event';
 $labels['changerecurringeventwarning'] = 'This is a recurring event. Would you like to edit the current event only, this and all future occurences, all occurences or save it as a new event?';
 $labels['removerecurringeventwarning'] = 'This is a recurring event. Would you like to delete the current event only, this and all future occurences or all occurences of this event?';
 $labels['removerecurringallonly'] = 'This is a recurring event. As a participant, you can only delete the entire event with all occurences.';
 $labels['currentevent'] = 'Current';
 $labels['futurevents'] = 'Future';
 $labels['allevents'] = 'All';
 $labels['saveasnew'] = 'Save as new';
 
 // birthdays calendar
 $labels['birthdays'] = 'Birthdays';
 $labels['birthdayscalendar'] = 'Birthdays Calendar';
 $labels['displaybirthdayscalendar'] = 'Display birthdays calendar';
 $labels['birthdayscalendarsources'] = 'From these address books';
 $labels['birthdayeventtitle'] = '$name\'s Birthday';
 $labels['birthdayage'] = 'Age $age';
 
 // history dialog
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
 $labels['objectnotfound'] = 'Failed to load event data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this event';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
 $labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this event? This will replace the current event with the old version.';
 $labels['objectrestoresuccess'] = 'Revision $rev successfully restored';
 $labels['objectrestoreerror'] = 'Failed to restore the old revision';
 
 
 // (hidden) titles and labels for accessibility annotations
 $labels['arialabelminical'] = 'Calendar date selection';
 $labels['arialabelcalendarview'] = 'Calendar view';
 $labels['arialabelsearchform'] = 'Event search form';
 $labels['arialabelquicksearchbox'] = 'Event search input';
 $labels['arialabelcalsearchform'] = 'Calendars search form';
 $labels['calendaractions'] = 'Calendar actions';
 $labels['arialabeleventattendees'] = 'Event participants list';
 $labels['arialabeleventresources'] = 'Event resources list';
 $labels['arialabelresourcesearchform'] = 'Resources search form';
 $labels['arialabelresourceselection'] = 'Available resources';
 
 ?>
diff --git a/plugins/libcalendaring/libcalendaring.js b/plugins/libcalendaring/libcalendaring.js
index 62ff23b0..b327e815 100644
--- a/plugins/libcalendaring/libcalendaring.js
+++ b/plugins/libcalendaring/libcalendaring.js
@@ -1,1396 +1,1396 @@
 /**
  * Basic Javascript utilities for calendar-related plugins
  *
  * @author Thomas Bruederli <bruederli@kolabsys.com>
  *
  * @licstart  The following is the entire license notice for the
  * JavaScript code in this page.
  *
  * Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  *
  * @licend  The above is the entire license notice
  * for the JavaScript code in this page.
  */
 
 function rcube_libcalendaring(settings)
 {
     // member vars
     this.settings = settings || {};
     this.alarm_ids = [];
     this.alarm_dialog = null;
     this.snooze_popup = null;
     this.dismiss_link = null;
     this.group2expand = {};
 
     // abort if env isn't set
     if (!settings || !settings.date_format)
       return;
 
     // private vars
     var me = this;
     var gmt_offset = (new Date().getTimezoneOffset() / -60) - (settings.timezone || 0) - (settings.dst || 0);
     var client_timezone = new Date().getTimezoneOffset();
 
     // general datepicker settings
     var datepicker_settings = {
         // translate from fullcalendar format to datepicker format
         dateFormat: settings.date_format.replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
         firstDay : settings.first_day,
         dayNamesMin: settings.days_short,
         monthNames: settings.months,
         monthNamesShort: settings.months,
         changeMonth: false,
         showOtherMonths: true,
         selectOtherMonths: true
     };
 
 
     /**
      * Quote html entities
      */
     var Q = this.quote_html = function(str)
     {
       return String(str).replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
     };
 
     /**
      * Create a nice human-readable string for the date/time range
      */
     this.event_date_text = function(event, voice)
     {
       if (!event.start)
         return '';
       if (!event.end)
         event.end = event.start;
 
       var fromto, duration = event.end.getTime() / 1000 - event.start.getTime() / 1000,
         until = voice ? ' ' + rcmail.gettext('until','libcalendaring') + ' ' : ' — ';
       if (event.allDay) {
         fromto = this.format_datetime(event.start, 1, voice)
           + (duration > 86400 || event.start.getDay() != event.end.getDay() ? until + this.format_datetime(event.end, 1, voice) : '');
       }
       else if (duration < 86400 && event.start.getDay() == event.end.getDay()) {
         fromto = this.format_datetime(event.start, 0, voice)
           + (duration > 0 ? until + this.format_datetime(event.end, 2, voice) : '');
       }
       else {
         fromto = this.format_datetime(event.start, 0, voice)
           + (duration > 0 ? until + this.format_datetime(event.end, 0, voice) : '');
       }
 
       return fromto;
     };
 
 
     /**
      * From time and date strings to a real date object
      */
     this.parse_datetime = function(time, date)
     {
         // we use the utility function from datepicker to parse dates
         var date = date ? $.datepicker.parseDate(datepicker_settings.dateFormat, date, datepicker_settings) : new Date();
 
         var time_arr = time.replace(/\s*[ap][.m]*/i, '').replace(/0([0-9])/g, '$1').split(/[:.]/);
         if (!isNaN(time_arr[0])) {
             date.setHours(time_arr[0]);
         if (time.match(/p[.m]*/i) && date.getHours() < 12)
             date.setHours(parseInt(time_arr[0]) + 12);
         else if (time.match(/a[.m]*/i) && date.getHours() == 12)
             date.setHours(0);
       }
       if (!isNaN(time_arr[1]))
             date.setMinutes(time_arr[1]);
 
       return date;
     }
 
     /**
      * Convert an ISO 8601 formatted date string from the server into a Date object.
      * Timezone information will be ignored, the server already provides dates in user's timezone.
      */
     this.parseISO8601 = function(s)
     {
         // force d to be on check's YMD, for daylight savings purposes
         var fixDate = function(d, check) {
             if (+d) { // prevent infinite looping on invalid dates
                 while (d.getDate() != check.getDate()) {
                     d.setTime(+d + (d < check ? 1 : -1) * 3600000);
                 }
             }
         }
 
         // derived from http://delete.me.uk/2005/03/iso8601.html
         var m = s && s.match(/^([0-9]{4})(-([0-9]{2})(-([0-9]{2})([T ]([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z|(([-+])([0-9]{2})(:?([0-9]{2}))?))?)?)?)?$/);
         if (!m) {
             return null;
         }
 
         var date = new Date(m[1], 0, 2),
             check = new Date(m[1], 0, 2, 9, 0);
         if (m[3]) {
             date.setMonth(m[3] - 1);
             check.setMonth(m[3] - 1);
         }
         if (m[5]) {
             date.setDate(m[5]);
             check.setDate(m[5]);
         }
         fixDate(date, check);
         if (m[7]) {
             date.setHours(m[7]);
         }
         if (m[8]) {
             date.setMinutes(m[8]);
         }
         if (m[10]) {
             date.setSeconds(m[10]);
         }
         if (m[12]) {
             date.setMilliseconds(Number("0." + m[12]) * 1000);
         }
         fixDate(date, check);
 
         return date;
     }
 
     /**
      * Turn the given date into an ISO 8601 date string understandable by PHPs strtotime()
      */
     this.date2ISO8601 = function(date)
     {
         var zeropad = function(num) { return (num < 10 ? '0' : '') + num; };
 
         return date.getFullYear() + '-' + zeropad(date.getMonth()+1) + '-' + zeropad(date.getDate())
             + 'T' + zeropad(date.getHours()) + ':' + zeropad(date.getMinutes()) + ':' + zeropad(date.getSeconds());
     };
 
     /**
      * Format the given date object according to user's prefs
      */
     this.format_datetime = function(date, mode, voice)
     {
         var res = '';
         if (!mode || mode == 1) {
           res += $.datepicker.formatDate(voice ? 'MM d yy' : datepicker_settings.dateFormat, date, datepicker_settings);
         }
         if (!mode) {
             res += voice ? ' ' + rcmail.gettext('at','libcalendaring') + ' ' : ' ';
         }
         if (!mode || mode == 2) {
             res += this.format_time(date, voice);
         }
 
         return res;
     }
 
     /**
      * Clone from fullcalendar.js
      */
     this.format_time = function(date, voice)
     {
         var zeroPad = function(n) { return (n < 10 ? '0' : '') + n; }
         var formatters = {
             s   : function(d) { return d.getSeconds() },
             ss  : function(d) { return zeroPad(d.getSeconds()) },
             m   : function(d) { return d.getMinutes() },
             mm  : function(d) { return zeroPad(d.getMinutes()) },
             h   : function(d) { return d.getHours() % 12 || 12 },
             hh  : function(d) { return zeroPad(d.getHours() % 12 || 12) },
             H   : function(d) { return d.getHours() },
             HH  : function(d) { return zeroPad(d.getHours()) },
             t   : function(d) { return d.getHours() < 12 ? 'a' : 'p' },
             tt  : function(d) { return d.getHours() < 12 ? 'am' : 'pm' },
             T   : function(d) { return d.getHours() < 12 ? 'A' : 'P' },
             TT  : function(d) { return d.getHours() < 12 ? 'AM' : 'PM' }
         };
 
         var i, i2, c, formatter, res = '',
           format = voice ? settings['time_format'].replace(':',' ').replace('HH','H').replace('hh','h').replace('mm','m').replace('ss','s') : settings['time_format'];
         for (i=0; i < format.length; i++) {
             c = format.charAt(i);
             for (i2=Math.min(i+2, format.length); i2 > i; i2--) {
                 if (formatter = formatters[format.substring(i, i2)]) {
                     res += formatter(date);
                     i = i2 - 1;
                     break;
                 }
             }
             if (i2 == i) {
                 res += c;
             }
         }
 
         return res;
     }
 
     /**
      * Convert the given Date object into a unix timestamp respecting browser's and user's timezone settings
      */
     this.date2unixtime = function(date)
     {
         var dst_offset = (client_timezone - date.getTimezoneOffset()) * 60;  // adjust DST offset
         return Math.round(date.getTime()/1000 + gmt_offset * 3600 + dst_offset);
     }
 
     /**
      * Turn a unix timestamp value into a Date object
      */
     this.fromunixtime = function(ts)
     {
         ts -= gmt_offset * 3600;
         var date = new Date(ts * 1000),
             dst_offset = (client_timezone - date.getTimezoneOffset()) * 60;
         if (dst_offset)  // adjust DST offset
             date.setTime((ts + 3600) * 1000);
         return date;
     }
 
     /**
      * Simple plaintext to HTML converter, makig URLs clickable
      */
     this.text2html = function(str, maxlen, maxlines)
     {
         var html = Q(String(str));
 
         // limit visible text length
         if (maxlen) {
             var morelink = '<span>... <a href="#more" onclick="$(this).parent().hide().next().show();return false" class="morelink">'+rcmail.gettext('showmore','libcalendaring')+'</a></span><span style="display:none">',
                 lines = html.split(/\r?\n/),
                 words, out = '', len = 0;
 
             for (var i=0; i < lines.length; i++) {
                 len += lines[i].length;
                 if (maxlines && i == maxlines - 1) {
                     out += lines[i] + '\n' + morelink;
                     maxlen = html.length * 2;
                 }
                 else if (len > maxlen) {
                     len = out.length;
                     words = lines[i].split(' ');
                     for (var j=0; j < words.length; j++) {
                         len += words[j].length + 1;
                         out += words[j] + ' ';
                         if (len > maxlen) {
                             out += morelink;
                             maxlen = html.length * 2;
                             maxlines = 0;
                         }
                     }
                     out += '\n';
                 }
                 else
                     out += lines[i] + '\n';
             }
 
             if (maxlen > str.length)
                 out += '</span>';
 
             html = out;
         }
 
         // simple link parser (similar to rcube_string_replacer class in PHP)
         var utf_domain = '[^?&@"\'/\\(\\)\\s\\r\\t\\n]+\\.([^\x00-\x2f\x3b-\x40\x5b-\x60\x7b-\x7f]{2,}|xn--[a-z0-9]{2,})';
         var url1 = '.:;,', url2 = 'a-z0-9%=#@+?&/_~\\[\\]-';
         var link_pattern = new RegExp('([hf]t+ps?://)('+utf_domain+'(['+url1+']?['+url2+']+)*)', 'ig');
         var mailto_pattern = new RegExp('([^\\s\\n\\(\\);]+@'+utf_domain+')', 'ig');
         var link_replace = function(matches, p1, p2) {
           var title = '', text = p2;
           if (p2 && p2.length > 55) {
             text = p2.substr(0, 45) + '...' + p2.substr(-8);
             title = p1 + p2;
           }
           return '<a href="'+p1+p2+'" class="extlink" target="_blank" title="'+title+'">'+p1+text+'</a>'
         };
 
         return html
             .replace(link_pattern, link_replace)
             .replace(mailto_pattern, '<a href="mailto:$1">$1</a>')
             .replace(/(mailto:)([^"]+)"/g, '$1$2" onclick="rcmail.command(\'compose\', \'$2\');return false"')
             .replace(/\n/g, "<br/>");
     };
 
     this.init_alarms_edit = function(prefix, index)
     {
         var edit_type = $(prefix+' select.edit-alarm-type'),
           dom_id = edit_type.attr('id');
 
         // register events on alarm fields
         edit_type.change(function(){
             $(this).parent().find('span.edit-alarm-values')[(this.selectedIndex>0?'show':'hide')]();
         });
         $(prefix+' select.edit-alarm-offset').change(function(){
             var val = $(this).val(), parent = $(this).parent();
             parent.find('.edit-alarm-date, .edit-alarm-time')[val == '@' ? 'show' : 'hide']();
             parent.find('.edit-alarm-value').prop('disabled', val === '@' || val === '0');
             parent.find('.edit-alarm-related')[val == '@' ? 'hide' : 'show']();
         });
 
         $(prefix+' .edit-alarm-date').removeClass('hasDatepicker').removeAttr('id').datepicker(datepicker_settings);
 
         $(prefix).on('click', 'a.delete-alarm', function(e){
             if ($(this).closest('.edit-alarm-item').siblings().length > 0) {
                 $(this).closest('.edit-alarm-item').remove();
             }
             return false;
         });
 
         // set a unique id attribute and set label reference accordingly
         if ((index || 0) > 0 && dom_id) {
             dom_id += ':' + (new Date().getTime());
             edit_type.attr('id', dom_id);
             $(prefix+' label:first').attr('for', dom_id);
         }
 
         $(prefix).on('click', 'a.add-alarm', function(e){
             var i = $(this).closest('.edit-alarm-item').siblings().length + 1;
             var item = $(this).closest('.edit-alarm-item').clone(false)
               .removeClass('first')
               .appendTo(prefix);
 
               me.init_alarms_edit(prefix + ' .edit-alarm-item:eq(' + i + ')', i);
               $('select.edit-alarm-type, select.edit-alarm-offset', item).change();
               return false;
         });
     }
 
     this.set_alarms_edit = function(prefix, valarms)
     {
         $(prefix + ' .edit-alarm-item:gt(0)').remove();
 
         var i, alarm, domnode, val, offset;
         for (i=0; i < valarms.length; i++) {
           alarm = valarms[i];
           if (!alarm.action)
               alarm.action = 'DISPLAY';
 
           if (i == 0) {
               domnode = $(prefix + ' .edit-alarm-item').eq(0);
           }
           else {
               domnode = $(prefix + ' .edit-alarm-item').eq(0).clone(false).removeClass('first').appendTo(prefix);
               this.init_alarms_edit(prefix + ' .edit-alarm-item:eq(' + i + ')', i);
           }
 
           $('select.edit-alarm-type', domnode).val(alarm.action);
           $('select.edit-alarm-related', domnode).val(/END/i.test(alarm.related) ? 'end' : 'start');
 
           if (String(alarm.trigger).match(/@(\d+)/)) {
               var ondate = this.fromunixtime(parseInt(RegExp.$1));
               $('select.edit-alarm-offset', domnode).val('@');
               $('input.edit-alarm-value', domnode).val('');
               $('input.edit-alarm-date', domnode).val(this.format_datetime(ondate, 1));
               $('input.edit-alarm-time', domnode).val(this.format_datetime(ondate, 2));
           }
           else if (String(alarm.trigger).match(/^[-+]*0[MHDS]$/)) {
               $('input.edit-alarm-value', domnode).val('0');
               $('select.edit-alarm-offset', domnode).val('0');
           }
           else if (String(alarm.trigger).match(/([-+])(\d+)([MHDS])/)) {
               val = RegExp.$2; offset = ''+RegExp.$1+RegExp.$3;
               $('input.edit-alarm-value', domnode).val(val);
               $('select.edit-alarm-offset', domnode).val(offset);
           }
         }
 
         // set correct visibility by triggering onchange handlers
         $(prefix + ' select.edit-alarm-type, ' + prefix + ' select.edit-alarm-offset').change();
     };
 
     this.serialize_alarms = function(prefix)
     {
         var valarms = [];
 
         $(prefix + ' .edit-alarm-item').each(function(i, elem) {
             var val, offset, alarm = {
                     action: $('select.edit-alarm-type', elem).val(),
                     related: $('select.edit-alarm-related', elem).val()
                 };
 
             if (alarm.action) {
                 offset = $('select.edit-alarm-offset', elem).val();
                 if (offset == '@') {
                     alarm.trigger = '@' + me.date2unixtime(me.parse_datetime($('input.edit-alarm-time', elem).val(), $('input.edit-alarm-date', elem).val()));
                 }
                 else if (offset === '0') {
                     alarm.trigger = '0S';
                 }
                 else if (!isNaN((val = parseInt($('input.edit-alarm-value', elem).val()))) && val >= 0) {
                     alarm.trigger = offset[0] + val + offset[1];
                 }
 
                 valarms.push(alarm);
             }
         });
 
         return valarms;
     };
 
     // format time string
     var time_autocomplete_format = function(hour, minutes, start) {
         var time, diff, unit, duration = '', d = new Date();
 
         d.setHours(hour);
         d.setMinutes(minutes);
         time = me.format_time(d);
 
         if (start) {
             diff = Math.floor((d.getTime() - start.getTime()) / 60000);
             if (diff > 0) {
                 unit = 'm';
                 if (diff >= 60) {
                     unit = 'h';
                     diff = Math.round(diff / 3) / 20;
                 }
                 duration = ' (' + diff + unit + ')';
             }
         }
 
         return [time, duration];
     };
 
     var time_autocomplete_list = function(p, callback) {
         // Time completions
         var st, h, step = 15, result = [], now = new Date(),
             id = String(this.element.attr('id')),
             m = id.match(/^(.*)-(starttime|endtime)$/),
             start = (m && m[2] == 'endtime'
                 && (st = $('#' + m[1] + '-starttime').val())
                 && $('#' + m[1] + '-startdate').val() == $('#' + m[1] + '-enddate').val())
                 ? me.parse_datetime(st, '') : null,
             full = p.term - 1 > 0 || p.term.length > 1,
             hours = start ? start.getHours() : (full ? me.parse_datetime(p.term, '') : now).getHours(),
             minutes = hours * 60 + (full ? 0 : now.getMinutes()),
             min = Math.ceil(minutes / step) * step % 60,
             hour = Math.floor(Math.ceil(minutes / step) * step / 60);
 
         // list hours from 0:00 till now
         for (h = start ? start.getHours() : 0; h < hours; h++)
             result.push(time_autocomplete_format(h, 0, start));
 
         // list 15min steps for the next two hours
         for (; h < hour + 2 && h < 24; h++) {
             while (min < 60) {
                 result.push(time_autocomplete_format(h, min, start));
                 min += step;
             }
             min = 0;
         }
 
         // list the remaining hours till 23:00
         while (h < 24)
             result.push(time_autocomplete_format((h++), 0, start));
 
         return callback(result);
     };
 
     var time_autocomplete_open = function(event, ui) {
         // scroll to current time
         var $this = $(this),
             widget = $this.autocomplete('widget')
             menu = $this.data('ui-autocomplete').menu,
             amregex = /^(.+)(a[.m]*)/i,
             pmregex = /^(.+)(a[.m]*)/i,
             val = $(this).val().replace(amregex, '0:$1').replace(pmregex, '1:$1');
 
         widget.css('width', '10em');
 
         if (val === '')
             menu._scrollIntoView(widget.children('li:first'));
         else
             widget.children().each(function() {
                 var li = $(this),
                     html = li.children().first().html()
                         .replace(/\s+\(.+\)$/, '')
                         .replace(amregex, '0:$1')
                         .replace(pmregex, '1:$1');
 
                 if (html.indexOf(val) == 0)
                     menu._scrollIntoView(li);
             });
     };
 
     /**
      * Initializes time autocompletion
      */
     this.init_time_autocomplete = function(elem, props)
     {
         var default_props = {
                 delay: 100,
                 minLength: 1,
                 appendTo: props.container,
                 source: time_autocomplete_list,
                 open: time_autocomplete_open,
                 // change: time_autocomplete_change,
                 select: function(event, ui) {
                     $(this).val(ui.item[0]).change();
                     return false;
                 }
             };
 
         $(elem).attr('autocomplete', "off")
             .autocomplete($.extend(default_props, props))
             .click(function() {  // show drop-down upon clicks
                 $(this).autocomplete('search', $(this).val() ? $(this).val().replace(/\D.*/, "") : " ");
             });
 
         $(elem).data('ui-autocomplete')._renderItem = function(ul, item) {
             return $('<li>')
                 .data('ui-autocomplete-item', item)
                 .append('<a>' + item[0] + item[1] + '</a>')
                 .appendTo(ul);
         };
     };
 
     /*****  Alarms handling  *****/
 
     /**
      * Display a notification for the given pending alarms
      */
     this.display_alarms = function(alarms)
     {
         // clear old alert first
         if (this.alarm_dialog)
             this.alarm_dialog.dialog('destroy').remove();
 
         var i, actions, adismiss, asnooze, alarm, html,
             audio_alarms = [], records = [], event_ids = [], buttons = {};
 
         for (i=0; i < alarms.length; i++) {
             alarm = alarms[i];
             alarm.start = this.parseISO8601(alarm.start);
             alarm.end = this.parseISO8601(alarm.end);
 
             if (alarm.action == 'AUDIO') {
                 audio_alarms.push(alarm);
                 continue;
             }
 
             event_ids.push(alarm.id);
 
             html = '<h3 class="event-title">' + Q(alarm.title) + '</h3>';
             html += '<div class="event-section">' + Q(alarm.location || '') + '</div>';
             html += '<div class="event-section">' + Q(this.event_date_text(alarm)) + '</div>';
 
             adismiss = $('<a href="#" class="alarm-action-dismiss"></a>').html(rcmail.gettext('dismiss','libcalendaring')).click(function(e){
                 me.dismiss_link = $(this);
                 me.dismiss_alarm(me.dismiss_link.data('id'), 0, e);
             });
             asnooze = $('<a href="#" class="alarm-action-snooze"></a>').html(rcmail.gettext('snooze','libcalendaring')).click(function(e){
                 me.snooze_dropdown($(this), e);
                 e.stopPropagation();
                 return false;
             });
             actions = $('<div>').addClass('alarm-actions').append(adismiss.data('id', alarm.id)).append(asnooze.data('id', alarm.id));
 
             records.push($('<div>').addClass('alarm-item').html(html).append(actions));
         }
 
         if (audio_alarms.length)
             this.audio_alarms(audio_alarms);
 
         if (!records.length)
             return;
 
         this.alarm_dialog = $('<div>').attr('id', 'alarm-display').append(records);
 
         buttons[rcmail.gettext('close')] = function() {
             $(this).dialog('close');
         };
 
         buttons[rcmail.gettext('dismissall','libcalendaring')] = function(e) {
             // submit dismissed event_ids to server
             me.dismiss_alarm(me.alarm_ids.join(','), 0, e);
             $(this).dialog('close');
         };
 
         this.alarm_dialog.appendTo(document.body).dialog({
             modal: false,
             resizable: true,
             closeOnEscape: false,
             dialogClass: 'alarms',
             title: rcmail.gettext('alarmtitle','libcalendaring'),
             buttons: buttons,
             open: function() {
               setTimeout(function() {
                 me.alarm_dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
               }, 5);
             },
             close: function() {
               $('#alarm-snooze-dropdown').hide();
               $(this).dialog('destroy').remove();
               me.alarm_dialog = null;
               me.alarm_ids = null;
             },
             drag: function(event, ui) {
               $('#alarm-snooze-dropdown').hide();
             }
         });
 
         this.alarm_dialog.closest('div[role=dialog]').attr('role', 'alertdialog');
 
         this.alarm_ids = event_ids;
     };
 
     /**
      * Display a notification and play a sound for a set of alarms
      */
     this.audio_alarms = function(alarms)
     {
         var elem, txt = [],
             src = rcmail.assets_path('plugins/libcalendaring/alarm'),
             plugin = navigator.mimeTypes ? navigator.mimeTypes['audio/mp3'] : {};
 
         // first generate and display notification text
         $.each(alarms, function() { txt.push(this.title); });
 
         rcmail.display_message(rcmail.gettext('alarmtitle','libcalendaring') + ': ' + Q(txt.join(', ')), 'notice', 10000);
 
         // Internet Explorer does not support wav files,
         // support in other browsers depends on enabled plugins,
         // so we use wav as a fallback
         src += bw.ie || (plugin && plugin.enabledPlugin) ? '.mp3' : '.wav';
 
         // HTML5
         try {
             elem = $('<audio>').attr('src', src);
             elem.get(0).play();
         }
         // old method
         catch (e) {
             elem = $('<embed id="libcalsound" src="' + src + '" hidden=true autostart=true loop=false />');
             elem.appendTo($('body'));
             window.setTimeout("$('#libcalsound').remove()", 10000);
         }
     };
 
     /**
      * Show a drop-down menu with a selection of snooze times
      */
     this.snooze_dropdown = function(link, event)
     {
         if (!this.snooze_popup) {
             this.snooze_popup = $('#alarm-snooze-dropdown');
             // create popup if not found
             if (!this.snooze_popup.length) {
                 this.snooze_popup = $('<div>').attr('id', 'alarm-snooze-dropdown').addClass('popupmenu').appendTo(document.body);
                 this.snooze_popup.html(rcmail.env.snooze_select)
             }
             $('#alarm-snooze-dropdown a').click(function(e){
                 var time = String(this.href).replace(/.+#/, '');
                 me.dismiss_alarm($('#alarm-snooze-dropdown').data('id'), time, e);
                 return false;
             });
         }
 
         // hide visible popup
         if (this.snooze_popup.is(':visible') && this.snooze_popup.data('id') == link.data('id')) {
             rcmail.command('menu-close', 'alarm-snooze-dropdown', link.get(0), event);
             this.dismiss_link = null;
         }
         else {  // open popup below the clicked link
             rcmail.command('menu-open', 'alarm-snooze-dropdown', link.get(0), event);
             this.snooze_popup.data('id', link.data('id'));
             this.dismiss_link = link;
         }
     };
 
     /**
      * Dismiss or snooze alarms for the given event
      */
     this.dismiss_alarm = function(id, snooze, event)
     {
         rcmail.command('menu-close', 'alarm-snooze-dropdown', null, event);
         rcmail.http_post('utils/plugin.alarms', { action:'dismiss', data:{ id:id, snooze:snooze } });
 
         // remove dismissed alarm from list
         if (this.dismiss_link) {
             this.dismiss_link.closest('div.alarm-item').hide();
             var new_ids = jQuery.grep(this.alarm_ids, function(v){ return v != id; });
             if (new_ids.length)
                 this.alarm_ids = new_ids;
             else
                 this.alarm_dialog.dialog('close');
         }
 
         this.dismiss_link = null;
     };
 
 
     /*****  Recurrence form handling  *****/
 
     /**
      * Install event handlers on recurrence form elements
      */
     this.init_recurrence_edit = function(prefix)
     {
         // toggle recurrence frequency forms
         $('#edit-recurrence-frequency').change(function(e){
             var freq = $(this).val().toLowerCase();
             $('.recurrence-form').hide();
             if (freq) {
               $('#recurrence-form-'+freq).show();
               if (freq != 'rdate')
                 $('#recurrence-form-until').show();
             }
         });
         $('#recurrence-form-rdate input.button.add').click(function(e){
             var dt, dv = $('#edit-recurrence-rdate-input').val();
             if (dv && (dt = me.parse_datetime('12:00', dv))) {
                 me.add_rdate(dt);
                 me.sort_rdates();
                 $('#edit-recurrence-rdate-input').val('')
             }
             else {
                 $('#edit-recurrence-rdate-input').select();
             }
         });
         $('#edit-recurrence-rdates').on('click', 'a.delete', function(e){
             $(this).closest('li').remove();
             return false;
         });
 
         $('#edit-recurrence-enddate').datepicker(datepicker_settings).click(function(){ $("#edit-recurrence-repeat-until").prop('checked', true) });
         $('#edit-recurrence-repeat-times').change(function(e){ $('#edit-recurrence-repeat-count').prop('checked', true); });
         $('#edit-recurrence-rdate-input').datepicker(datepicker_settings);
     };
 
     /**
      * Set recurrence form according to the given event/task record
      */
     this.set_recurrence_edit = function(rec)
     {
         var recurrence = $('#edit-recurrence-frequency').val(rec.recurrence ? rec.recurrence.FREQ || (rec.recurrence.RDATE ? 'RDATE' : '') : '').change(),
             interval = $('.recurrence-form select.edit-recurrence-interval').val(rec.recurrence ? rec.recurrence.INTERVAL || 1 : 1),
             rrtimes = $('#edit-recurrence-repeat-times').val(rec.recurrence ? rec.recurrence.COUNT || 1 : 1),
             rrenddate = $('#edit-recurrence-enddate').val(rec.recurrence && rec.recurrence.UNTIL ? this.format_datetime(this.parseISO8601(rec.recurrence.UNTIL), 1) : '');
         $('.recurrence-form input.edit-recurrence-until:checked').prop('checked', false);
         $('#edit-recurrence-rdates').html('');
 
         var weekdays = ['SU','MO','TU','WE','TH','FR','SA'],
             rrepeat_id = '#edit-recurrence-repeat-forever';
         if      (rec.recurrence && rec.recurrence.COUNT) rrepeat_id = '#edit-recurrence-repeat-count';
         else if (rec.recurrence && rec.recurrence.UNTIL) rrepeat_id = '#edit-recurrence-repeat-until';
         $(rrepeat_id).prop('checked', true);
 
         if (rec.recurrence && rec.recurrence.BYDAY && rec.recurrence.FREQ == 'WEEKLY') {
             var wdays = rec.recurrence.BYDAY.split(',');
             $('input.edit-recurrence-weekly-byday').val(wdays);
         }
         if (rec.recurrence && rec.recurrence.BYMONTHDAY) {
             $('input.edit-recurrence-monthly-bymonthday').val(String(rec.recurrence.BYMONTHDAY).split(','));
             $('input.edit-recurrence-monthly-mode').val(['BYMONTHDAY']);
         }
         if (rec.recurrence && rec.recurrence.BYDAY && (rec.recurrence.FREQ == 'MONTHLY' || rec.recurrence.FREQ == 'YEARLY')) {
             var byday, section = rec.recurrence.FREQ.toLowerCase();
             if ((byday = String(rec.recurrence.BYDAY).match(/(-?[1-4])([A-Z]+)/))) {
                 $('#edit-recurrence-'+section+'-prefix').val(byday[1]);
                 $('#edit-recurrence-'+section+'-byday').val(byday[2]);
             }
             $('input.edit-recurrence-'+section+'-mode').val(['BYDAY']);
         }
         else if (rec.start) {
             $('#edit-recurrence-monthly-byday').val(weekdays[rec.start.getDay()]);
         }
         if (rec.recurrence && rec.recurrence.BYMONTH) {
             $('input.edit-recurrence-yearly-bymonth').val(String(rec.recurrence.BYMONTH).split(','));
         }
         else if (rec.start) {
             $('input.edit-recurrence-yearly-bymonth').val([String(rec.start.getMonth()+1)]);
         }
         if (rec.recurrence && rec.recurrence.RDATE) {
             $.each(rec.recurrence.RDATE, function(i,rdate){
                 me.add_rdate(me.parseISO8601(rdate));
             });
         }
     };
 
     /**
      * Gather recurrence settings from form
      */
     this.serialize_recurrence = function(timestr)
     {
         var recurrence = '',
             freq = $('#edit-recurrence-frequency').val();
 
         if (freq != '') {
             recurrence = {
                 FREQ: freq,
                 INTERVAL: $('#edit-recurrence-interval-'+freq.toLowerCase()).val()
             };
 
             var until = $('input.edit-recurrence-until:checked').val();
             if (until == 'count')
                 recurrence.COUNT = $('#edit-recurrence-repeat-times').val();
             else if (until == 'until')
                 recurrence.UNTIL = me.date2ISO8601(me.parse_datetime(timestr || '00:00', $('#edit-recurrence-enddate').val()));
 
             if (freq == 'WEEKLY') {
                 var byday = [];
                 $('input.edit-recurrence-weekly-byday:checked').each(function(){ byday.push(this.value); });
                 if (byday.length)
                     recurrence.BYDAY = byday.join(',');
             }
             else if (freq == 'MONTHLY') {
                 var mode = $('input.edit-recurrence-monthly-mode:checked').val(), bymonday = [];
                 if (mode == 'BYMONTHDAY') {
                     $('input.edit-recurrence-monthly-bymonthday:checked').each(function(){ bymonday.push(this.value); });
                     if (bymonday.length)
                         recurrence.BYMONTHDAY = bymonday.join(',');
                 }
                 else
                     recurrence.BYDAY = $('#edit-recurrence-monthly-prefix').val() + $('#edit-recurrence-monthly-byday').val();
             }
             else if (freq == 'YEARLY') {
                 var byday, bymonth = [];
                 $('input.edit-recurrence-yearly-bymonth:checked').each(function(){ bymonth.push(this.value); });
                 if (bymonth.length)
                     recurrence.BYMONTH = bymonth.join(',');
                 if ((byday = $('#edit-recurrence-yearly-byday').val()))
                     recurrence.BYDAY = $('#edit-recurrence-yearly-prefix').val() + byday;
             }
             else if (freq == 'RDATE') {
                 recurrence = { RDATE:[] };
                 // take selected but not yet added date into account
                 if ($('#edit-recurrence-rdate-input').val() != '') {
                     $('#recurrence-form-rdate input.button.add').click();
                 }
                 $('#edit-recurrence-rdates li').each(function(i, li){
                     recurrence.RDATE.push($(li).attr('data-value'));
                 });
             }
         }
 
         return recurrence;
     };
 
     // add the given date to the RDATE list
     this.add_rdate = function(date)
     {
         var li = $('<li>')
             .attr('data-value', this.date2ISO8601(date))
             .html('<span>' + Q(this.format_datetime(date, 1)) + '</span>')
             .appendTo('#edit-recurrence-rdates');
 
         $('<a>').attr('href', '#del')
             .addClass('iconbutton delete')
             .html(rcmail.get_label('delete', 'libcalendaring'))
             .attr('title', rcmail.get_label('delete', 'libcalendaring'))
             .appendTo(li);
     };
 
     // re-sort the list items by their 'data-value' attribute
     this.sort_rdates = function()
     {
         var mylist = $('#edit-recurrence-rdates'),
             listitems = mylist.children('li').get();
         listitems.sort(function(a, b) {
             var compA = $(a).attr('data-value');
             var compB = $(b).attr('data-value');
             return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
         })
         $.each(listitems, function(idx, item) { mylist.append(item); });
     };
 
 
     /*****  Attendee form handling  *****/
 
     // expand the given contact group into individual event/task attendees
     this.expand_attendee_group = function(e, add, remove)
     {
         var id = (e.data ? e.data.email : null) || $(e.target).attr('data-email'),
             role_select = $(e.target).closest('tr').find('select.edit-attendee-role option:selected');
 
         this.group2expand[id] = { link: e.target, data: $.extend({}, e.data || {}), adder: add, remover: remove }
 
         // copy group role from the according form element
         if (role_select.length) {
             this.group2expand[id].data.role = role_select.val();
         }
 
         // register callback handler
         if (!this._expand_attendee_listener) {
             this._expand_attendee_listener = this.expand_attendee_callback;
             rcmail.addEventListener('plugin.expand_attendee_callback', function(result) {
                 me._expand_attendee_listener(result);
             });
         }
 
         rcmail.http_post('libcal/plugin.expand_attendee_group', { id: id, data: e.data || {} }, rcmail.set_busy(true, 'loading'));
     };
 
     // callback from server to expand an attendee group
     this.expand_attendee_callback = function(result)
     {
         var attendee, id = result.id,
             data = this.group2expand[id],
             row = $(data.link).closest('tr');
 
         // replace group entry with all members returned by the server
         if (data && data.adder && result.members && result.members.length) {
             for (var i=0; i < result.members.length; i++) {
                 attendee = result.members[i];
                 attendee.role = data.data.role;
                 attendee.cutype = 'INDIVIDUAL';
                 attendee.status = 'NEEDS-ACTION';
                 data.adder(attendee, null, row);
             }
 
             if (data.remover) {
                 data.remover(data.link, id)
             }
             else {
                 row.remove();
             }
 
             delete this.group2expand[id];
         }
         else {
             rcmail.display_message(result.error || rcmail.gettext('expandattendeegroupnodata','libcalendaring'), 'error');
         }
     };
 
 
     // Render message reference links to the given container
     this.render_message_links = function(links, container, edit, plugin)
     {
         var ul = $('<ul>').addClass('attachmentslist');
 
         $.each(links, function(i, link) {
             if (!link.mailurl)
                 return true;  // continue
 
             var li = $('<li>').addClass('link')
                 .addClass('message eml')
                 .append($('<a>')
                     .attr('href', link.mailurl)
                     .addClass('messagelink')
                     .text(link.subject || link.uri)
                 )
                 .appendTo(ul);
 
             // add icon to remove the link
             if (edit) {
                 $('<a>')
                     .attr('href', '#delete')
                     .attr('title', rcmail.gettext('removelink', plugin))
                     .attr('data-uri', link.uri)
                     .addClass('delete')
                     .text(rcmail.gettext('delete'))
                     .appendTo(li);
             }
         });
 
         container.empty().append(ul);
     }
 }
 
 //////  static methods
 
 // render HTML code for displaying an attendee record
 rcube_libcalendaring.attendee_html = function(data)
 {
     var name, tooltip = '', context = 'libcalendaring',
         dispname = data.name || data.email,
         status = data.role == 'ORGANIZER' ? 'ORGANIZER' : data.status;
 
     if (status)
         status = status.toLowerCase();
 
     if (data.email) {
         tooltip = data.email;
         name = $('<a>').attr({href: 'mailto:' + data.email, 'class': 'mailtolink', 'data-cutype': data.cutype})
 
         if (status)
             tooltip += ' (' + rcmail.gettext('status' + status, context) + ')';
     }
     else {
         name = $('<span>');
     }
 
     if (data['delegated-to'])
-        tooltip = rcmail.gettext('delegatedto', context) + data['delegated-to'];
+        tooltip = rcmail.gettext('delegatedto', context) + ' ' + data['delegated-to'];
     else if (data['delegated-from'])
-        tooltip = rcmail.gettext('delegatedfrom', context) + data['delegated-from'];
+        tooltip = rcmail.gettext('delegatedfrom', context) + ' ' + data['delegated-from'];
 
     return $('<span>').append(
             $('<span>').attr({'class': 'attendee ' + status, title: tooltip}).append(name.text(dispname))
         ).html();
 };
 
 /**
  *
  */
 rcube_libcalendaring.add_from_itip_mail = function(mime_id, task, status, dom_id)
 {
     // ask user to delete the declined event from the local calendar (#1670)
     var del = false;
     if (rcmail.env.rsvp_saved && status == 'declined') {
         del = confirm(rcmail.gettext('itip.declinedeleteconfirm'));
     }
 
     // open dialog for iTip delegation
     if (status == 'delegated') {
         rcube_libcalendaring.itip_delegate_dialog(function(data) {
             rcmail.http_post(task + '/itip-delegate', {
                 _uid: rcmail.env.uid,
                 _mbox: rcmail.env.mailbox,
                 _part: mime_id,
                 _to: data.to,
                 _rsvp: data.rsvp ? 1 : 0,
                 _comment: data.comment,
                 _folder: data.target
             }, rcmail.set_busy(true, 'itip.savingdata'));
         }, $('#rsvp-'+dom_id+' .folder-select'));
         return false;
     }
 
     var noreply = 0, comment = '';
     if (dom_id) {
       noreply = $('#noreply-'+dom_id+':checked').length ? 1 : 0;
       if (!noreply)
         comment = $('#reply-comment-'+dom_id).val();
     }
 
     rcmail.http_post(task + '/mailimportitip', {
         _uid: rcmail.env.uid,
         _mbox: rcmail.env.mailbox,
         _part: mime_id,
         _folder: $('#itip-saveto').val(),
         _status: status,
         _del: del?1:0,
         _noreply: noreply,
         _comment: comment
       }, rcmail.set_busy(true, 'itip.savingdata'));
 
     return false;
 };
 
 /**
  * Helper function to render the iTip delegation dialog
  * and trigger a callback function when submitted.
  */
 rcube_libcalendaring.itip_delegate_dialog = function(callback, selector)
 {
     // show dialog for entering the delegatee address and comment
     var html = '<form class="itip-dialog-form" action="javascript:void()">' +
         '<div class="form-section">' +
             '<label for="itip-delegate-to">' + rcmail.gettext('itip.delegateto') + '</label><br/>' +
             '<input type="text" id="itip-delegate-to" class="text" size="40" value="" />' +
         '</div>' +
         '<div class="form-section">' +
             '<label for="itip-delegate-rsvp">' +
                 '<input type="checkbox" id="itip-delegate-rsvp" class="checkbox" size="40" value="" />' +
                 rcmail.gettext('itip.delegatersvpme') +
             '</label>' +
         '</div>' +
         '<div class="form-section">' +
             '<textarea id="itip-delegate-comment" class="itip-comment" cols="40" rows="8" placeholder="' +
                 rcmail.gettext('itip.itipcomment') + '"></textarea>' + 
         '</div>' +
         '<div class="form-section">' +
             (selector && selector.length ? selector.html() : '') +
         '</div>' +
     '</form>';
 
     var dialog, buttons = [];
     buttons.push({
         text: rcmail.gettext('itipdelegated', 'itip'),
         click: function() {
             var doc = window.parent.document,
                 delegatee = String($('#itip-delegate-to', doc).val()).replace(/(^\s+)|(\s+$)/, '');
 
             if (delegatee != '' && rcube_check_email(delegatee, true)) {
                 callback({
                     to: delegatee,
                     rsvp: $('#itip-delegate-rsvp', doc).prop('checked'),
                     comment: $('#itip-delegate-comment', doc).val(),
                     target: $('#itip-saveto', doc).val()
                 });
 
                 setTimeout(function() { dialog.dialog("close"); }, 500);
             }
             else {
                 alert(rcmail.gettext('itip.delegateinvalidaddress'));
                 $('#itip-delegate-to', doc).focus();
             }
         }
     });
 
     buttons.push({
         text: rcmail.gettext('cancel', 'itip'),
         click: function() {
             dialog.dialog('close');
         }
     });
 
     dialog = rcmail.show_popup_dialog(html, rcmail.gettext('delegateinvitation', 'itip'), buttons, {
         width: 460,
         open: function(event, ui) {
             $(this).parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().addClass('mainaction');
             $(this).find('#itip-saveto').val('');
 
             // initialize autocompletion
             var ac_props, rcm = rcmail.is_framed() ? parent.rcmail : rcmail;
             if (rcmail.env.autocomplete_threads > 0) {
                 ac_props = {
                     threads: rcmail.env.autocomplete_threads,
                     sources: rcmail.env.autocomplete_sources
                 };
             }
             rcm.init_address_input_events($(this).find('#itip-delegate-to').focus(), ac_props);
             rcm.env.recipients_delimiter = '';
         },
         close: function(event, ui) {
             rcm = rcmail.is_framed() ? parent.rcmail : rcmail;
             rcm.ksearch_blur();
             $(this).remove();
         }
     });
 
     return dialog;
 };
 
 /**
  * Show a menu for selecting the RSVP reply mode
  */
 rcube_libcalendaring.itip_rsvp_recurring = function(btn, callback)
 {
     var mnu = $('<ul></ul>').addClass('popupmenu libcal-rsvp-replymode');
 
     $.each(['all','current'/*,'future'*/], function(i, mode) {
         $('<li><a>' + rcmail.get_label('rsvpmode'+mode, 'libcalendaring') + '</a>')
         .addClass('ui-menu-item')
         .attr('rel', mode)
         .appendTo(mnu);
     });
 
     var action = btn.attr('rel');
 
     // open the mennu
     mnu.menu({
         select: function(event, ui) {
             callback(action, ui.item.attr('rel'));
         }
     })
     .appendTo(document.body)
     .position({ my: 'left top', at: 'left bottom+2', of: btn })
     .data('action', action);
 
     setTimeout(function() {
         $(document).one('click', function() {
             mnu.menu('destroy');
             mnu.remove();
         });
     }, 100);
 };
 
 /**
  *
  */
 rcube_libcalendaring.remove_from_itip = function(event, task, title)
 {
     if (confirm(rcmail.gettext('itip.deleteobjectconfirm').replace('$title', title))) {
         rcmail.http_post(task + '/itip-remove',
             event,
             rcmail.set_busy(true, 'itip.savingdata')
         );
     }
 };
 
 /**
  *
  */
 rcube_libcalendaring.decline_attendee_reply = function(mime_id, task)
 {
     // show dialog for entering a comment and send to server
     var html = '<div class="itip-dialog-confirm-text">' + rcmail.gettext('itip.declineattendeeconfirm') + '</div>' +
         '<textarea id="itip-decline-comment" class="itip-comment" cols="40" rows="8"></textarea>';
 
     var dialog, buttons = [];
     buttons.push({
         text: rcmail.gettext('declineattendee', 'itip'),
         click: function() {
             rcmail.http_post(task + '/itip-decline-reply', {
                 _uid: rcmail.env.uid,
                 _mbox: rcmail.env.mailbox,
                 _part: mime_id,
                 _comment: $('#itip-decline-comment', window.parent.document).val()
             }, rcmail.set_busy(true, 'itip.savingdata'));
           dialog.dialog("close");
         }
     });
 
     buttons.push({
         text: rcmail.gettext('cancel', 'itip'),
         click: function() {
           dialog.dialog('close');
         }
     });
 
     dialog = rcmail.show_popup_dialog(html, rcmail.gettext('declineattendee', 'itip'), buttons, {
         width: 460,
         open: function() {
             $(this).parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().addClass('mainaction');
             $('#itip-decline-comment').focus();
         }
     });
 
     return false;
 };
 
 /**
  *
  */
 rcube_libcalendaring.fetch_itip_object_status = function(p)
 {
   rcmail.http_post(p.task + '/itip-status', { data: p });
 };
 
 /**
  *
  */
 rcube_libcalendaring.update_itip_object_status = function(p)
 {
   rcmail.env.rsvp_saved = p.saved;
   rcmail.env.itip_existing = p.existing;
 
   // hide all elements first
   $('#itip-buttons-'+p.id+' > div').hide();
   $('#rsvp-'+p.id+' .folder-select').remove();
 
   if (p.html) {
     // append/replace rsvp status display
     $('#loading-'+p.id).next('.rsvp-status').remove();
     $('#loading-'+p.id).hide().after(p.html);
   }
 
   // enable/disable rsvp buttons
   if (p.action == 'rsvp') {
     $('#rsvp-'+p.id+' input.button').prop('disabled', false)
       .filter('.'+String(p.status||'unknown').toLowerCase()).prop('disabled', p.latest);
   }
  
   // show rsvp/import buttons (with calendar selector)
   $('#'+p.action+'-'+p.id).show().find('input.button').last().after(p.select);
 
   // show itip box appendix after replacing the given placeholders
   if (p.append && p.append.selector) {
     var elem = $(p.append.selector);
     if (p.append.replacements) {
       $.each(p.append.replacements, function(k, html) {
         elem.html(elem.html().replace(k, html));
       });
     }
     else if (p.append.html) {
       elem.html(p.append.html)
     }
     elem.show();
   }
 };
 
 /**
  * Callback from server after an iTip message has been processed
  */
 rcube_libcalendaring.itip_message_processed = function(metadata)
 {
   if (metadata.after_action) {
     setTimeout(function(){ rcube_libcalendaring.itip_after_action(metadata.after_action); }, 1200);
   }
   else {
     rcube_libcalendaring.fetch_itip_object_status(metadata);
   }
 };
 
 /**
  * After-action on iTip request message. Action types:
  *     0 - no action
  *     1 - move to Trash
  *     2 - delete the message
  *     3 - flag as deleted
  *     folder_name - move the message to the specified folder
  */
 rcube_libcalendaring.itip_after_action = function(action)
 {
   if (!action) {
     return;
   }
 
   var rc = rcmail.is_framed() ? parent.rcmail : rcmail;
 
   if (action === 2) {
     rc.permanently_remove_messages();
   }
   else if (action === 3) {
     rc.mark_message('delete');
   }
   else {
     rc.move_messages(action === 1 ? rc.env.trash_mailbox : action);
   }
 };
 
 /**
  * Open the calendar preview for the current iTip event
  */
 rcube_libcalendaring.open_itip_preview = function(url, msgref)
 {
   if (!rcmail.env.itip_existing)
     url += '&itip=' + escape(msgref);
 
   var win = rcmail.open_window(url);
 };
 
 
 // extend jQuery
 (function($){
   $.fn.serializeJSON = function(){
     var json = {};
     jQuery.map($(this).serializeArray(), function(n, i) {
       json[n['name']] = n['value'];
     });
     return json;
   };
 })(jQuery);
 
 
 /* libcalendaring plugin initialization */
 window.rcmail && rcmail.addEventListener('init', function(evt) {
   if (rcmail.env.libcal_settings) {
     var libcal = new rcube_libcalendaring(rcmail.env.libcal_settings);
     rcmail.addEventListener('plugin.display_alarms', function(alarms){ libcal.display_alarms(alarms); });
   }
 
   rcmail.addEventListener('plugin.update_itip_object_status', rcube_libcalendaring.update_itip_object_status)
     .addEventListener('plugin.fetch_itip_object_status', rcube_libcalendaring.fetch_itip_object_status)
     .addEventListener('plugin.itip_message_processed', rcube_libcalendaring.itip_message_processed);
 
   $('.rsvp-buttons').on('click', 'a.reply-comment-toggle', function(e){
     $(this).hide().parent().find('textarea').show().focus();
     return false;
   });
 
   if (rcmail.env.action == 'get-attachment' && rcmail.gui_objects['attachmentframe']) {
     rcmail.register_command('print-attachment', function() {
       var frame = rcmail.get_frame_window(rcmail.gui_objects['attachmentframe'].id);
       if (frame) frame.print();
     }, true);
   }
 
   if (rcmail.env.action == 'get-attachment' && rcmail.env.attachment_download_url) {
     rcmail.register_command('download-attachment', function() {
       rcmail.location_href(rcmail.env.attachment_download_url, window);
     }, true);
   }
 });
diff --git a/plugins/libcalendaring/libcalendaring.php b/plugins/libcalendaring/libcalendaring.php
index babbc3e1..36978cd1 100644
--- a/plugins/libcalendaring/libcalendaring.php
+++ b/plugins/libcalendaring/libcalendaring.php
@@ -1,1733 +1,1734 @@
 <?php
 
 /**
  * Library providing common functions for calendaring plugins
  *
  * Provides utility functions for calendar-related modules such as
  * - alarms display and dismissal
  * - attachment handling
  * - recurrence computation and UI elements
  * - ical parsing and exporting
  * - itip scheduling protocol
  *
  * @version @package_version@
  * @author Thomas Bruederli <bruederli@kolabsys.com>
  *
  * Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 class libcalendaring extends rcube_plugin
 {
     public $rc;
     public $timezone;
     public $gmt_offset;
     public $dst_active;
     public $timezone_offset;
     public $ical_parts = array();
     public $ical_message;
 
     public $defaults = array(
       'calendar_date_format'  => "yyyy-MM-dd",
       'calendar_date_short'   => "M-d",
       'calendar_date_long'    => "MMM d yyyy",
       'calendar_date_agenda'  => "ddd MM-dd",
       'calendar_time_format'  => "HH:mm",
       'calendar_first_day'    => 1,
       'calendar_first_hour'   => 6,
       'calendar_date_format_sets' => array(
         'yyyy-MM-dd' => array('MMM d yyyy',   'M-d',  'ddd MM-dd'),
         'dd-MM-yyyy' => array('d MMM yyyy',   'd-M',  'ddd dd-MM'),
         'yyyy/MM/dd' => array('MMM d yyyy',   'M/d',  'ddd MM/dd'),
         'MM/dd/yyyy' => array('MMM d yyyy',   'M/d',  'ddd MM/dd'),
         'dd/MM/yyyy' => array('d MMM yyyy',   'd/M',  'ddd dd/MM'),
         'dd.MM.yyyy' => array('dd. MMM yyyy', 'd.M',  'ddd dd.MM.'),
         'd.M.yyyy'   => array('d. MMM yyyy',  'd.M',  'ddd d.MM.'),
       ),
     );
 
     private static $instance;
 
     private $mail_ical_parser;
 
     /**
      * Singleton getter to allow direct access from other plugins
      */
     public static function get_instance()
     {
         return self::$instance;
     }
 
     /**
      * Required plugin startup method
      */
     public function init()
     {
         self::$instance = $this;
 
         $this->rc = rcube::get_instance();
 
         // set user's timezone
         try {
             $this->timezone = new DateTimeZone($this->rc->config->get('timezone', 'GMT'));
         }
         catch (Exception $e) {
             $this->timezone = new DateTimeZone('GMT');
         }
 
         $now = new DateTime('now', $this->timezone);
 
         $this->gmt_offset      = $now->getOffset();
         $this->dst_active      = $now->format('I');
         $this->timezone_offset = $this->gmt_offset / 3600 - $this->dst_active;
 
         $this->add_texts('localization/', false);
 
         // include client scripts and styles
         if ($this->rc->output) {
             // add hook to display alarms
             $this->add_hook('refresh', array($this, 'refresh'));
             $this->register_action('plugin.alarms', array($this, 'alarms_action'));
             $this->register_action('plugin.expand_attendee_group', array($this, 'expand_attendee_group'));
         }
 
         // proceed initialization in startup hook
         $this->add_hook('startup', array($this, 'startup'));
     }
 
     /**
      * Startup hook
      */
     public function startup($args)
     {
         if ($this->rc->output && $this->rc->output->type == 'html') {
             $this->rc->output->set_env('libcal_settings', $this->load_settings());
             $this->include_script('libcalendaring.js');
             $this->include_stylesheet($this->local_skin_path() . '/libcal.css');
 
-            $this->rc->output->add_label(
-                'libcalendaring.itipaccepted', 'libcalendaring.itiptentative', 'libcalendaring.itipdeclined',
-                'libcalendaring.itipdelegated', 'libcalendaring.expandattendeegroup', 'libcalendaring.expandattendeegroupnodata',
-                'libcalendaring.statusorganizer', 'libcalendaring.statusaccepted', 'libcalendaring.statusdeclined',
-                'libcalendaring.statusdelegated', 'libcalendaring.statusunknown', 'libcalendaring.statusneeds-action',
-                'libcalendaring.statustentative', 'libcalendaring.statuscompleted', 'libcalendaring.statusin-process'
+            $this->add_label(
+                'itipaccepted', 'itiptentative', 'itipdeclined',
+                'itipdelegated', 'expandattendeegroup', 'expandattendeegroupnodata',
+                'statusorganizer', 'statusaccepted', 'statusdeclined',
+                'statusdelegated', 'statusunknown', 'statusneeds-action',
+                'statustentative', 'statuscompleted', 'statusin-process',
+                'delegatedto', 'delegatedfrom'
             );
         }
 
         if ($args['task'] == 'mail') {
             if ($args['action'] == 'show' || $args['action'] == 'preview') {
                 $this->add_hook('message_load', array($this, 'mail_message_load'));
             }
         }
     }
 
     /**
      * Load iCalendar functions
      */
     public static function get_ical()
     {
         $self = self::get_instance();
         require_once($self->home . '/libvcalendar.php');
         return new libvcalendar();
     }
 
     /**
      * Load iTip functions
      */
     public static function get_itip($domain = 'libcalendaring')
     {
         $self = self::get_instance();
         require_once($self->home . '/lib/libcalendaring_itip.php');
         return new libcalendaring_itip($self, $domain);
     }
 
     /**
      * Load recurrence computation engine
      */
     public static function get_recurrence()
     {
         $self = self::get_instance();
         require_once($self->home . '/lib/libcalendaring_recurrence.php');
         return new libcalendaring_recurrence($self);
     }
 
     /**
      * Shift dates into user's current timezone
      *
      * @param mixed Any kind of a date representation (DateTime object, string or unix timestamp)
      * @return object DateTime object in user's timezone
      */
     public function adjust_timezone($dt, $dateonly = false)
     {
         if (is_numeric($dt))
             $dt = new DateTime('@'.$dt);
         else if (is_string($dt))
             $dt = rcube_utils::anytodatetime($dt);
 
         if ($dt instanceof DateTime && !($dt->_dateonly || $dateonly)) {
             $dt->setTimezone($this->timezone);
         }
 
         return $dt;
     }
 
 
     /**
      *
      */
     public function load_settings()
     {
         $this->date_format_defaults();
 
         $settings = array();
         $keys     = array('date_format', 'time_format', 'date_short', 'date_long');
 
         foreach ($keys as $key) {
             $settings[$key] = (string)$this->rc->config->get('calendar_' . $key, $this->defaults['calendar_' . $key]);
             $settings[$key] = str_replace('Y', 'y', $settings[$key]);
         }
 
         $settings['dates_long']  = str_replace(' yyyy', '[ yyyy]', $settings['date_long']) . "{ '&mdash;' " . $settings['date_long'] . '}';
         $settings['first_day']   = (int)$this->rc->config->get('calendar_first_day', $this->defaults['calendar_first_day']);
         $settings['timezone']    = $this->timezone_offset;
         $settings['dst']         = $this->dst_active;
 
         // localization
         $settings['days'] = array(
             $this->rc->gettext('sunday'),   $this->rc->gettext('monday'),
             $this->rc->gettext('tuesday'),  $this->rc->gettext('wednesday'),
             $this->rc->gettext('thursday'), $this->rc->gettext('friday'),
             $this->rc->gettext('saturday')
         );
         $settings['days_short'] = array(
             $this->rc->gettext('sun'), $this->rc->gettext('mon'),
             $this->rc->gettext('tue'), $this->rc->gettext('wed'),
             $this->rc->gettext('thu'), $this->rc->gettext('fri'),
             $this->rc->gettext('sat')
         );
         $settings['months'] = array(
             $this->rc->gettext('longjan'), $this->rc->gettext('longfeb'),
             $this->rc->gettext('longmar'), $this->rc->gettext('longapr'),
             $this->rc->gettext('longmay'), $this->rc->gettext('longjun'),
             $this->rc->gettext('longjul'), $this->rc->gettext('longaug'),
             $this->rc->gettext('longsep'), $this->rc->gettext('longoct'),
             $this->rc->gettext('longnov'), $this->rc->gettext('longdec')
         );
         $settings['months_short'] = array(
             $this->rc->gettext('jan'), $this->rc->gettext('feb'),
             $this->rc->gettext('mar'), $this->rc->gettext('apr'),
             $this->rc->gettext('may'), $this->rc->gettext('jun'),
             $this->rc->gettext('jul'), $this->rc->gettext('aug'),
             $this->rc->gettext('sep'), $this->rc->gettext('oct'),
             $this->rc->gettext('nov'), $this->rc->gettext('dec')
         );
         $settings['today'] = $this->rc->gettext('today');
 
         // define list of file types which can be displayed inline
         // same as in program/steps/mail/show.inc
         $settings['mimetypes'] = (array)$this->rc->config->get('client_mimetypes');
 
         return $settings;
     }
 
 
     /**
      * Helper function to set date/time format according to config and user preferences
      */
     private function date_format_defaults()
     {
         static $defaults = array();
 
         // nothing to be done
         if (isset($defaults['date_format']))
           return;
 
         $defaults['date_format'] = $this->rc->config->get('calendar_date_format', self::from_php_date_format($this->rc->config->get('date_format')));
         $defaults['time_format'] = $this->rc->config->get('calendar_time_format', self::from_php_date_format($this->rc->config->get('time_format')));
 
         // override defaults
         if ($defaults['date_format'])
             $this->defaults['calendar_date_format'] = $defaults['date_format'];
         if ($defaults['time_format'])
             $this->defaults['calendar_time_format'] = $defaults['time_format'];
 
         // derive format variants from basic date format
         $format_sets = $this->rc->config->get('calendar_date_format_sets', $this->defaults['calendar_date_format_sets']);
         if ($format_set = $format_sets[$this->defaults['calendar_date_format']]) {
             $this->defaults['calendar_date_long'] = $format_set[0];
             $this->defaults['calendar_date_short'] = $format_set[1];
             $this->defaults['calendar_date_agenda'] = $format_set[2];
         }
     }
 
     /**
      * Compose a date string for the given event
      */
     public function event_date_text($event, $tzinfo = false)
     {
         $fromto = '--';
 
         // handle task objects
         if ($event['_type'] == 'task' && is_object($event['due'])) {
             $date_format = $event['due']->_dateonly ? self::to_php_date_format($this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format'])) : null;
             $fromto = $this->rc->format_date($event['due'], $date_format, false);
 
             // add timezone information
             if ($fromto && $tzinfo && ($tzname = $this->timezone->getName())) {
                 $fromto .= ' (' . strtr($tzname, '_', ' ') . ')';
             }
 
             return $fromto;
         }
 
         // abort if no valid event dates are given
         if (!is_object($event['start']) || !is_a($event['start'], 'DateTime') || !is_object($event['end']) || !is_a($event['end'], 'DateTime')) {
             return $fromto;
         }
 
         $duration = $event['start']->diff($event['end'])->format('s');
 
         $this->date_format_defaults();
         $date_format = self::to_php_date_format($this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format']));
         $time_format = self::to_php_date_format($this->rc->config->get('calendar_time_format', $this->defaults['calendar_time_format']));
 
         if ($event['allday']) {
             $fromto = $this->rc->format_date($event['start'], $date_format);
             if (($todate = $this->rc->format_date($event['end'], $date_format)) != $fromto)
                 $fromto .= ' - ' . $todate;
         }
         else if ($duration < 86400 && $event['start']->format('d') == $event['end']->format('d')) {
             $fromto = $this->rc->format_date($event['start'], $date_format) . ' ' . $this->rc->format_date($event['start'], $time_format) .
                 ' - ' . $this->rc->format_date($event['end'], $time_format);
         }
         else {
             $fromto = $this->rc->format_date($event['start'], $date_format) . ' ' . $this->rc->format_date($event['start'], $time_format) .
                 ' - ' . $this->rc->format_date($event['end'], $date_format) . ' ' . $this->rc->format_date($event['end'], $time_format);
         }
 
         // add timezone information
         if ($tzinfo && ($tzname = $this->timezone->getName())) {
             $fromto .= ' (' . strtr($tzname, '_', ' ') . ')';
         }
 
         return $fromto;
     }
 
 
     /**
      * Render HTML form for alarm configuration
      */
     public function alarm_select($attrib, $alarm_types, $absolute_time = true)
     {
         unset($attrib['name']);
 
         $input_value = new html_inputfield(array('name' => 'alarmvalue[]', 'class' => 'edit-alarm-value', 'size' => 3));
         $input_date  = new html_inputfield(array('name' => 'alarmdate[]', 'class' => 'edit-alarm-date', 'size' => 10));
         $input_time  = new html_inputfield(array('name' => 'alarmtime[]', 'class' => 'edit-alarm-time', 'size' => 6));
         $select_type    = new html_select(array('name' => 'alarmtype[]', 'class' => 'edit-alarm-type', 'id' => $attrib['id']));
         $select_offset  = new html_select(array('name' => 'alarmoffset[]', 'class' => 'edit-alarm-offset'));
         $select_related = new html_select(array('name' => 'alarmrelated[]', 'class' => 'edit-alarm-related'));
         $object_type    = $attrib['_type'] ?: 'event';
 
         $select_type->add($this->gettext('none'), '');
         foreach ($alarm_types as $type)
             $select_type->add($this->gettext(strtolower("alarm{$type}option")), $type);
 
         foreach (array('-M','-H','-D','+M','+H','+D') as $trigger)
             $select_offset->add($this->gettext('trigger' . $trigger), $trigger);
 
         $select_offset->add($this->gettext('trigger0'), '0');
         if ($absolute_time)
             $select_offset->add($this->gettext('trigger@'), '@');
 
         $select_related->add($this->gettext('relatedstart'), 'start');
         $select_related->add($this->gettext('relatedend' . $object_type), 'end');
 
         // pre-set with default values from user settings
         $preset = self::parse_alarm_value($this->rc->config->get('calendar_default_alarm_offset', '-15M'));
         $hidden = array('style' => 'display:none');
         $html = html::span('edit-alarm-set',
             $select_type->show($this->rc->config->get('calendar_default_alarm_type', '')) . ' ' .
             html::span(array('class' => 'edit-alarm-values', 'style' => 'display:none'),
                 $input_value->show($preset[0]) . ' ' .
                 $select_offset->show($preset[1]) . ' ' .
                 $select_related->show() . ' ' .
                 $input_date->show('', $hidden) . ' ' .
                 $input_time->show('', $hidden)
             )
         );
 
         // TODO: support adding more alarms
         #$html .= html::a(array('href' => '#', 'id' => 'edit-alam-add', 'title' => $this->gettext('addalarm')),
         #  $attrib['addicon'] ? html::img(array('src' => $attrib['addicon'], 'alt' => 'add')) : '(+)');
 
         return $html;
     }
 
     /**
      * Get a list of email addresses of the given user (from login and identities)
      *
      * @param string User Email (default to current user)
      * @return array Email addresses related to the user
      */
     public function get_user_emails($user = null)
     {
         static $_emails = array();
 
         if (empty($user)) {
             $user = $this->rc->user->get_username();
         }
 
         // return cached result
         if (is_array($_emails[$user])) {
             return $_emails[$user];
         }
 
         $emails = array($user);
         $plugin = $this->rc->plugins->exec_hook('calendar_user_emails', array('emails' => $emails));
         $emails = array_map('strtolower', $plugin['emails']);
 
         // add all emails from the current user's identities
         if (!$plugin['abort'] && ($user == $this->rc->user->get_username())) {
             foreach ($this->rc->user->list_emails() as $identity) {
                 $emails[] = strtolower($identity['email']);
             }
         }
 
         $_emails[$user] = array_unique($emails);
         return $_emails[$user];
     }
 
     /**
      * Set the given participant status to the attendee matching the current user's identities
      *
      * @param array   Hash array with event struct
      * @param string  The PARTSTAT value to set
      * @return mixed  Email address of the updated attendee or False if none matching found
      */
     public function set_partstat(&$event, $status, $recursive = true)
     {
         $success = false;
         $emails = $this->get_user_emails();
         foreach ((array)$event['attendees'] as $i => $attendee) {
             if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
                 $event['attendees'][$i]['status'] = strtoupper($status);
                 $success = $attendee['email'];
             }
         }
 
         // apply partstat update to each existing exception
         if ($event['recurrence'] && is_array($event['recurrence']['EXCEPTIONS'])) {
             foreach ($event['recurrence']['EXCEPTIONS'] as $i => $exception) {
                 $this->set_partstat($event['recurrence']['EXCEPTIONS'][$i], $status, false);
             }
 
             // set link to top-level exceptions
             $event['exceptions'] = &$event['recurrence']['EXCEPTIONS'];
         }
 
         return $success;
     }
 
 
     /*********  Alarms handling  *********/
 
     /**
      * Helper function to convert alarm trigger strings
      * into two-field values (e.g. "-45M" => 45, "-M")
      */
     public static function parse_alarm_value($val)
     {
         if ($val[0] == '@') {
             return array(new DateTime($val));
         }
         else if (preg_match('/([+-]?)P?(T?\d+[HMSDW])+/', $val, $m) && preg_match_all('/T?(\d+)([HMSDW])/', $val, $m2, PREG_SET_ORDER)) {
             if ($m[1] == '')
                 $m[1] = '+';
             foreach ($m2 as $seg) {
                 $prefix = $seg[2] == 'D' || $seg[2] == 'W' ? 'P' : 'PT';
                 if ($seg[1] > 0) {  // ignore zero values
                     // convert seconds to minutes
                     if ($seg[2] == 'S') {
                         $seg[2] = 'M';
                         $seg[1] = max(1, round($seg[1]/60));
                     }
 
                     return array($seg[1], $m[1].$seg[2], $m[1].$seg[1].$seg[2], $m[1].$prefix.$seg[1].$seg[2]);
                 }
             }
 
             // return zero value nevertheless
             return array($seg[1], $m[1].$seg[2], $m[1].$seg[1].$seg[2], $m[1].$prefix.$seg[1].$seg[2]);
         }
 
         return false;
     }
 
     /**
      * Convert the alarms list items to be processed on the client
      */
     public static function to_client_alarms($valarms)
     {
         return array_map(function($alarm){
             if ($alarm['trigger'] instanceof DateTime) {
                 $alarm['trigger'] = '@' . $alarm['trigger']->format('U');
             }
             else if ($trigger = libcalendaring::parse_alarm_value($alarm['trigger'])) {
                 $alarm['trigger'] = $trigger[2];
             }
             return $alarm;
         }, (array)$valarms);
     }
 
     /**
      * Process the alarms values submitted by the client
      */
     public static function from_client_alarms($valarms)
     {
         return array_map(function($alarm){
             if ($alarm['trigger'][0] == '@') {
                 try {
                     $alarm['trigger'] = new DateTime($alarm['trigger']);
                     $alarm['trigger']->setTimezone(new DateTimeZone('UTC'));
                 }
                 catch (Exception $e) { /* handle this ? */ }
             }
             else if ($trigger = libcalendaring::parse_alarm_value($alarm['trigger'])) {
                 $alarm['trigger'] = $trigger[3];
             }
             return $alarm;
         }, (array)$valarms);
     }
 
     /**
      * Render localized text for alarm settings
      */
     public static function alarms_text($alarms)
     {
         if (is_array($alarms) && is_array($alarms[0])) {
             $texts = array();
             foreach ($alarms as $alarm) {
                 if ($text = self::alarm_text($alarm))
                     $texts[] = $text;
             }
 
             return join(', ', $texts);
         }
         else {
             return self::alarm_text($alarms);
         }
     }
 
     /**
      * Render localized text for a single alarm property
      */
     public static function alarm_text($alarm)
     {
         if (is_string($alarm)) {
             list($trigger, $action) = explode(':', $alarm);
         }
         else {
             $trigger = $alarm['trigger'];
             $action  = $alarm['action'];
             $related = $alarm['related'];
         }
 
         $text  = '';
         $rcube = rcube::get_instance();
 
         switch ($action) {
         case 'EMAIL':
             $text = $rcube->gettext('libcalendaring.alarmemail');
             break;
         case 'DISPLAY':
             $text = $rcube->gettext('libcalendaring.alarmdisplay');
             break;
         case 'AUDIO':
             $text = $rcube->gettext('libcalendaring.alarmaudio');
             break;
         }
 
         if ($trigger instanceof DateTime) {
             $text .= ' ' . $rcube->gettext(array(
                 'name' => 'libcalendaring.alarmat',
                 'vars' => array('datetime' => $rcube->format_date($trigger))
             ));
         }
         else if (preg_match('/@(\d+)/', $trigger, $m)) {
             $text .= ' ' . $rcube->gettext(array(
                 'name' => 'libcalendaring.alarmat',
                 'vars' => array('datetime' => $rcube->format_date($m[1]))
             ));
         }
         else if ($val = self::parse_alarm_value($trigger)) {
             $r = strtoupper($related ?: 'start') == 'END' ? 'end' : '';
             // TODO: for all-day events say 'on date of event at XX' ?
             if ($val[0] == 0) {
                 $text .= ' ' . $rcube->gettext('libcalendaring.triggerattime' . $r);
             }
             else {
                 $label = 'libcalendaring.trigger' . $r . $val[1];
                 $text .= ' ' . intval($val[0]) . ' ' . $rcube->gettext($label);
             }
         }
         else {
             return false;
         }
 
         return $text;
     }
 
     /**
      * Get the next alarm (time & action) for the given event
      *
      * @param array Record data
      * @return array Hash array with alarm time/type or null if no alarms are configured
      */
     public static function get_next_alarm($rec, $type = 'event')
     {
         if (!($rec['valarms'] || $rec['alarms']) || $rec['cancelled'] || $rec['status'] == 'CANCELLED')
             return null;
 
         if ($type == 'task') {
             $timezone = self::get_instance()->timezone;
             if ($rec['startdate'])
                 $rec['start'] = new DateTime($rec['startdate'] . ' ' . ($rec['starttime'] ?: '12:00'), $timezone);
             if ($rec['date'])
                 $rec[($rec['start'] ? 'end' : 'start')] = new DateTime($rec['date'] . ' ' . ($rec['time'] ?: '12:00'), $timezone);
         }
 
         if (!$rec['end'])
             $rec['end'] = $rec['start'];
 
         // support legacy format
         if (!$rec['valarms']) {
             list($trigger, $action) = explode(':', $rec['alarms'], 2);
             if ($alarm = self::parse_alarm_value($trigger)) {
                 $rec['valarms'] = array(array('action' => $action, 'trigger' => $alarm[3] ?: $alarm[0]));
             }
         }
 
         $expires  = new DateTime('now - 12 hours');
         $alarm_id = $rec['id'];  // alarm ID eq. record ID by default to keep backwards compatibility
 
         // handle multiple alarms
         $notify_at = null;
         foreach ($rec['valarms'] as $alarm) {
             $notify_time = null;
 
             if ($alarm['trigger'] instanceof DateTime) {
                 $notify_time = $alarm['trigger'];
             }
             else if (is_string($alarm['trigger'])) {
                 $refdate = $alarm['related'] == 'END' ? $rec['end'] : $rec['start'];
 
                 // abort if no reference date is available to compute notification time
                 if (!is_a($refdate, 'DateTime'))
                     continue;
 
                 // TODO: for all-day events, take start @ 00:00 as reference date ?
 
                 try {
                     $interval = new DateInterval(trim($alarm['trigger'], '+-'));
                     $interval->invert = $alarm['trigger'][0] == '-';
                     $notify_time = clone $refdate;
                     $notify_time->add($interval);
                 }
                 catch (Exception $e) {
                     rcube::raise_error($e, true);
                     continue;
                 }
             }
 
             if ($notify_time && (!$notify_at || ($notify_time > $notify_at && $notify_time > $expires))) {
                 $notify_at  = $notify_time;
                 $action     = $alarm['action'];
                 $alarm_prop = $alarm;
 
                 // generate a unique alarm ID if multiple alarms are set
                 if (count($rec['valarms']) > 1) {
                     $alarm_id = substr(md5($rec['id']), 0, 16) . '-' . $notify_at->format('Ymd\THis');
                 }
             }
         }
 
         return !$notify_at ? null : array(
             'time'   => $notify_at->format('U'),
             'action' => $action ? strtoupper($action) : 'DISPLAY',
             'id'     => $alarm_id,
             'prop'   => $alarm_prop,
         );
     }
 
     /**
      * Handler for keep-alive requests
      * This will check for pending notifications and pass them to the client
      */
     public function refresh($attr)
     {
         // collect pending alarms from all providers (e.g. calendar, tasks)
         $plugin = $this->rc->plugins->exec_hook('pending_alarms', array(
             'time' => time(),
             'alarms' => array(),
         ));
 
         if (!$plugin['abort'] && !empty($plugin['alarms'])) {
             // make sure texts and env vars are available on client
             $this->add_texts('localization/', true);
             $this->rc->output->add_label('close');
             $this->rc->output->set_env('snooze_select', $this->snooze_select());
             $this->rc->output->command('plugin.display_alarms', $this->_alarms_output($plugin['alarms']));
         }
     }
 
     /**
      * Handler for alarm dismiss/snooze requests
      */
     public function alarms_action()
     {
 //        $action = rcube_utils::get_input_value('action', rcube_utils::INPUT_GPC);
         $data  = rcube_utils::get_input_value('data', rcube_utils::INPUT_POST, true);
 
         $data['ids'] = explode(',', $data['id']);
         $plugin = $this->rc->plugins->exec_hook('dismiss_alarms', $data);
 
         if ($plugin['success'])
             $this->rc->output->show_message('successfullysaved', 'confirmation');
         else
             $this->rc->output->show_message('calendar.errorsaving', 'error');
     }
 
     /**
      * Generate reduced and streamlined output for pending alarms
      */
     private function _alarms_output($alarms)
     {
         $out = array();
         foreach ($alarms as $alarm) {
             $out[] = array(
                 'id'       => $alarm['id'],
                 'start'    => $alarm['start'] ? $this->adjust_timezone($alarm['start'])->format('c') : '',
                 'end'      => $alarm['end']   ? $this->adjust_timezone($alarm['end'])->format('c') : '',
                 'allDay'   => $alarm['allday'] == 1,
                 'action'   => $alarm['action'],
                 'title'    => $alarm['title'],
                 'location' => $alarm['location'],
                 'calendar' => $alarm['calendar'],
             );
         }
 
         return $out;
     }
 
     /**
      * Render a dropdown menu to choose snooze time
      */
     private function snooze_select($attrib = array())
     {
         $steps = array(
              5 => 'repeatinmin',
             10 => 'repeatinmin',
             15 => 'repeatinmin',
             20 => 'repeatinmin',
             30 => 'repeatinmin',
             60 => 'repeatinhr',
             120 => 'repeatinhrs',
             1440 => 'repeattomorrow',
             10080 => 'repeatinweek',
         );
 
         $items = array();
         foreach ($steps as $n => $label) {
             $items[] = html::tag('li', null, html::a(array('href' => "#" . ($n * 60), 'class' => 'active'),
                 $this->gettext(array('name' => $label, 'vars' => array('min' => $n % 60, 'hrs' => intval($n / 60))))));
         }
 
         return html::tag('ul', $attrib + array('class' => 'toolbarmenu'), join("\n", $items), html::$common_attrib);
     }
 
 
     /*********  Recurrence rules handling ********/
 
     /**
      * Render localized text describing the recurrence rule of an event
      */
     public function recurrence_text($rrule)
     {
         $limit     = 10;
         $exdates   = array();
         $format    = $this->rc->config->get('calendar_date_format', $this->defaults['calendar_date_format']);
         $format    = self::to_php_date_format($format);
         $format_fn = function($dt) use ($format) {
             return rcmail::get_instance()->format_date($dt, $format);
         };
 
         if (is_array($rrule['EXDATE']) && !empty($rrule['EXDATE'])) {
             $exdates = array_map($format_fn, $rrule['EXDATE']);
         }
 
         if (empty($rrule['FREQ']) && !empty($rrule['RDATE'])) {
             $rdates = array_map($format_fn, $rrule['RDATE']);
 
             if (!empty($exdates)) {
                 $rdates = array_diff($rdates, $exdates);
             }
 
             if (count($rdates) > $limit) {
                 $rdates = array_slice($rdates, 0, $limit);
                 $more   = true;
             }
 
             return $this->gettext('ondate') . ' ' . join(', ', $rdates)
                 . ($more ? '...' : '');
         }
 
         $output  = sprintf('%s %d ', $this->gettext('every'), $rrule['INTERVAL'] ?: 1);
 
         switch ($rrule['FREQ']) {
         case 'DAILY':
             $output .= $this->gettext('days');
             break;
         case 'WEEKLY':
             $output .= $this->gettext('weeks');
             break;
         case 'MONTHLY':
             $output .= $this->gettext('months');
             break;
         case 'YEARLY':
             $output .= $this->gettext('years');
             break;
         }
 
         if ($rrule['COUNT']) {
             $until = $this->gettext(array('name' => 'forntimes', 'vars' => array('nr' => $rrule['COUNT'])));
         }
         else if ($rrule['UNTIL']) {
             $until = $this->gettext('recurrencend') . ' ' . $this->rc->format_date($rrule['UNTIL'], $format);
         }
         else {
             $until = $this->gettext('forever');
         }
 
         $output .= ', ' . $until;
 
         if (!empty($exdates)) {
             if (count($exdates) > $limit) {
                 $exdates = array_slice($exdates, 0, $limit);
                 $more    = true;
             }
 
             $output  = '; ' . $this->gettext('except') . ' ' . join(', ', $exdates)
                 . ($more ? '...' : '');
         }
 
         return $output;
     }
 
     /**
      * Generate the form for recurrence settings
      */
     public function recurrence_form($attrib = array())
     {
         switch ($attrib['part']) {
             // frequency selector
             case 'frequency':
                 $select = new html_select(array('name' => 'frequency', 'id' => 'edit-recurrence-frequency'));
                 $select->add($this->gettext('never'),   '');
                 $select->add($this->gettext('daily'),   'DAILY');
                 $select->add($this->gettext('weekly'),  'WEEKLY');
                 $select->add($this->gettext('monthly'), 'MONTHLY');
                 $select->add($this->gettext('yearly'),  'YEARLY');
                 $select->add($this->gettext('rdate'),   'RDATE');
                 $html = html::label('edit-recurrence-frequency', $this->gettext('frequency')) . $select->show('');
                 break;
 
             // daily recurrence
             case 'daily':
                 $select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-daily'));
                 $html = html::div($attrib, html::label('edit-recurrence-interval-daily', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('days')));
                 break;
 
             // weekly recurrence form
             case 'weekly':
                 $select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-weekly'));
                 $html = html::div($attrib, html::label('edit-recurrence-interval-weekly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('weeks')));
                 // weekday selection
                 $daymap = array('sun','mon','tue','wed','thu','fri','sat');
                 $checkbox = new html_checkbox(array('name' => 'byday', 'class' => 'edit-recurrence-weekly-byday'));
                 $first = $this->rc->config->get('calendar_first_day', 1);
                 for ($weekdays = '', $j = $first; $j <= $first+6; $j++) {
                     $d = $j % 7;
                     $weekdays .= html::label(array('class' => 'weekday'),
                         $checkbox->show('', array('value' => strtoupper(substr($daymap[$d], 0, 2)))) .
                         $this->gettext($daymap[$d])
                     ) . ' ';
                 }
                 $html .= html::div($attrib, html::label(null, $this->gettext('bydays')) . $weekdays);
                 break;
 
             // monthly recurrence form
             case 'monthly':
                 $select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-monthly'));
                 $html = html::div($attrib, html::label('edit-recurrence-interval-monthly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('months')));
 
                 $checkbox = new html_checkbox(array('name' => 'bymonthday', 'class' => 'edit-recurrence-monthly-bymonthday'));
                 for ($monthdays = '', $d = 1; $d <= 31; $d++) {
                     $monthdays .= html::label(array('class' => 'monthday'), $checkbox->show('', array('value' => $d)) . $d);
                     $monthdays .= $d % 7 ? ' ' : html::br();
                 }
 
                 // rule selectors
                 $radio = new html_radiobutton(array('name' => 'repeatmode', 'class' => 'edit-recurrence-monthly-mode'));
                 $table = new html_table(array('cols' => 2, 'border' => 0, 'cellpadding' => 0, 'class' => 'formtable'));
                 $table->add('label', html::label(null, $radio->show('BYMONTHDAY', array('value' => 'BYMONTHDAY')) . ' ' . $this->gettext('each')));
                 $table->add(null, $monthdays);
                 $table->add('label', html::label(null, $radio->show('', array('value' => 'BYDAY')) . ' ' . $this->gettext('onevery')));
                 $table->add(null, $this->rrule_selectors($attrib['part']));
 
                 $html .= html::div($attrib, $table->show());
                 break;
 
             // annually recurrence form
             case 'yearly':
                 $select = $this->interval_selector(array('name' => 'interval', 'class' => 'edit-recurrence-interval', 'id' => 'edit-recurrence-interval-yearly'));
                 $html = html::div($attrib, html::label('edit-recurrence-interval-yearly', $this->gettext('every')) . $select->show(1) . html::span('label-after', $this->gettext('years')));
                 // month selector
                 $monthmap = array('','jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec');
                 $checkbox = new html_checkbox(array('name' => 'bymonth', 'class' => 'edit-recurrence-yearly-bymonth'));
                 for ($months = '', $m = 1; $m <= 12; $m++) {
                     $months .= html::label(array('class' => 'month'), $checkbox->show(null, array('value' => $m)) . $this->gettext($monthmap[$m]));
                     $months .= $m % 4 ? ' ' : html::br();
                 }
                 $html .= html::div($attrib + array('id' => 'edit-recurrence-yearly-bymonthblock'), $months);
 
                 // day rule selection
                 $html .= html::div($attrib, html::label(null, $this->gettext('onevery')) . $this->rrule_selectors($attrib['part'], '---'));
                 break;
 
             // end of recurrence form
             case 'until':
                 $radio = new html_radiobutton(array('name' => 'repeat', 'class' => 'edit-recurrence-until'));
                 $select = $this->interval_selector(array('name' => 'times', 'id' => 'edit-recurrence-repeat-times'));
                 $input = new html_inputfield(array('name' => 'untildate', 'id' => 'edit-recurrence-enddate', 'size' => "10"));
 
                 $html = html::div('line first',
                     html::label(null, $radio->show('', array('value' => '', 'id' => 'edit-recurrence-repeat-forever')) . ' ' .
                         $this->gettext('forever'))
                 );
 
                 $forntimes = $this->gettext(array(
                     'name' => 'forntimes',
                     'vars' => array('nr' => '%s'))
                 );
                 $html .= html::div('line',
                     $radio->show('', array('value' => 'count', 'id' => 'edit-recurrence-repeat-count', 'aria-label' => sprintf($forntimes, 'N'))) . ' ' .
                         sprintf($forntimes, $select->show(1))
                 );
 
                 $html .= html::div('line',
                     $radio->show('', array('value' => 'until', 'id' => 'edit-recurrence-repeat-until', 'aria-label' => $this->gettext('untilenddate'))) . ' ' .
                         $this->gettext('untildate') . ' ' . $input->show('', array('aria-label' => $this->gettext('untilenddate')))
                 );
 
                 $html = html::div($attrib, html::label(null, ucfirst($this->gettext('recurrencend'))) . $html);
                 break;
 
             case 'rdate':
                 $ul = html::tag('ul', array('id' => 'edit-recurrence-rdates'), '');
                 $input = new html_inputfield(array('name' => 'rdate', 'id' => 'edit-recurrence-rdate-input', 'size' => "10"));
                 $button = new html_inputfield(array('type' => 'button', 'class' => 'button add', 'value' => $this->gettext('addrdate')));
                 $html .= html::div($attrib, $ul . html::div('inputform', $input->show() . $button->show()));
                 break;
         }
 
         return $html;
     }
 
     /**
      * Input field for interval selection
      */
     private function interval_selector($attrib)
     {
         $select = new html_select($attrib);
         $select->add(range(1,30), range(1,30));
         return $select;
     }
 
     /**
      * Drop-down menus for recurrence rules like "each last sunday of"
      */
     private function rrule_selectors($part, $noselect = null)
     {
         // rule selectors
         $select_prefix = new html_select(array('name' => 'bydayprefix', 'id' => "edit-recurrence-$part-prefix"));
         if ($noselect) $select_prefix->add($noselect, '');
         $select_prefix->add(array(
                 $this->gettext('first'),
                 $this->gettext('second'),
                 $this->gettext('third'),
                 $this->gettext('fourth'),
                 $this->gettext('last')
             ),
             array(1, 2, 3, 4, -1));
 
         $select_wday = new html_select(array('name' => 'byday', 'id' => "edit-recurrence-$part-byday"));
         if ($noselect) $select_wday->add($noselect, '');
 
         $daymap = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
         $first = $this->rc->config->get('calendar_first_day', 1);
         for ($j = $first; $j <= $first+6; $j++) {
             $d = $j % 7;
             $select_wday->add($this->gettext($daymap[$d]), strtoupper(substr($daymap[$d], 0, 2)));
         }
 
         return $select_prefix->show() . '&nbsp;' . $select_wday->show();
     }
 
     /**
      * Convert the recurrence settings to be processed on the client
      */
     public function to_client_recurrence($recurrence, $allday = false)
     {
         if ($recurrence['UNTIL'])
             $recurrence['UNTIL'] = $this->adjust_timezone($recurrence['UNTIL'], $allday)->format('c');
 
         // format RDATE values
         if (is_array($recurrence['RDATE'])) {
             $libcal = $this;
             $recurrence['RDATE'] = array_map(function($rdate) use ($libcal) {
                 return $libcal->adjust_timezone($rdate, true)->format('c');
             }, $recurrence['RDATE']);
         }
 
         unset($recurrence['EXCEPTIONS']);
 
         return $recurrence;
     }
 
     /**
      * Process the alarms values submitted by the client
      */
     public function from_client_recurrence($recurrence, $start = null)
     {
         if (is_array($recurrence) && !empty($recurrence['UNTIL'])) {
             $recurrence['UNTIL'] = new DateTime($recurrence['UNTIL'], $this->timezone);
         }
 
         if (is_array($recurrence) && is_array($recurrence['RDATE'])) {
             $tz = $this->timezone;
             $recurrence['RDATE'] = array_map(function($rdate) use ($tz, $start) {
                 try {
                     $dt = new DateTime($rdate, $tz);
                     if (is_a($start, 'DateTime'))
                         $dt->setTime($start->format('G'), $start->format('i'));
                     return $dt;
                 }
                 catch (Exception $e) {
                     return null;
                 }
             }, $recurrence['RDATE']);
         }
 
         return $recurrence;
     }
 
 
     /*********  Attachments handling  *********/
 
     /**
      * Handler for attachment uploads
      */
     public function attachment_upload($session_key, $id_prefix = '')
     {
         // Upload progress update
         if (!empty($_GET['_progress'])) {
             $this->rc->upload_progress();
         }
 
         $recid = $id_prefix . rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC);
         $uploadid = rcube_utils::get_input_value('_uploadid', rcube_utils::INPUT_GPC);
 
         if (!is_array($_SESSION[$session_key]) || $_SESSION[$session_key]['id'] != $recid) {
             $_SESSION[$session_key] = array();
             $_SESSION[$session_key]['id'] = $recid;
             $_SESSION[$session_key]['attachments'] = array();
         }
 
         // clear all stored output properties (like scripts and env vars)
         $this->rc->output->reset();
 
         if (is_array($_FILES['_attachments']['tmp_name'])) {
             foreach ($_FILES['_attachments']['tmp_name'] as $i => $filepath) {
               // Process uploaded attachment if there is no error
               $err = $_FILES['_attachments']['error'][$i];
 
               if (!$err) {
                 $attachment = array(
                     'path' => $filepath,
                     'size' => $_FILES['_attachments']['size'][$i],
                     'name' => $_FILES['_attachments']['name'][$i],
                     'mimetype' => rcube_mime::file_content_type($filepath, $_FILES['_attachments']['name'][$i], $_FILES['_attachments']['type'][$i]),
                     'group' => $recid,
                 );
 
                 $attachment = $this->rc->plugins->exec_hook('attachment_upload', $attachment);
               }
 
               if (!$err && $attachment['status'] && !$attachment['abort']) {
                   $id = $attachment['id'];
 
                   // store new attachment in session
                   unset($attachment['status'], $attachment['abort']);
                   $_SESSION[$session_key]['attachments'][$id] = $attachment;
 
                   if (($icon = $_SESSION[$session_key . '_deleteicon']) && is_file($icon)) {
                       $button = html::img(array(
                           'src' => $icon,
                           'alt' => $this->rc->gettext('delete')
                       ));
                   }
                   else {
                       $button = rcube::Q($this->rc->gettext('delete'));
                   }
 
                   $content = html::a(array(
                       'href' => "#delete",
                       'class' => 'delete',
                       'onclick' => sprintf("return %s.remove_from_attachment_list('rcmfile%s')", rcmail_output::JS_OBJECT_NAME, $id),
                       'title' => $this->rc->gettext('delete'),
                       'aria-label' => $this->rc->gettext('delete') . ' ' . $attachment['name'],
                   ), $button);
 
                   $content .= rcube::Q($attachment['name']);
 
                   $this->rc->output->command('add2attachment_list', "rcmfile$id", array(
                       'html' => $content,
                       'name' => $attachment['name'],
                       'mimetype' => $attachment['mimetype'],
                       'classname' => rcube_utils::file2class($attachment['mimetype'], $attachment['name']),
                       'complete' => true), $uploadid);
               }
               else {  // upload failed
                   if ($err == UPLOAD_ERR_INI_SIZE || $err == UPLOAD_ERR_FORM_SIZE) {
                     $msg = $this->rc->gettext(array('name' => 'filesizeerror', 'vars' => array(
                         'size' => $this->rc->show_bytes(parse_bytes(ini_get('upload_max_filesize'))))));
                   }
                   else if ($attachment['error']) {
                       $msg = $attachment['error'];
                   }
                   else {
                       $msg = $this->rc->gettext('fileuploaderror');
                   }
 
                   $this->rc->output->command('display_message', $msg, 'error');
                   $this->rc->output->command('remove_from_attachment_list', $uploadid);
                 }
             }
         }
         else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             // if filesize exceeds post_max_size then $_FILES array is empty,
             // show filesizeerror instead of fileuploaderror
             if ($maxsize = ini_get('post_max_size'))
                 $msg = $this->rc->gettext(array('name' => 'filesizeerror', 'vars' => array(
                     'size' => $this->rc->show_bytes(parse_bytes($maxsize)))));
             else
                 $msg = $this->rc->gettext('fileuploaderror');
 
             $this->rc->output->command('display_message', $msg, 'error');
             $this->rc->output->command('remove_from_attachment_list', $uploadid);
         }
 
         $this->rc->output->send('iframe');
     }
 
 
     /**
      * Deliver an event/task attachment to the client
      * (similar as in Roundcube core program/steps/mail/get.inc)
      */
     public function attachment_get($attachment)
     {
         ob_end_clean();
 
         if ($attachment && $attachment['body']) {
             // allow post-processing of the attachment body
             $part = new rcube_message_part;
             $part->filename  = $attachment['name'];
             $part->size      = $attachment['size'];
             $part->mimetype  = $attachment['mimetype'];
 
             $plugin = $this->rc->plugins->exec_hook('message_part_get', array(
                 'body'     => $attachment['body'],
                 'mimetype' => strtolower($attachment['mimetype']),
                 'download' => !empty($_GET['_download']),
                 'part'     => $part,
             ));
 
             if ($plugin['abort'])
                 exit;
 
             $mimetype = $plugin['mimetype'];
             list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
 
             $browser = $this->rc->output->browser;
 
             // send download headers
             if ($plugin['download']) {
                 header("Content-Type: application/octet-stream");
                 if ($browser->ie)
                     header("Content-Type: application/force-download");
             }
             else if ($ctype_primary == 'text') {
                 header("Content-Type: text/$ctype_secondary");
             }
             else {
                 header("Content-Type: $mimetype");
                 header("Content-Transfer-Encoding: binary");
             }
 
             // display page, @TODO: support text/plain (and maybe some other text formats)
             if ($mimetype == 'text/html' && empty($_GET['_download'])) {
                 $OUTPUT = new rcmail_html_page();
                 // @TODO: use washtml on $body
                 $OUTPUT->write($plugin['body']);
             }
             else {
                 // don't kill the connection if download takes more than 30 sec.
                 @set_time_limit(0);
 
                 $filename = $attachment['name'];
                 $filename = preg_replace('[\r\n]', '', $filename);
 
                 if ($browser->ie && $browser->ver < 7)
                     $filename = rawurlencode(abbreviate_string($filename, 55));
                 else if ($browser->ie)
                     $filename = rawurlencode($filename);
                 else
                     $filename = addcslashes($filename, '"');
 
                 $disposition = !empty($_GET['_download']) ? 'attachment' : 'inline';
                 header("Content-Disposition: $disposition; filename=\"$filename\"");
 
                 echo $plugin['body'];
             }
 
             exit;
         }
 
         // if we arrive here, the requested part was not found
         header('HTTP/1.1 404 Not Found');
         exit;
     }
 
     /**
      * Show "loading..." page in attachment iframe
      */
     public function attachment_loading_page()
     {
         $url = str_replace('&_preload=1', '', $_SERVER['REQUEST_URI']);
         $message = $this->rc->gettext('loadingdata');
 
         header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
         print "<html>\n<head>\n"
             . '<meta http-equiv="refresh" content="0; url='.rcube::Q($url).'">' . "\n"
             . '<meta http-equiv="content-type" content="text/html; charset='.RCUBE_CHARSET.'">' . "\n"
             . "</head>\n<body>\n$message\n</body>\n</html>";
         exit;
     }
 
     /**
      * Template object for attachment display frame
      */
     public function attachment_frame($attrib = array())
     {
         $mimetype = strtolower($this->attachment['mimetype']);
         list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
 
         $attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary == 'text' ? '_show=' : '_preload='), $_SERVER['QUERY_STRING']);
 
         $this->rc->output->add_gui_object('attachmentframe', $attrib['id']);
 
         return html::iframe($attrib);
     }
 
     /**
      *
      */
     public function attachment_header($attrib = array())
     {
         $rcmail = rcmail::get_instance();
         $dl_link = strtolower($attrib['downloadlink']) == 'true';
         $dl_url = $this->rc->url(array('_frame' => null, '_download' => 1) + $_GET);
 
         $table = new html_table(array('cols' => $dl_link ? 3 : 2));
 
         if (!empty($this->attachment['name'])) {
             $table->add('title', rcube::Q($this->rc->gettext('filename')));
             $table->add('header', rcube::Q($this->attachment['name']));
             if ($dl_link) {
                 $table->add('download-link', html::a($dl_url, rcube::Q($this->rc->gettext('download'))));
             }
         }
 
         if (!empty($this->attachment['mimetype'])) {
             $table->add('title', rcube::Q($this->rc->gettext('type')));
             $table->add('header', rcube::Q($this->attachment['mimetype']));
         }
 
         if (!empty($this->attachment['size'])) {
             $table->add('title', rcube::Q($this->rc->gettext('filesize')));
             $table->add('header', rcube::Q($this->rc->show_bytes($this->attachment['size'])));
         }
 
         $this->rc->output->set_env('attachment_download_url', $dl_url);
 
         return $table->show($attrib);
     }
 
 
     /*********  iTip message detection  *********/
 
     /**
      * Check mail message structure of there are .ics files attached
      */
     public function mail_message_load($p)
     {
         $this->ical_message = $p['object'];
         $itip_part     = null;
 
         // check all message parts for .ics files
         foreach ((array)$this->ical_message->mime_parts as $part) {
             if (self::part_is_vcalendar($part)) {
                 if ($part->ctype_parameters['method'])
                     $itip_part = $part->mime_id;
                 else
                     $this->ical_parts[] = $part->mime_id;
             }
         }
 
         // priorize part with method parameter
         if ($itip_part) {
             $this->ical_parts = array($itip_part);
         }
     }
 
     /**
      * Getter for the parsed iCal objects attached to the current email message
      *
      * @return object libvcalendar parser instance with the parsed objects
      */
     public function get_mail_ical_objects()
     {
         // create parser and load ical objects
         if (!$this->mail_ical_parser) {
             $this->mail_ical_parser = $this->get_ical();
 
             foreach ($this->ical_parts as $mime_id) {
                 $part    = $this->ical_message->mime_parts[$mime_id];
                 $charset = $part->ctype_parameters['charset'] ?: RCUBE_CHARSET;
                 $this->mail_ical_parser->import($this->ical_message->get_part_body($mime_id, true), $charset);
 
                 // check if the parsed object is an instance of a recurring event/task
                 array_walk($this->mail_ical_parser->objects, 'libcalendaring::identify_recurrence_instance');
 
                 // stop on the part that has an iTip method specified
                 if (count($this->mail_ical_parser->objects) && $this->mail_ical_parser->method) {
                     $this->mail_ical_parser->message_date = $this->ical_message->headers->date;
                     $this->mail_ical_parser->mime_id = $mime_id;
 
                     // store the message's sender address for comparisons
                     $from = rcube_mime::decode_address_list($this->ical_message->headers->from, 1, true, null, true);
                     $this->mail_ical_parser->sender = !empty($from) ? $from[1] : '';
 
                     if (!empty($this->mail_ical_parser->sender)) {
                         foreach ($this->mail_ical_parser->objects as $i => $object) {
                             $this->mail_ical_parser->objects[$i]['_sender'] = $this->mail_ical_parser->sender;
                             $this->mail_ical_parser->objects[$i]['_sender_utf'] = rcube_utils::idn_to_utf8($this->mail_ical_parser->sender);
                         }
                     }
 
                     break;
                 }
             }
         }
 
         return $this->mail_ical_parser;
     }
 
     /**
      * Read the given mime message from IMAP and parse ical data
      *
      * @param string Mailbox name
      * @param string Message UID
      * @param string Message part ID and object index (e.g. '1.2:0')
      * @param string Object type filter (optional)
      *
      * @return array Hash array with the parsed iCal 
      */
     public function mail_get_itip_object($mbox, $uid, $mime_id, $type = null)
     {
         $charset = RCUBE_CHARSET;
 
         // establish imap connection
         $imap = $this->rc->get_storage();
         $imap->set_folder($mbox);
 
         if ($uid && $mime_id) {
             list($mime_id, $index) = explode(':', $mime_id);
 
             $part    = $imap->get_message_part($uid, $mime_id);
             $headers = $imap->get_message_headers($uid);
             $parser  = $this->get_ical();
 
             if ($part->ctype_parameters['charset']) {
                 $charset = $part->ctype_parameters['charset'];
             }
 
             if ($part) {
                 $objects = $parser->import($part, $charset);
             }
         }
 
         // successfully parsed events/tasks?
         if (!empty($objects) && ($object = $objects[$index]) && (!$type || $object['_type'] == $type)) {
             if ($parser->method)
                 $object['_method'] = $parser->method;
 
             // store the message's sender address for comparisons
             $from = rcube_mime::decode_address_list($headers->from, 1, true, null, true);
             $object['_sender'] = !empty($from) ? $from[1] : '';
             $object['_sender_utf'] = rcube_utils::idn_to_utf8($object['_sender']);
 
             // check if this is an instance of a recurring event/task
             self::identify_recurrence_instance($object);
 
             return $object;
         }
 
         return null;
     }
 
     /**
      * Checks if specified message part is a vcalendar data
      *
      * @param rcube_message_part Part object
      * @return boolean True if part is of type vcard
      */
     public static function part_is_vcalendar($part)
     {
         return (
             in_array($part->mimetype, array('text/calendar', 'text/x-vcalendar', 'application/ics')) ||
             // Apple sends files as application/x-any (!?)
             ($part->mimetype == 'application/x-any' && $part->filename && preg_match('/\.ics$/i', $part->filename))
         );
     }
 
     /**
      * Single occourrences of recurring events are identified by their RECURRENCE-ID property
      * in iCal which is represented as 'recurrence_date' in our internal data structure.
      *
      * Check if such a property exists and derive the '_instance' identifier and '_savemode'
      * attributes which are used in the storage backend to identify the nested exception item.
      */
     public static function identify_recurrence_instance(&$object)
     {
         // for savemode=all, remove recurrence instance identifiers
         if (!empty($object['_savemode']) && $object['_savemode'] == 'all' && $object['recurrence']) {
             unset($object['_instance'], $object['recurrence_date']);
         }
         // set instance and 'savemode' according to recurrence-id
         else if (!empty($object['recurrence_date']) && is_a($object['recurrence_date'], 'DateTime')) {
             $object['_instance'] = self::recurrence_instance_identifier($object);
             $object['_savemode'] = $object['thisandfuture'] ? 'future' : 'current';
         }
         else if (!empty($object['recurrence_id']) && !empty($object['_instance'])) {
             if (strlen($object['_instance']) > 4) {
                 $object['recurrence_date'] = rcube_utils::anytodatetime($object['_instance'], $object['start']->getTimezone());
             }
             else {
                 $object['recurrence_date'] = clone $object['start'];
             }
         }
     }
 
     /**
      * Return a date() format string to render identifiers for recurrence instances
      *
      * @param array Hash array with event properties
      * @return string Format string
      */
     public static function recurrence_id_format($event)
     {
         return $event['allday'] ? 'Ymd' : 'Ymd\THis';
     }
 
     /**
      * Return the identifer for the given instance of a recurring event
      *
      * @param array Hash array with event properties
      * @param bool  All-day flag from the main event
      *
      * @return mixed Format string or null if identifier cannot be generated
      */
     public static function recurrence_instance_identifier($event, $allday = null)
     {
         $instance_date = $event['recurrence_date'] ?: $event['start'];
 
         if ($instance_date && is_a($instance_date, 'DateTime')) {
             // According to RFC5545 (3.8.4.4) RECURRENCE-ID format should
             // be date/date-time depending on the main event type, not the exception
             if ($allday === null) {
                 $allday = $event['allday'];
             }
 
             return $instance_date->format($allday ? 'Ymd' : 'Ymd\THis');
         }
     }
 
 
     /*********  Attendee handling functions  *********/
 
     /**
      * Handler for attendee group expansion requests
      */
     public function expand_attendee_group()
     {
         $id     = rcube_utils::get_input_value('id', rcube_utils::INPUT_POST);
         $data   = rcube_utils::get_input_value('data', rcube_utils::INPUT_POST, true);
         $result = array('id' => $id, 'members' => array());
         $maxnum = 500;
 
         // iterate over all autocomplete address books (we don't know the source of the group)
         foreach ((array)$this->rc->config->get('autocomplete_addressbooks', 'sql') as $abook_id) {
             if (($abook = $this->rc->get_address_book($abook_id)) && $abook->groups) {
                 foreach ($abook->list_groups($data['name'], 1) as $group) {
                     // this is the matching group to expand
                     if (in_array($data['email'], (array)$group['email'])) {
                         $abook->set_pagesize($maxnum);
                         $abook->set_group($group['ID']);
 
                         // get all members
                         $res = $abook->list_records($this->rc->config->get('contactlist_fields'));
 
                         // handle errors (e.g. sizelimit, timelimit)
                         if ($abook->get_error()) {
                             $result['error'] = $this->rc->gettext('expandattendeegrouperror', 'libcalendaring');
                             $res = false;
                         }
                         // check for maximum number of members (we don't wanna bloat the UI too much)
                         else if ($res->count > $maxnum) {
                             $result['error'] = $this->rc->gettext('expandattendeegroupsizelimit', 'libcalendaring');
                             $res = false;
                         }
 
                         while ($res && ($member = $res->iterate())) {
                             $emails = (array)$abook->get_col_values('email', $member, true);
                             if (!empty($emails) && ($email = array_shift($emails))) {
                                 $result['members'][] = array(
                                     'email' => $email,
                                     'name' => rcube_addressbook::compose_list_name($member),
                                 );
                             }
                         }
 
                         break 2;
                     }
                 }
             }
         }
 
         $this->rc->output->command('plugin.expand_attendee_callback', $result);
     }
 
     /**
      * Merge attendees of the old and new event version
      * with keeping current user and his delegatees status
      *
      * @param array &$new   New object data
      * @param array $old    Old object data
      * @param bool  $status New status of the current user
      */
     public function merge_attendees(&$new, $old, $status = null)
     {
         if (empty($status)) {
             $emails    = $this->get_user_emails();
             $delegates = array();
             $attendees = array();
 
             // keep attendee status of the current user
             foreach ((array) $new['attendees'] as $i => $attendee) {
                 if (empty($attendee['email'])) {
                     continue;
                 }
 
                 $attendees[] = $email = strtolower($attendee['email']);
 
                 if (in_array($email, $emails)) {
                     foreach ($old['attendees'] as $_attendee) {
                         if ($attendee['email'] == $_attendee['email']) {
                             $new['attendees'][$i] = $_attendee;
                             if ($_attendee['status'] == 'DELEGATED' && ($email = $_attendee['delegated-to'])) {
                                 $delegates[] = strtolower($email);
                             }
 
                             break;
                         }
                     }
                 }
             }
 
             // make sure delegated attendee is not lost
             foreach ($delegates as $delegatee) {
                 if (!in_array($delegatee, $attendees)) {
                     foreach ((array) $old['attendees'] as $attendee) {
                         if ($attendee['email'] && ($email = strtolower($attendee['email'])) && $email == $delegatee) {
                             $new['attendees'][] = $attendee;
                             break;
                         }
                     }
                 }
             }
         }
 
         // We also make sure that status of any attendee
         // is not overriden by NEEDS-ACTION if it was already set
         // which could happen if you work with shared events
         foreach ((array) $new['attendees'] as $i => $attendee) {
             if ($attendee['email'] && $attendee['status'] == 'NEEDS-ACTION') {
                 foreach ($old['attendees'] as $_attendee) {
                     if ($attendee['email'] == $_attendee['email']) {
                         $new['attendees'][$i]['status'] = $_attendee['status'];
                         unset($new['attendees'][$i]['rsvp']);
                         break;
                     }
                 }
             }
         }
     }
 
 
     /*********  Static utility functions  *********/
 
     /**
      * Convert the internal structured data into a vcalendar rrule 2.0 string
      */
     public static function to_rrule($recurrence, $allday = false)
     {
         if (is_string($recurrence))
             return $recurrence;
 
         $rrule = '';
         foreach ((array)$recurrence as $k => $val) {
             $k = strtoupper($k);
             switch ($k) {
             case 'UNTIL':
                 // convert to UTC according to RFC 5545
                 if (is_a($val, 'DateTime')) {
                     if (!$allday && !$val->_dateonly) {
                         $until = clone $val;
                         $until->setTimezone(new DateTimeZone('UTC'));
                         $val = $until->format('Ymd\THis\Z');
                     }
                     else {
                         $val = $val->format('Ymd');
                     }
                 }
                 break;
             case 'RDATE':
             case 'EXDATE':
                 foreach ((array)$val as $i => $ex) {
                     if (is_a($ex, 'DateTime'))
                         $val[$i] = $ex->format('Ymd\THis');
                 }
                 $val = join(',', (array)$val);
                 break;
             case 'EXCEPTIONS':
                 continue 2;
             }
 
             if (strlen($val))
                 $rrule .= $k . '=' . $val . ';';
         }
 
         return rtrim($rrule, ';');
     }
 
     /**
      * Convert from fullcalendar date format to PHP date() format string
      */
     public static function to_php_date_format($from)
     {
         // "dd.MM.yyyy HH:mm:ss" => "d.m.Y H:i:s"
         return strtr(strtr($from, array(
             'YYYY' => 'Y',
             'YY'   => 'y',
             'yyyy' => 'Y',
             'yy'   => 'y',
             'MMMM' => 'F',
             'MMM'  => 'M',
             'MM'   => 'm',
             'M'    => 'n',
             'dddd' => 'l',
             'ddd'  => 'D',
             'dd'   => 'd',
             'd'    => 'j',
             'HH'   => '**',
             'hh'   => '%%',
             'H'    => 'G',
             'h'    => 'g',
             'mm'   => 'i',
             'ss'   => 's',
             'TT'   => 'A',
             'tt'   => 'a',
             'T'    => 'A',
             't'    => 'a',
             'u'    => 'c',
         )), array(
             '**'   => 'H',
             '%%'   => 'h',
         ));
     }
 
     /**
      * Convert from PHP date() format to fullcalendar format string
      */
     public static function from_php_date_format($from)
     {
         // "d.m.Y H:i:s" => "dd.MM.yyyy HH:mm:ss"
         return strtr($from, array(
             'y' => 'yy',
             'Y' => 'yyyy',
             'M' => 'MMM',
             'F' => 'MMMM',
             'm' => 'MM',
             'n' => 'M',
             'j' => 'd',
             'd' => 'dd',
             'D' => 'ddd',
             'l' => 'dddd',
             'H' => 'HH',
             'h' => 'hh',
             'G' => 'H',
             'g' => 'h',
             'i' => 'mm',
             's' => 'ss',
             'A' => 'TT',
             'a' => 'tt',
             'c' => 'u',
         ));
     }
 
 }
diff --git a/plugins/libcalendaring/localization/de_CH.inc b/plugins/libcalendaring/localization/de_CH.inc
index 4a9b0d8e..c36efbde 100644
--- a/plugins/libcalendaring/localization/de_CH.inc
+++ b/plugins/libcalendaring/localization/de_CH.inc
@@ -1,159 +1,161 @@
 <?php
 /**
  * Localizations for the Kolab calendaring utilities plugin
  *
  * Copyright (C) 2014, Kolab Systems AG
  *
  * For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
  */
 $labels['until'] = 'bis';
 $labels['at'] = 'um';
 $labels['alarmemail'] = 'E-Mail senden';
 $labels['alarmdisplay'] = 'Nachricht anzeigen';
 $labels['alarmaudio'] = 'Audio abspielen';
 $labels['alarmdisplayoption'] = 'Nachricht';
 $labels['alarmemailoption'] = 'E-Mail';
 $labels['alarmaudiooption'] = 'Audio';
 $labels['alarmat'] = 'um $datetime';
 $labels['trigger@'] = 'genau am';
 $labels['trigger-M'] = 'Minuten davor';
 $labels['trigger-H'] = 'Stunden davor';
 $labels['trigger-D'] = 'Tage davor';
 $labels['trigger+M'] = 'Minuten danach';
 $labels['trigger+H'] = 'Stunden danach';
 $labels['trigger+D'] = 'Tage danach';
 $labels['triggerend-M'] = 'Minuten vor dem Ende';
 $labels['triggerend-H'] = 'Stunden vor dem Ende';
 $labels['triggerend-D'] = 'Tage vor dem Ende';
 $labels['triggerend+M'] = 'Minuten nach dem Ende';
 $labels['triggerend+H'] = 'Stunden nach dem Ende';
 $labels['triggerend+D'] = 'Tage nach dem Ende';
 $labels['trigger0'] = 'um exakt';
 $labels['triggerattime'] = 'zur Startzeit';
 $labels['triggerattimeend'] = 'zur Endzeit';
 $labels['relatedstart'] = 'Beginn';
 $labels['relatedendevent'] = 'Ende';
 $labels['relatedendtask'] = 'Frist';
 $labels['addalarm'] = 'Erinnerung hinzufügen';
 $labels['removealarm'] = 'Erinnerung entfernen';
 $labels['alarmtitle'] = 'Anstehende Termine';
 $labels['dismissall'] = 'Alle ignorieren';
 $labels['dismiss'] = 'Ignorieren';
 $labels['snooze'] = 'Später erinnern';
 $labels['repeatinmin'] = 'Wiederholung in $min Minuten';
 $labels['repeatinhr'] = 'Wiederholung in 1 Stunde';
 $labels['repeatinhrs'] = 'Wiederholung in $hrs Stunden';
 $labels['repeattomorrow'] = 'Wiederholung morgen';
 $labels['repeatinweek'] = 'Wiederholung in einer Woche';
 $labels['showmore'] = 'Mehr anzeigen...';
 $labels['recurring'] = 'Wiederholungen';
 $labels['frequency'] = 'Wiederholung';
 $labels['never'] = 'nie';
 $labels['daily'] = 'täglich';
 $labels['weekly'] = 'wöchentlich';
 $labels['monthly'] = 'monatlich';
 $labels['yearly'] = 'jährlich';
 $labels['rdate'] = 'genau um';
 $labels['every'] = 'Alle';
 $labels['days'] = 'Tag(e)';
 $labels['weeks'] = 'Woche(n)';
 $labels['months'] = 'Monat(e)';
 $labels['years'] = 'Jahre(e) im:';
 $labels['bydays'] = 'Am';
 $labels['untildate'] = 'am';
 $labels['each'] = 'Jeden';
 $labels['onevery'] = 'An jedem';
 $labels['onsamedate'] = 'Am gleichen Tag';
 $labels['forever'] = 'unendlich';
 $labels['recurrencend'] = 'bis';
 $labels['untilenddate'] = 'bis am';
 $labels['forntimes'] = '$nr Wiederholungen';
 $labels['first'] = 'erster';
 $labels['second'] = 'zweiter';
 $labels['third'] = 'dritter';
 $labels['fourth'] = 'vierter';
 $labels['last'] = 'letzter';
 $labels['dayofmonth'] = 'Tag des Montats';
 $labels['addrdate'] = 'Datum hinzufügen';
 $labels['except'] = 'ausser';
 $labels['statusorganizer'] = 'Organisator';
 $labels['statusaccepted'] = 'Akzeptiert';
 $labels['statustentative'] = 'Mit Vorbehalt';
 $labels['statusdeclined'] = 'Abgelehnt';
 $labels['statusdelegated'] = 'Delegiert';
 $labels['statusneeds-action'] = 'Braucht Aktion';
 $labels['statusunknown'] = 'Unbekannt';
 $labels['statuscompleted'] = 'Abgeschlossen';
 $labels['statusin-process'] = 'In Bearbeitung';
+$labels['delegatedto'] = 'Delegiert an:';
+$labels['delegatedfrom'] = 'Delegiert von:';
 $labels['itipinvitation'] = 'Einladung zu';
 $labels['itipupdate'] = 'Aktialisiert:';
 $labels['itipcancellation'] = 'Abgesagt:';
 $labels['itipreply'] = 'Antwort zu';
 $labels['itipaccepted'] = 'Akzeptieren';
 $labels['itiptentative'] = 'Mit Vorbehalt';
 $labels['itipdeclined'] = 'Ablehnen';
 $labels['itipdelegated'] = 'Vertreter';
 $labels['itipneeds-action'] = 'Aufschieben';
 $labels['itipcomment'] = 'Ihre Antwort';
 $labels['itipeditresponse'] = 'Antwort eingeben';
 $labels['itipsendercomment'] = 'Kommentar des Absenders:';
 $labels['itipsuppressreply'] = 'Keine Antwort senden';
 $labels['itipobjectnotfound'] = 'Das Objekt auf welches sich diese Nachricht bezieht, wurde in Ihrem Konto nicht gefunden.';
 $labels['itipsubjectaccepted'] = 'Einladung zu "$title" wurde von $name angenommen';
 $labels['itipsubjecttentative'] = 'Einladung zu "$title" wurde von $name mit Vorbehalt angenommen';
 $labels['itipsubjectdeclined'] = 'Einladung zu "$title" wurde von $name abgelehnt';
 $labels['itipsubjectin-process'] = '"$title" ist nun in Bearbeitung von $name';
 $labels['itipsubjectcompleted'] = '"$title" wurde vom $name fertiggestellt';
 $labels['itipsubjectcancel'] = 'Ihre Teilnahme in "$title" wurde aufgehoben';
 $labels['itipsubjectdelegated'] = '"$title" wurde durch $name delegiert';
 $labels['itipsubjectdelegatedto'] = '"$title" wurde durch $name an Sie delegiert';
 $labels['itipnewattendee'] = 'Dies ist eine Antwort von einem neuen Teilnehmer';
 $labels['updateattendeestatus'] = 'Teilnehmerstatus aktualisieren';
 $labels['acceptinvitation'] = 'Möchten Sie die Einladung zu diesem Termin annehmen?';
 $labels['acceptattendee'] = 'Teilnehmer akzeptieren';
 $labels['declineattendee'] = 'Teilnehmer ablehnen';
 $labels['declineattendeeconfirm'] = 'Nachricht an den abgelehnten Teilnehmer verfassen (optional):';
 $labels['rsvpmodeall'] = 'Die gesamte Reihe';
 $labels['rsvpmodecurrent'] = 'Nur dieses Ereignis';
 $labels['rsvpmodefuture'] = 'Dieses und zukünftige Ereignisse';
 $labels['itipsingleoccurrence'] = 'Dieses ist eine <em>einzelne Wiederholung</emaußerhalb einer Serie von Ereignissen';
 $labels['itipfutureoccurrence'] = 'Bezieht sich auf <em>diese and alle zukünftigen Wiederholungen</emeiner Serie von Ereignissen';
 $labels['itipmessagesingleoccurrence'] = 'Diese Nachricht bezieht sich nur auf eine einzelne Wiederholung';
 $labels['itipmessagefutureoccurrence'] = 'Diese Nachricht bezieht sich auf diese und alle zukünftigen Wiederholungen';
 $labels['youhaveaccepted'] = 'Sie haben die Einladung angenommen';
 $labels['youhavetentative'] = 'Sie haben die Einladung mit Vorbehalt angenommen';
 $labels['youhavedeclined'] = 'Sie haben die Einladung abgelehnt';
 $labels['youhavedelegated'] = 'Sie haben diese Einladung abgelehnt';
 $labels['youhavein-process'] = 'Sie arbeiten an dieser Aufgabe';
 $labels['youhavecompleted'] = 'Sie haben diese Aufgabe erledigt';
 $labels['youhaveneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
 $labels['youhavepreviouslyaccepted'] = 'Sie haben diese Einladung zuvor angenommen';
 $labels['youhavepreviouslytentative'] = 'Sie haben diese Einladung zuvor mit Vorbehalt angenommen';
 $labels['youhavepreviouslydeclined'] = 'Sie haben diese Einladung zuvor abgelehnt';
 $labels['youhavepreviouslydelegated'] = 'Sie haben diese Einladung zuvor delegiert';
 $labels['youhavepreviouslyin-process'] = 'Sie haben diese Aufgabe zuvor als In Bearbeitung gemeldet';
 $labels['youhavepreviouslycompleted'] = 'Sie haben diese Einladung zuvor erledigt';
 $labels['youhavepreviouslyneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
 $labels['attendeeaccepted'] = 'Teilnehmer hat akzeptiert';
 $labels['attendeetentative'] = 'Teilnehmer hat mit Vorbehalt akzeptiert';
 $labels['attendeedeclined'] = 'Teilnehmer hat abgelehnt';
 $labels['attendeedelegated'] = 'Teilnehmer hat an $delegatedto delegiert';
 $labels['attendeein-process'] = 'Teilnehmer arbeitet an dieser Aufgabe';
 $labels['attendeecompleted'] = 'Teilnehmer hat die Aufgabe erledigt';
 $labels['notanattendee'] = 'Sie sind nicht in der Liste der Teilnehmer aufgeführt';
 $labels['outdatedinvitation'] = 'Diese Einladung wurde durch eine neuere Version ersetzt';
 $labels['importtocalendar'] = 'In Kalender übernehmen';
 $labels['removefromcalendar'] = 'Aus meinem Kalender löschen';
 $labels['updatemycopy'] = 'Meine Kopie aktualisieren';
 $labels['openpreview'] = 'Vorschau öffnen';
 $labels['deleteobjectconfirm'] = 'Möchten Sie dieses Objekt wirklich löschen?';
 $labels['declinedeleteconfirm'] = 'Soll das abgelehnte Objekt ebenfalls aus Ihrem Konto gelöscht werden?';
 $labels['delegateinvitation'] = 'Einladung delegieren';
 $labels['delegateto'] = 'Delegieren an';
 $labels['delegatersvpme'] = 'Informiere mich über Aktualisierungen dieses Termins';
 $labels['delegateinvalidaddress'] = 'Geben Sie eine gültige E-Mail-Adresse für den Delegierten ein';
 $labels['savingdata'] = 'Speichere...';
 $labels['expandattendeegroup'] = 'Mit Gruppenmitgliedern ersetzen';
 $labels['expandattendeegroupnodata'] = 'Diese Gruppe konnte nicht ersetzt werden. Keine Gruppenmitglieder gefunden.';
 $labels['expandattendeegrouperror'] = 'Diese Gruppe konnte nicht ersetzt werden. Sie hat möglicherweise zuviele Mitglieder.';
 $labels['expandattendeegroupsizelimit'] = 'Die Gruppe hat zuviele Mitglieder und konnte deshalb nicht ersetzt werden.';
diff --git a/plugins/libcalendaring/localization/de_DE.inc b/plugins/libcalendaring/localization/de_DE.inc
index 7e8d7286..509eb35e 100644
--- a/plugins/libcalendaring/localization/de_DE.inc
+++ b/plugins/libcalendaring/localization/de_DE.inc
@@ -1,186 +1,188 @@
 <?php
 
 /**
  * Localizations for the Kolab calendaring utilities plugin
  *
  * Copyright (C) 2014, Kolab Systems AG
  *
  * For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
  */
 
 $labels = array();
 
 // words for spoken dates
 $labels['until'] = 'bis';
 $labels['at'] = 'um';
 
 // alarms related labels
 $labels['alarmemail'] = 'E-Mail senden';
 $labels['alarmdisplay'] = 'Nachricht anzeigen';
 $labels['alarmaudio'] = 'Audio abspielen';
 $labels['alarmdisplayoption'] = 'Nachricht';
 $labels['alarmemailoption'] = 'E-Mail';
 $labels['alarmaudiooption'] = 'Audio';
 $labels['alarmat'] = 'um $datetime';
 $labels['trigger@'] = 'genau am';
 $labels['trigger-M'] = 'Minuten davor';
 $labels['trigger-H'] = 'Stunden davor';
 $labels['trigger-D'] = 'Tage davor';
 $labels['trigger+M'] = 'Minuten danach';
 $labels['trigger+H'] = 'Stunden danach';
 $labels['trigger+D'] = 'Tage danach';
 $labels['triggerend-M'] = 'Minuten vor dem Ende';
 $labels['triggerend-H'] = 'Stunden vor dem Ende';
 $labels['triggerend-D'] = 'Tage vor dem Ende';
 $labels['triggerend+M'] = 'Minuten nach dem Ende';
 $labels['triggerend+H'] = 'Stunden nach dem Ende';
 $labels['triggerend+D'] = 'Tage nach dem Ende';
 $labels['trigger0'] = 'um exakt';
 $labels['triggerattime'] = 'zur Startzeit';
 $labels['triggerattimeend'] = 'zur Endzeit';
 $labels['relatedstart'] = 'Beginn';
 $labels['relatedendevent'] = 'Ende';
 $labels['relatedendtask'] = 'Frist';
 $labels['addalarm'] = 'Erinnerung hinzufügen';
 $labels['removealarm'] = 'Erinnerung entfernen';
 
 $labels['alarmtitle'] = 'Anstehende Termine';
 $labels['dismissall'] = 'Alle ignorieren';
 $labels['dismiss'] = 'Ignorieren';
 $labels['snooze'] = 'Später erinnern';
 $labels['repeatinmin'] = 'Wiederholung in $min Minuten';
 $labels['repeatinhr'] = 'Wiederholung in 1 Stunde';
 $labels['repeatinhrs'] = 'Wiederholung in $hrs Stunden';
 $labels['repeattomorrow'] = 'Wiederholung morgen';
 $labels['repeatinweek'] = 'Wiederholung in einer Woche';
 
 $labels['showmore'] = 'Mehr anzeigen...';
 
 // recurrence related labels
 $labels['recurring'] = 'Wiederholungen';
 $labels['frequency'] = 'Wiederholung';
 $labels['never'] = 'nie';
 $labels['daily'] = 'täglich';
 $labels['weekly'] = 'wöchentlich';
 $labels['monthly'] = 'monatlich';
 $labels['yearly'] = 'jährlich';
 $labels['rdate'] = 'genau am';
 $labels['every'] = 'Alle';
 $labels['days'] = 'Tag(e)';
 $labels['weeks'] = 'Woche(n)';
 $labels['months'] = 'Monat(e)';
 $labels['years'] = 'Jahre(e) im:';
 $labels['bydays'] = 'Am';
 $labels['untildate'] = 'am';
 $labels['each'] = 'Jeden';
 $labels['onevery'] = 'An jedem';
 $labels['onsamedate'] = 'Am gleichen Tag';
 $labels['forever'] = 'unendlich';
 $labels['recurrencend'] = 'bis';
 $labels['untilenddate'] = 'bis am';
 $labels['forntimes'] = '$nr Wiederholungen';
 $labels['first'] = 'erster';
 $labels['second'] = 'zweiter';
 $labels['third'] = 'dritter';
 $labels['fourth'] = 'vierter';
 $labels['last'] = 'letzter';
 $labels['dayofmonth'] = 'Tag des Montats';
 $labels['addrdate'] = 'Datum hinzufügen';
 $labels['except'] = 'ausser';
 
 $labels['statusorganizer'] = 'Organisator';
 $labels['statusaccepted'] = 'Akzeptiert';
 $labels['statustentative'] = 'Mit Vorbehalt';
 $labels['statusdeclined'] = 'Abgelehnt';
 $labels['statusdelegated'] = 'Delegiert';
 $labels['statusneeds-action'] = 'Braucht Aktion';
 $labels['statusunknown'] = 'Unbekannt';
 $labels['statuscompleted'] = 'Abgeschlossen';
+$labels['delegatedto'] = 'Delegiert an:';
+$labels['delegatedfrom'] = 'Delegiert von:';
 $labels['statusin-process'] = 'In Bearbeitung';
 
 // itip related labels
 $labels['itipinvitation'] = 'Einladung zu';
 $labels['itipupdate'] = 'Aktialisiert:';
 $labels['itipcancellation'] = 'Abgesagt:';
 $labels['itipreply'] = 'Antwort zu';
 $labels['itipaccepted'] = 'Akzeptieren';
 $labels['itiptentative'] = 'Mit Vorbehalt';
 $labels['itipdeclined'] = 'Ablehnen';
 $labels['itipdelegated'] = 'Delegieren';
 $labels['itipneeds-action'] = 'Aufschieben';
 $labels['itipcomment'] = 'Ihre Antwort';
 $labels['itipeditresponse'] = 'Antwort eingeben';
 $labels['itipsendercomment'] = 'Kommentar des Absenders:';
 $labels['itipsuppressreply'] = 'Keine Antwort senden';
 
 $labels['itipobjectnotfound'] = 'Das Objekt auf welches sich diese Nachricht bezieht, wurde in Ihrem Konto nicht gefunden.';
 $labels['itipsubjectaccepted'] = 'Einladung zu "$title" wurde von $name angenommen';
 $labels['itipsubjecttentative'] = 'Einladung zu "$title" wurde von $name mit Vorbehalt angenommen';
 $labels['itipsubjectdeclined'] = 'Einladung zu "$title" wurde von $name abgelehnt';
 $labels['itipsubjectin-process'] = '"$title" ist nun in Bearbeitung von $name';
 $labels['itipsubjectcompleted'] = '"$title" wurde vom $name fertiggestellt';
 $labels['itipsubjectcancel'] = 'Ihre Teilnahme in "$title" wurde aufgehoben';
 $labels['itipsubjectdelegated'] = '"$title" wurde durch $name delegiert';
 $labels['itipsubjectdelegatedto'] = '"$title" wurde durch $name an Sie delegiert';
 
 $labels['itipnewattendee'] = 'Dies ist eine Antwort von einem neuen Teilnehmer';
 $labels['updateattendeestatus'] = 'Teilnehmerstatus aktualisieren';
 $labels['acceptinvitation'] = 'Möchten Sie die Einladung zu diesem Termin annehmen?';
 $labels['acceptattendee'] = 'Teilnehmer akzeptieren';
 $labels['declineattendee'] = 'Teilnehmer ablehnen';
 $labels['declineattendeeconfirm'] = 'Nachricht an den abgelehnten Teilnehmer verfassen (optional):';
 $labels['rsvpmodeall'] = 'Die gesamte Reihe';
 $labels['rsvpmodecurrent'] = 'Nur dieses Ereignis';
 $labels['rsvpmodefuture'] = 'Dieses und zukünftige Ereignisse';
 
 $labels['itipsingleoccurrence'] = 'Dieses ist eine <em>einzelne Wiederholung</em> einer Serie von Ereignissen';
 $labels['itipfutureoccurrence'] = 'Bezieht sich auf <em>diese and alle zukünftigen Wiederholungen</em> einer Serie von Ereignissen';
 $labels['itipmessagesingleoccurrence'] = 'Diese Nachricht bezieht sich nur auf eine einzelne Wiederholung';
 $labels['itipmessagefutureoccurrence'] = 'Diese Nachricht bezieht sich auf diese und alle zukünftigen Wiederholungen';
 
 $labels['youhaveaccepted'] = 'Sie haben die Einladung angenommen';
 $labels['youhavetentative'] = 'Sie haben die Einladung mit Vorbehalt angenommen';
 $labels['youhavedeclined'] = 'Sie haben die Einladung abgelehnt';
 $labels['youhavedelegated'] = 'Sie haben diese Einladung abgelehnt';
 $labels['youhavein-process'] = 'Sie arbeiten an dieser Aufgabe';
 $labels['youhavecompleted'] = 'Sie haben diese Aufgabe erledigt';
 $labels['youhaveneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
 
 $labels['youhavepreviouslyaccepted'] = 'Sie haben diese Einladung zuvor angenommen';
 $labels['youhavepreviouslytentative'] = 'Sie haben diese Einladung zuvor mit Vorbehalt angenommen';
 $labels['youhavepreviouslydeclined'] = 'Sie haben diese Einladung zuvor abgelehnt';
 $labels['youhavepreviouslydelegated'] = 'Sie haben diese Einladung zuvor delegiert';
 $labels['youhavepreviouslyin-process'] = 'Sie haben diese Aufgabe zuvor als In Bearbeitung gemeldet';
 $labels['youhavepreviouslycompleted'] = 'Sie haben diese Einladung zuvor erledigt';
 $labels['youhavepreviouslyneeds-action'] = 'Ihre Antwort auf diese Einladung ist noch ausstehend';
 
 $labels['attendeeaccepted'] = 'Teilnehmer hat akzeptiert';
 $labels['attendeetentative'] = 'Teilnehmer hat mit Vorbehalt akzeptiert';
 $labels['attendeedeclined'] = 'Teilnehmer hat abgelehnt';
 $labels['attendeedelegated'] = 'Teilnehmer hat an $delegatedto delegiert';
 $labels['attendeein-process'] = 'Teilnehmer arbeitet an dieser Aufgabe';
 $labels['attendeecompleted'] = 'Teilnehmer hat die Aufgabe erledigt';
 $labels['notanattendee'] = 'Sie sind nicht in der Liste der Teilnehmer aufgeführt';
 $labels['outdatedinvitation'] = 'Diese Einladung wurde durch eine neuere Version ersetzt';
 
 $labels['importtocalendar'] = 'In Kalender übernehmen';
 $labels['removefromcalendar'] = 'Aus meinem Kalender löschen';
 $labels['updatemycopy'] = 'Meine Kopie aktualisieren';
 $labels['openpreview'] = 'Vorschau öffnen';
 
 $labels['deleteobjectconfirm'] = 'Möchten Sie dieses Objekt wirklich löschen?';
 $labels['declinedeleteconfirm'] = 'Soll das abgelehnte Objekt ebenfalls aus Ihrem Konto gelöscht werden?';
 
 $labels['delegateinvitation'] = 'Einladung delegieren';
 $labels['delegateto'] = 'Delegieren an';
 $labels['delegatersvpme'] = 'Informiere mich über Aktualisierungen dieses Termins';
 $labels['delegateinvalidaddress'] = 'Geben Sie eine gültige E-Mail-Adresse für den Delegierten ein';
 
 $labels['savingdata'] = 'Speichere...';
 
 // attendees labels
 $labels['expandattendeegroup'] = 'Mit Gruppenmitgliedern ersetzen';
 $labels['expandattendeegroupnodata'] = 'Diese Gruppe konnte nicht ersetzt werden. Keine Gruppenmitglieder gefunden.';
 $labels['expandattendeegrouperror'] = 'Diese Gruppe konnte nicht ersetzt werden. Sie hat möglicherweise zuviele Mitglieder.';
 $labels['expandattendeegroupsizelimit'] = 'Die Gruppe hat zuviele Mitglieder und konnte deshalb nicht ersetzt werden.';
 
diff --git a/plugins/libcalendaring/localization/en_US.inc b/plugins/libcalendaring/localization/en_US.inc
index bbdcc2bd..1d871207 100644
--- a/plugins/libcalendaring/localization/en_US.inc
+++ b/plugins/libcalendaring/localization/en_US.inc
@@ -1,186 +1,188 @@
 <?php
 
 /**
  * Localizations for the Kolab calendaring utilities plugin
  *
  * Copyright (C) 2014, Kolab Systems AG
  *
  * For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
  */
 
 $labels = array();
 
 // words for spoken dates
 $labels['until'] = 'until';
 $labels['at'] = 'at';
 
 // alarms related labels
 $labels['alarmemail'] = 'Send Email';
 $labels['alarmdisplay'] = 'Show message';
 $labels['alarmaudio'] = 'Play sound';
 $labels['alarmdisplayoption'] = 'Message';
 $labels['alarmemailoption'] = 'Email';
 $labels['alarmaudiooption'] = 'Sound';
 $labels['alarmat'] = 'at $datetime';
 $labels['trigger@'] = 'on date';
 $labels['trigger-M'] = 'minutes before';
 $labels['trigger-H'] = 'hours before';
 $labels['trigger-D'] = 'days before';
 $labels['trigger+M'] = 'minutes after';
 $labels['trigger+H'] = 'hours after';
 $labels['trigger+D'] = 'days after';
 $labels['triggerend-M'] = 'minutes before end';
 $labels['triggerend-H'] = 'hours before end';
 $labels['triggerend-D'] = 'days before end';
 $labels['triggerend+M'] = 'minutes after end';
 $labels['triggerend+H'] = 'hours after end';
 $labels['triggerend+D'] = 'days after end';
 $labels['trigger0'] = 'on time';
 $labels['triggerattime'] = 'at start time';
 $labels['triggerattimeend'] = 'at end time';
 $labels['relatedstart'] = 'start';
 $labels['relatedendevent'] = 'end';
 $labels['relatedendtask'] = 'due time';
 $labels['addalarm'] = 'Add alarm';
 $labels['removealarm'] = 'Remove alarm';
 
 $labels['alarmtitle'] = 'Upcoming events';
 $labels['dismissall'] = 'Dismiss all';
 $labels['dismiss'] = 'Dismiss';
 $labels['snooze'] = 'Snooze';
 $labels['repeatinmin'] = 'Repeat in $min minutes';
 $labels['repeatinhr'] = 'Repeat in 1 hour';
 $labels['repeatinhrs'] = 'Repeat in $hrs hours';
 $labels['repeattomorrow'] = 'Repeat tomorrow';
 $labels['repeatinweek'] = 'Repeat in a week';
 
 $labels['showmore'] = 'Show more...';
 
 // recurrence related labels
 $labels['recurring'] = 'Repeats';
 $labels['frequency'] = 'Repeat';
 $labels['never'] = 'never';
 $labels['daily'] = 'daily';
 $labels['weekly'] = 'weekly';
 $labels['monthly'] = 'monthly';
 $labels['yearly'] = 'annually';
 $labels['rdate'] = 'on dates';
 $labels['every'] = 'Every';
 $labels['days'] = 'day(s)';
 $labels['weeks'] = 'week(s)';
 $labels['months'] = 'month(s)';
 $labels['years'] = 'year(s)';
 $labels['bydays'] = 'On';
 $labels['untildate'] = 'the';
 $labels['each'] = 'Each';
 $labels['onevery'] = 'On every';
 $labels['onsamedate'] = 'On the same date';
 $labels['forever'] = 'forever';
 $labels['recurrencend'] = 'until';
 $labels['untilenddate'] = 'until date';
 $labels['forntimes'] = 'for $nr time(s)';
 $labels['first'] = 'first';
 $labels['second'] = 'second';
 $labels['third'] = 'third';
 $labels['fourth'] = 'fourth';
 $labels['last'] = 'last';
 $labels['dayofmonth'] = 'Day of month';
 $labels['addrdate'] = 'Add repeat date';
 $labels['except'] = 'except';
 
 $labels['statusorganizer'] = 'Organizer';
 $labels['statusaccepted'] = 'Accepted';
 $labels['statustentative'] = 'Tentative';
 $labels['statusdeclined'] = 'Declined';
 $labels['statusdelegated'] = 'Delegated';
 $labels['statusneeds-action'] = 'Needs action';
 $labels['statusunknown'] = 'Unknown';
 $labels['statuscompleted'] = 'Completed';
 $labels['statusin-process'] = 'In process';
+$labels['delegatedto'] = 'Delegated to: ';
+$labels['delegatedfrom'] = 'Delegated from: ';
 
 // itip related labels
 $labels['itipinvitation'] = 'Invitation to';
 $labels['itipupdate'] = 'Update of';
 $labels['itipcancellation'] = 'Cancelled:';
 $labels['itipreply'] = 'Reply to';
 $labels['itipaccepted'] = 'Accept';
 $labels['itiptentative'] = 'Maybe';
 $labels['itipdeclined'] = 'Decline';
 $labels['itipdelegated'] = 'Delegate';
 $labels['itipneeds-action'] = 'Postpone';
 $labels['itipcomment'] = 'Your response';
 $labels['itipeditresponse'] = 'Enter a response text';
 $labels['itipsendercomment'] = 'Sender\'s comment: ';
 $labels['itipsuppressreply'] = 'Do not send a response';
 
 $labels['itipobjectnotfound'] = 'The object referred by this message was not found in your account.';
 $labels['itipsubjectaccepted'] = '"$title" has been accepted by $name';
 $labels['itipsubjecttentative'] = '"$title" has been tentatively accepted by $name';
 $labels['itipsubjectdeclined'] = '"$title" has been declined by $name';
 $labels['itipsubjectin-process'] = '"$title" is in-process by $name';
 $labels['itipsubjectcompleted'] = '"$title" was completed by $name';
 $labels['itipsubjectcancel'] = 'Your participation in "$title" has been cancelled';
 $labels['itipsubjectdelegated'] = '"$title" has been delegated by $name';
 $labels['itipsubjectdelegatedto'] = '"$title" has been delegated to you by $name';
 
 $labels['itipnewattendee'] = 'This is a reply from a new participant';
 $labels['updateattendeestatus'] = 'Update the participant\'s status';
 $labels['acceptinvitation'] = 'Do you accept this invitation?';
 $labels['acceptattendee'] = 'Accept participant';
 $labels['declineattendee'] = 'Decline participant';
 $labels['declineattendeeconfirm'] = 'Enter a message to the declined participant (optional):';
 $labels['rsvpmodeall'] = 'The entire series';
 $labels['rsvpmodecurrent'] = 'This occurrence only';
 $labels['rsvpmodefuture'] = 'This and future occurrences';
 
 $labels['itipsingleoccurrence'] = 'This is a <em>single occurrence</em> out of a series of events';
 $labels['itipfutureoccurrence'] = 'Refers to <em>this and all future occurrences</em> of a series of events';
 $labels['itipmessagesingleoccurrence'] = 'The message only refers to this single occurrence';
 $labels['itipmessagefutureoccurrence'] = 'The message refers to this and all future occurrences';
 
 $labels['youhaveaccepted'] = 'You have accepted this invitation';
 $labels['youhavetentative'] = 'You have tentatively accepted this invitation';
 $labels['youhavedeclined'] = 'You have declined this invitation';
 $labels['youhavedelegated'] = 'You have delegated this invitation';
 $labels['youhavein-process'] = 'You are working on this assignment';
 $labels['youhavecompleted'] = 'You have completed this assignment';
 $labels['youhaveneeds-action'] = 'Your response to this invitation is still pending';
 
 $labels['youhavepreviouslyaccepted'] = 'You have previously accepted this invitation';
 $labels['youhavepreviouslytentative'] = 'You have previously accepted this invitation tentatively';
 $labels['youhavepreviouslydeclined'] = 'You have previously declined this invitation';
 $labels['youhavepreviouslydelegated'] = 'You have previously delegated this invitation';
 $labels['youhavepreviouslyin-process'] = 'You have previously reported to work on this assignment';
 $labels['youhavepreviouslycompleted'] = 'You have previously completed this assignment';
 $labels['youhavepreviouslyneeds-action'] = 'Your response to this invitation is still pending';
 
 $labels['attendeeaccepted'] = 'Participant has accepted';
 $labels['attendeetentative'] = 'Participant has tentatively accepted';
 $labels['attendeedeclined'] = 'Participant has declined';
 $labels['attendeedelegated'] = 'Participant has delegated to $delegatedto';
 $labels['attendeein-process'] = 'Participant is in-process';
 $labels['attendeecompleted'] = 'Participant has completed';
 $labels['notanattendee'] = 'You\'re not listed as an attendee of this object';
 $labels['outdatedinvitation'] = 'This invitation has been replaced by a newer version';
 
 $labels['importtocalendar'] = 'Save to my calendar';
 $labels['removefromcalendar'] = 'Remove from my calendar';
 $labels['updatemycopy'] = 'Update my copy';
 $labels['openpreview'] = 'Open Preview';
 
 $labels['deleteobjectconfirm'] = 'Do you really want to delete this object?';
 $labels['declinedeleteconfirm'] = 'Do you also want to delete this declined object from your account?';
 
 $labels['delegateinvitation'] = 'Delegate Invitation';
 $labels['delegateto'] = 'Delegate to';
 $labels['delegatersvpme'] = 'Keep me informed about updates of this incidence';
 $labels['delegateinvalidaddress'] = 'Please enter a valid email address for the delegate';
 
 $labels['savingdata'] = 'Saving data...';
 
 // attendees labels
 $labels['expandattendeegroup'] = 'Substitute with group members';
 $labels['expandattendeegroupnodata'] = 'Unable to substitute this group. No members found.';
 $labels['expandattendeegrouperror'] = 'Unable to substitute this group. It might contain too many members.';
 $labels['expandattendeegroupsizelimit'] = 'This group contains too many members for substituting.';
 
diff --git a/plugins/tasklist/localization/en_US.inc b/plugins/tasklist/localization/en_US.inc
index e42194c4..d34f17de 100644
--- a/plugins/tasklist/localization/en_US.inc
+++ b/plugins/tasklist/localization/en_US.inc
@@ -1,217 +1,215 @@
 <?php
 
 /**
  * Localizations for the Kolab Tasks plugin
  *
  * Copyright (C) 2014, Kolab Systems AG
  *
  * For translation see https://www.transifex.com/projects/p/kolab/resource/tasklist/
  */
 
 $labels = array();
 $labels['navtitle'] = 'Tasks';
 $labels['lists'] = 'Tasklists';
 $labels['list'] = 'Tasklist';
 $labels['tags'] = 'Tags';
 $labels['export'] = 'Export';
 $labels['exporttitle'] = 'Export to iCalendar';
 $labels['exportattachments'] = 'With attachments';
 $labels['currentview'] = 'current view';
 $labels['tasklistsubscribe'] = 'List permanently';
 $labels['listsearchresults'] = 'Available Tasklists';
 $labels['findlists'] = 'Find tasklists...';
 $labels['searchterms'] = 'Search terms';
 $labels['notasklistsfound'] = 'No tasklists found';
 $labels['nrtasklistsfound'] = '$nr tasklists found';
 $labels['removelist'] = 'Remove from list';
 $labels['showcaldavurl'] = 'Show CalDAV URL';
 $labels['caldavurldescription'] = 'Copy this address to a <a href="http://en.wikipedia.org/wiki/CalDAV" target="_blank">CalDAV</a> client application (e.g. Evolution or Mozilla Thunderbird) to synchronize this specific tasklist with your computer or mobile device.';
 
 $labels['newtask'] = 'New Task';
 $labels['createtask'] = 'Create Task <Enter>';
 $labels['createnewtask'] = 'Create new Task (e.g. Saturday, Mow the lawn)';
 $labels['createfrommail'] = 'Save as task';
 $labels['printtitle'] = 'Print tasks';
 $labels['printdescriptions'] = 'Print descriptions';
 $labels['mark'] = 'Mark';
 $labels['unmark'] = 'Unmark';
 $labels['edit'] = 'Edit';
 $labels['delete'] = 'Delete';
 $labels['title'] = 'Title';
 $labels['description'] = 'Description';
 $labels['datetime'] = 'Due';
 $labels['duetime'] = 'Due time';
 $labels['start'] = 'Start';
 $labels['starttime'] = 'Start time';
 $labels['alarms'] = 'Reminder';
 $labels['repeat'] = 'Repeat';
 $labels['links'] = 'Reference';
 $labels['status'] = 'Status';
 $labels['status-needs-action'] = 'Needs action';
 $labels['status-in-process'] = 'In process';
 $labels['status-completed'] = 'Completed';
 $labels['status-cancelled'] = 'Cancelled';
 $labels['assignedto'] = 'Assigned to';
 $labels['created'] = 'Created';
 $labels['changed'] = 'Last Modified';
 $labels['taskoptions'] = 'Options';
 
 $labels['all'] = 'All';
 $labels['flagged'] = 'Flagged';
 $labels['complete'] = 'Complete';
 $labels['completeness'] = 'Progress';
 $labels['overdue'] = 'Overdue';
 $labels['today'] = 'Today';
 $labels['tomorrow'] = 'Tomorrow';
 $labels['next7days'] = 'Next 7 days';
 $labels['later'] = 'Later';
 $labels['assigned'] = 'Assigned';
 $labels['assignedtitle'] = 'Tasks you assigned to others';
 $labels['mytasks'] = 'My tasks';
 $labels['mytaskstitle'] = 'Tasks assigned to you';
 $labels['nodate'] = 'no date';
 $labels['removetag'] = 'Remove';
 $labels['removelink'] = 'Remove email reference';
 $labels['auto'] = 'Auto';
 
 $labels['taskdetails'] = 'Details';
 $labels['newtask'] = 'New Task';
 $labels['edittask'] = 'Edit Task';
 $labels['save'] = 'Save';
 $labels['cancel'] = 'Cancel';
 $labels['saveandnotify'] = 'Save and Notify';
 $labels['addsubtask'] = 'Add subtask';
 $labels['deletetask'] = 'Delete task';
 $labels['deletethisonly'] = 'Delete this task only';
 $labels['deletewithchilds'] = 'Delete with all subtasks';
 $labels['taskactions'] = 'Task options...';
 
 $labels['tabsummary'] = 'Summary';
 $labels['tabrecurrence'] = 'Recurrence';
 $labels['tabassignments'] = 'Assignments';
 $labels['tabattachments'] = 'Attachments';
 $labels['tabsharing'] = 'Sharing';
 
 $labels['editlist'] = 'Edit list';
 $labels['createlist'] = 'Add list';
 $labels['listactions'] = 'List options...';
 $labels['listname'] = 'Name';
 $labels['showalarms'] = 'Show reminders';
 $labels['import'] = 'Import';
 $labels['viewactions'] = 'View actions';
 $labels['focusview'] = 'View only this list';
 
 // date words
 $labels['on'] = 'on';
 $labels['at'] = 'at';
 $labels['this'] = 'this';
 $labels['next'] = 'next';
 $labels['yes'] = 'yes';
 
 // messages
 $labels['savingdata'] = 'Saving data...';
 $labels['errorsaving'] = 'Failed to save data.';
 $labels['notasksfound'] = 'No tasks found for the given criteria';
 $labels['invalidstartduedates'] = 'Start date must not be greater than due date.';
 $labels['invalidstartduetimes'] = 'Start and due dates must either both or none specify a time.';
 $labels['recurrencerequiresdate'] = 'Recurring tasks require either a start or due date.';
 $labels['deletetasktconfirm'] = 'Do you really want to delete this task?';
 $labels['deleteparenttasktconfirm'] = 'Do you really want to delete this task and all its subtasks?';
 $labels['deletelistconfirm'] = 'Do you really want to delete this list with all its tasks?';
 $labels['deletelistconfirmrecursive'] = 'Do you really want to delete this list with all its sub-lists and tasks?';
 $labels['aclnorights'] = 'You do not have administrator rights on this task list.';
 $labels['changetaskconfirm'] = 'Update task';
 $labels['changeconfirmnotifications'] = 'Do you want to notify the attendees about the modification?';
 $labels['partstatupdatenotification'] = 'Do you want to notify the organizer about the status change?';
 
 // (hidden) titles and labels for accessibility annotations
 $labels['quickaddinput'] = 'New task date and title';
 $labels['arialabelquickaddbox'] = 'Quick add new task';
 $labels['arialabelsearchform'] = 'Task search form';
 $labels['arialabelquicksearchbox'] = 'Task search input';
 $labels['arialabellistsearchform'] = 'Tasklists search form';
 $labels['arialabeltaskselector'] = 'List mode';
 $labels['arialabeltasklisting'] = 'Tasks listing';
 
 // attendees
 $labels['attendee'] = 'Assignee';
 $labels['role'] = 'Role';
 $labels['availability'] = 'Avail.';
 $labels['confirmstate'] = 'Status';
 $labels['addattendee'] = 'Add assignee';
 $labels['roleorganizer'] = 'Organizer';
 $labels['rolerequired'] = 'Required';
 $labels['roleoptional'] = 'Optional';
 $labels['rolechair'] = 'Chair';
 $labels['rolenonparticipant'] = 'Observer';
 $labels['sendinvitations'] = 'Send invitations';
 $labels['sendnotifications'] = 'Notify assignees about modifications';
 $labels['sendcancellation'] = 'Notify assignees about task cancellation';
 $labels['invitationsubject'] = 'You\'ve been assigned to "$title"';
 $labels['invitationmailbody'] = "*\$title*\n\nDue: \$date\n\nAssignees: \$attendees\n\nPlease find attached an iCalendar file with all the task details which you can import to your tasks application.";
 $labels['itipupdatesubject'] = '"$title" has been updated';
 $labels['itipupdatesubjectempty'] = 'A task that concerns you has been updated';
 $labels['itipupdatemailbody'] = "*\$title*\n\nDue: \$date\n\nAssignees: \$attendees\n\nPlease find attached an iCalendar file with the updated task details which you can import to your tasks application.";
 $labels['itipcancelsubject'] = '"$title" has been cancelled';
 $labels['itipcancelmailbody'] = "*\$title*\n\nDue: \$date\n\nAssignees: \$attendees\n\nThe task has been cancelled by \$organizer.\n\nPlease find attached an iCalendar file with the updated task details.";
 $labels['saveintasklist'] = 'save in ';
 
 // history dialog
 $labels['taskhistory'] = 'History';
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
 $labels['objectnotfound'] = 'Failed to load task data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this task';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
 $labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this task? This will replace the current task with the old version.';
 $labels['objectrestoresuccess'] = 'Revision $rev successfully restored';
 $labels['objectrestoreerror'] = 'Failed to restore the old revision';
 
 // invitation handling (overrides labels from libcalendaring)
 $labels['itipobjectnotfound'] = 'The task referred by this message was not found in your tasks list.';
 
 $labels['itipmailbodyaccepted'] = "\$sender has accepted the assignment to the following task:\n\n*\$title*\n\nDue: \$date\n\nAssignees: \$attendees";
 $labels['itipmailbodytentative'] = "\$sender has tentatively accepted the assignment to the following task:\n\n*\$title*\n\nDue: \$date\n\nAssignees: \$attendees";
 $labels['itipmailbodydeclined'] = "\$sender has declined the assignment to the following task:\n\n*\$title*\n\nDue: \$date\n\nAssignees: \$attendees";
 $labels['itipmailbodycancel'] = "\$sender has rejected your assignment to the following task:\n\n*\$title*\n\nDue: \$date";
 $labels['itipmailbodyin-process'] = "\$sender has set the status of the following task to in-process:\n\n*\$title*\n\nDue: \$date";
 $labels['itipmailbodycompleted'] = "\$sender has completed the following task:\n\n*\$title*\n\nDue: \$date";
 $labels['itipmailbodydelegated'] = "\$sender has delegated the following task:\n\n*\$title*\n\nDue: \$date";
 $labels['itipmailbodydelegatedto'] = "\$sender has delegated the following task to you:\n\n*\$title*\n\nDue: \$date";
 
 $labels['attendeeaccepted'] = 'Assignee has accepted';
 $labels['attendeetentative'] = 'Assignee has tentatively accepted';
 $labels['attendeedeclined'] = 'Assignee has declined';
 $labels['attendeedelegated'] = 'Assignee has delegated to $delegatedto';
 $labels['attendeein-process'] = 'Assignee is in-process';
 $labels['attendeecompleted'] = 'Assignee has completed';
 
 $labels['acceptinvitation'] = 'Do you accept this assignment?';
 $labels['itipdeclinetask'] = 'Decline your assignment to this task to the organizer';
 $labels['declinedeleteconfirm'] = 'Do you also want to delete this declined task from your tasks list?';
 $labels['itipcomment'] = 'Invitation/notification comment';
 $labels['itipcommenttitle'] = 'This comment will be attached to the invitation/notification message sent to assignees';
 $labels['itipsendsuccess'] = 'Notification sent to assignees';
 $labels['errornotifying'] = 'Failed to send notifications to task assignees';
 $labels['removefromcalendar'] = 'Remove from my tasks';
 $labels['delegateinvitation'] = 'Delegate assignment';
 
 $labels['andnmore'] = '$nr more...';
-$labels['delegatedto'] = 'Delegated to: ';
-$labels['delegatedfrom'] = 'Delegated from: ';
 $labels['savetotasklist'] = 'Save to tasks';
 $labels['comment'] = 'Comment';
 $labels['errorimportingtask'] = 'Failed to import task(s)';
 $labels['importwarningexists'] = 'A copy of this task already exists in your tasklist.';
 $labels['importsuccess'] = 'Successfully imported $nr tasks';
 $labels['newerversionexists'] = 'A newer version of this task already exists! Aborted.';
 $labels['nowritetasklistfound'] = 'No tasklist found to save the task';
 $labels['importedsuccessfully'] = 'The task was successfully added to \'$list\'';
 $labels['updatedsuccessfully'] = 'The task was successfully updated in \'$list\'';
 $labels['attendeupdateesuccess'] = 'Successfully updated the participant\'s status';
 $labels['itipresponseerror'] = 'Failed to send the response to this task assignment';
 $labels['itipinvalidrequest'] = 'This invitation is no longer valid';
 $labels['sentresponseto'] = 'Successfully sent assignment response to $mailto';
 $labels['successremoval'] = 'The task has been deleted successfully.';
 $labels['invalidlistproperties'] = 'Invalid list properties! Please set a valid name.';
 $labels['arialabelsortmenu'] = 'Tasks sorting options';
diff --git a/plugins/tasklist/tasklist.js b/plugins/tasklist/tasklist.js
index abfd5933..2abba90b 100644
--- a/plugins/tasklist/tasklist.js
+++ b/plugins/tasklist/tasklist.js
@@ -1,3458 +1,3458 @@
 /**
  * Client scripts for the Tasklist plugin
  *
  * @author Thomas Bruederli <bruederli@kolabsys.com>
  *
  * @licstart  The following is the entire license notice for the
  * JavaScript code in this file.
  *
  * Copyright (C) 2012-2015, Kolab Systems AG <contact@kolabsys.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  *
  * @licend  The above is the entire license notice
  * for the JavaScript code in this file.
  */
  
 function rcube_tasklist_ui(settings)
 {
     // extend base class
     rcube_libcalendaring.call(this, settings);
 
     /*  constants  */
     var FILTER_MASK_ALL = 0;
     var FILTER_MASK_TODAY = 1;
     var FILTER_MASK_TOMORROW = 2;
     var FILTER_MASK_WEEK = 4;
     var FILTER_MASK_LATER = 8;
     var FILTER_MASK_NODATE = 16;
     var FILTER_MASK_OVERDUE = 32;
     var FILTER_MASK_FLAGGED = 64;
     var FILTER_MASK_COMPLETE = 128;
     var FILTER_MASK_ASSIGNED = 256;
     var FILTER_MASK_MYTASKS = 512;
 
     var filter_masks = {
         all:      FILTER_MASK_ALL,
         today:    FILTER_MASK_TODAY,
         tomorrow: FILTER_MASK_TOMORROW,
         week:     FILTER_MASK_WEEK,
         later:    FILTER_MASK_LATER,
         nodate:   FILTER_MASK_NODATE,
         overdue:  FILTER_MASK_OVERDUE,
         flagged:  FILTER_MASK_FLAGGED,
         complete: FILTER_MASK_COMPLETE,
         assigned: FILTER_MASK_ASSIGNED,
         mytasks:  FILTER_MASK_MYTASKS
     };
 
     /*  private vars  */
     var tagsfilter = [];
     var filtermask = FILTER_MASK_ALL;
     var loadstate = { filter:-1, lists:'', search:null };
     var idcount = 0;
     var focusview = false;
     var focusview_lists = [];
     var saving_lock;
     var ui_loading;
     var taskcounts = {};
     var listindex = [];
     var listdata = {};
     var tags = [];
     var draghelper;
     var search_request;
     var search_query;
     var completeness_slider;
     var task_draghelper;
     var tag_draghelper;
     var task_drag_active = false;
     var list_scroll_top = 0;
     var scroll_delay = 400;
     var scroll_step = 5;
     var scroll_speed = 20;
     var scroll_sensitivity = 40;
     var scroll_timer;
     var tasklists_widget;
     var focused_task;
     var focused_subclass;
     var task_attendees = [];
     var attendees_list;
     var me = this;
 
     // general datepicker settings
     var datepicker_settings = {
       // translate from PHP format to datepicker format
       dateFormat: settings['date_format'].replace(/M/g, 'm').replace(/mmmmm/, 'MM').replace(/mmm/, 'M').replace(/dddd/, 'DD').replace(/ddd/, 'D').replace(/yy/g, 'y'),
       firstDay : settings['first_day'],
 //      dayNamesMin: settings['days_short'],
 //      monthNames: settings['months'],
 //      monthNamesShort: settings['months'],
       changeMonth: false,
       showOtherMonths: true,
       selectOtherMonths: true
     };
     var extended_datepicker_settings;
 
     /*  public members  */
     this.tasklists = rcmail.env.tasklists;
     this.selected_task;
     this.selected_list;
 
     /*  public methods  */
     this.init = init;
     this.edit_task = task_edit_dialog;
     this.print_tasks = print_tasks;
     this.delete_task = delete_task;
     this.add_childtask = add_childtask;
     this.quicksearch = quicksearch;
     this.reset_search = reset_search;
     this.expand_collapse = expand_collapse;
     this.list_delete = list_delete;
     this.list_remove = list_remove;
     this.list_showurl = list_showurl;
     this.list_edit_dialog = list_edit_dialog;
     this.unlock_saving = unlock_saving;
 
     /* imports */
     var Q = this.quote_html;
     var text2html = this.text2html;
     var event_date_text = this.event_date_text;
     var parse_datetime = this.parse_datetime;
     var date2unixtime = this.date2unixtime;
     var fromunixtime = this.fromunixtime;
     var render_message_links = this.render_message_links;
 
     /**
      * initialize the tasks UI
      */
     function init()
     {
         if (rcmail.env.action == 'print' && rcmail.task == 'tasks') {
             filtermask = rcmail.env.filtermask;
             data_ready({data: rcmail.env.tasks});
             return;
         }
 
         // initialize task list selectors
         for (var id in me.tasklists) {
             if (settings.selected_list && me.tasklists[settings.selected_list] && !me.tasklists[settings.selected_list].active) {
                 me.tasklists[settings.selected_list].active = true;
                 me.selected_list = settings.selected_list;
                 $(rcmail.gui_objects.tasklistslist).find("input[value='"+settings.selected_list+"']").prop('checked', true);
             }
             if (me.tasklists[id].editable && (!me.selected_list || me.tasklists[id].default || (me.tasklists[id].active && !me.tasklists[me.selected_list].active))) {
                 me.selected_list = id;
             }
         }
 
         if (rcmail.env.source && me.tasklists[rcmail.env.source])
             me.selected_list = rcmail.env.source;
 
         // initialize treelist widget that controls the tasklists list
         var widget_class = window.kolab_folderlist || rcube_treelist_widget;
         tasklists_widget = new widget_class(rcmail.gui_objects.tasklistslist, {
             id_prefix: 'rcmlitasklist',
             selectable: true,
             save_state: true,
             keyboard: false,
             searchbox: '#tasklistsearch',
             search_action: 'tasks/tasklist',
             search_sources: [ 'folders', 'users' ],
             search_title: rcmail.gettext('listsearchresults','tasklist')
         });
         tasklists_widget.addEventListener('select', function(node) {
             var id = $(this).data('id');
             rcmail.enable_command('list-edit', has_permission(me.tasklists[node.id], 'wa'));
             rcmail.enable_command('list-delete', has_permission(me.tasklists[node.id], 'xa'));
             rcmail.enable_command('list-import', has_permission(me.tasklists[node.id], 'i'));
             rcmail.enable_command('list-remove', me.tasklists[node.id] && me.tasklists[node.id].removable);
             rcmail.enable_command('list-showurl', me.tasklists[node.id] && !!me.tasklists[node.id].caldavurl);
             me.selected_list = node.id;
             rcmail.update_state({source: node.id});
         });
         tasklists_widget.addEventListener('subscribe', function(p) {
             var list;
             if ((list = me.tasklists[p.id])) {
                 list.subscribed = p.subscribed || false;
                 rcmail.http_post('tasklist', { action:'subscribe', l:{ id:p.id, active:list.active?1:0, permanent:list.subscribed?1:0 } });
             }
         });
         tasklists_widget.addEventListener('remove', function(p) {
             if (me.tasklists[p.id] && me.tasklists[p.id].removable) {
                 list_remove(p.id);
             }
         });
         tasklists_widget.addEventListener('insert-item', function(p) {
             var list = p.data;
             if (list && list.id && !list.virtual) {
                 me.tasklists[list.id] = list;
                 var prop = { id:p.id, active:list.active?1:0 };
                 if (list.subscribed) prop.permanent = 1;
                 rcmail.http_post('tasklist', { action:'subscribe', l:prop });
                 list_tasks();
                 $(p.item).data('type', 'tasklist');
             }
         });
         tasklists_widget.addEventListener('search-complete', function(data) {
             if (data.length)
                 rcmail.display_message(rcmail.gettext('nrtasklistsfound','tasklist').replace('$nr', data.length), 'voice');
             else
                 rcmail.display_message(rcmail.gettext('notasklistsfound','tasklist'), 'info');
         });
 
         // init (delegate) event handler on tasklist checkboxes
         tasklists_widget.container.on('click', 'input[type=checkbox]', function(e) {
             var list, id = this.value;
             if ((list = me.tasklists[id])) {
                 list.active = this.checked;
                 fetch_counts();
                 if (!this.checked) remove_tasks(id);
                 else               list_tasks(null);
                 rcmail.http_post('tasklist', { action:'subscribe', l:{ id:id, active:list.active?1:0 } });
 
                 // disable focusview
                 if (!this.checked && focusview && $.inArray(id, focusview_lists) >= 0) {
                     set_focusview(null);
                 }
 
                 // adjust checked state of original list item
                 if (tasklists_widget.is_search()) {
                   tasklists_widget.container.find('input[value="'+id+'"]').prop('checked', this.checked);
                 }
             }
             e.stopPropagation();
         })
         .on('keypress', 'input[type=checkbox]', function(e) {
             // select tasklist on <Enter>
             if (e.keyCode == 13) {
                 tasklists_widget.select(this.value);
                 return rcube_event.cancel(e);
             }
         })
         .find('li:not(.virtual)').data('type', 'tasklist');
 
         // handler for clicks on quickview buttons
         tasklists_widget.container.on('click', '.quickview', function(e){
             var id = $(this).closest('li').attr('id').replace(/^rcmlitasklist/, '');
 
             if (tasklists_widget.is_search())
               id = id.replace(/--xsR$/, '');
 
             if (!rcube_event.is_keyboard(e) && this.blur)
               this.blur();
 
             set_focusview(id, e.shiftKey || e.metaKey || e.ctrlKey);
             e.stopPropagation();
             return false;
         });
 
         // register dbl-click handler to open calendar edit dialog
         tasklists_widget.container.on('dblclick', ':not(.virtual) > .tasklist', function(e){
             var id = $(this).closest('li').attr('id').replace(/^rcmlitasklist/, '');
 
             if (tasklists_widget.is_search())
               id = id.replace(/--xsR$/, '');
 
             list_edit_dialog(id);
         });
 
         if (me.selected_list) {
             rcmail.enable_command('addtask', true);
             tasklists_widget.select(me.selected_list);
         }
 
         // register server callbacks
         rcmail.addEventListener('plugin.data_ready', data_ready);
         rcmail.addEventListener('plugin.update_task', update_taskitem);
         rcmail.addEventListener('plugin.refresh_tasks', function(p) { update_taskitem(p, true); });
         rcmail.addEventListener('plugin.update_counts', update_counts);
         rcmail.addEventListener('plugin.insert_tasklist', insert_list);
         rcmail.addEventListener('plugin.update_tasklist', update_list);
         rcmail.addEventListener('plugin.destroy_tasklist', destroy_list);
         rcmail.addEventListener('plugin.unlock_saving', unlock_saving);
         rcmail.addEventListener('requestrefresh', before_refresh);
         rcmail.addEventListener('plugin.reload_data', function(){
             list_tasks(null, true);
             setTimeout(fetch_counts, 200);
         });
 
         rcmail.addEventListener('plugin.task_render_changelog', task_render_changelog);
         rcmail.addEventListener('plugin.task_show_diff', task_show_diff);
         rcmail.addEventListener('plugin.task_show_revision', function(data){ task_show_dialog(null, data, true); });
         rcmail.addEventListener('plugin.close_history_dialog', close_history_dialog);
 
         rcmail.register_command('list-sort', list_set_sort, true);
         rcmail.register_command('list-order', list_set_order, (settings.sort_col || 'auto') != 'auto');
         rcmail.register_command('task-history', task_history_dialog, false);
 
         $('#taskviewsortmenu .by-' + (settings.sort_col || 'auto')).attr('aria-checked', 'true').addClass('selected');
         $('#taskviewsortmenu .sortorder.' + (settings.sort_order || 'asc')).attr('aria-checked', 'true').addClass('selected');
 
         // start loading tasks
         fetch_counts();
         list_tasks(settings.selected_filter);
 
         // register event handlers for UI elements
         $('#taskselector a').click(function(e) {
             if (!$(this).parent().hasClass('inactive')) {
                 var selector = this.href.replace(/^.*#/, ''),
                     mask = filter_masks[selector],
                     shift = e.shiftKey || e.ctrlKey || e.metaKey;
 
                 if (!shift)
                     filtermask = mask;  // reset selection on regular clicks
                 else if (filtermask & mask)
                     filtermask -= mask;
                 else
                     filtermask |= mask;
 
                 list_tasks();
             }
             return false;
         });
 
         // quick-add a task
         $(rcmail.gui_objects.quickaddform).submit(function(e){
             var tasktext = this.elements.text.value,
                 rec = { id:-(++idcount), title:tasktext, readonly:true, mask:0, complete:0 };
 
             if (tasktext && tasktext.length) {
                 save_task({ tempid:rec.id, raw:tasktext, list:me.selected_list }, 'new');
                 render_task(rec);
 
                 $('#listmessagebox').hide();
             }
 
             // clear form
             this.reset();
             return false;
         }).find('input[type=text]').placeholder(rcmail.gettext('createnewtask','tasklist'));
 
         // click-handler on tags list
         $(rcmail.gui_objects.tagslist).on('click', 'li', function(e){
             var item = e.target.nodeName == 'LI' ? $(e.target) : $(e.target).closest('li'),
                 tag = item.data('value');
 
             if (!tag)
                 return false;
 
             // reset selection on regular clicks
             var index = $.inArray(tag, tagsfilter);
             var shift = e.shiftKey || e.ctrlKey || e.metaKey;
 
             if (!shift) {
                 if (tagsfilter.length > 1)
                     index = -1;
 
                 $('li', rcmail.gui_objects.tagslist).removeClass('selected').attr('aria-checked', 'false');
                 tagsfilter = [];
             }
 
             // add tag to filter
             if (index < 0) {
                 item.addClass('selected').attr('aria-checked', 'true');
                 tagsfilter.push(tag);
             }
             else if (shift) {
                 item.removeClass('selected').attr('aria-checked', 'false');
                 var a = tagsfilter.slice(0,index);
                 tagsfilter = a.concat(tagsfilter.slice(index+1));
             }
 
             list_tasks();
 
             // clear text selection in IE after shift+click
             if (shift && document.selection)
               document.selection.empty();
 
             e.preventDefault();
             return false;
         })
         .on('keypress', 'li', function(e) {
             if (e.keyCode == 13) {
                 $(this).trigger('click', { pointerType:'keyboard' });
             }
         })
         .mousedown(function(e){
             // disable content selection with the mouse
             e.preventDefault();
             return false;
         });
 
         // click-handler on task list items (delegate)
         $(rcmail.gui_objects.resultlist).on('click', function(e){
             var item = $(e.target);
             var className = e.target.className;
 
             if (item.hasClass('childtoggle')) {
                 item = item.parent().find('.taskhead');
                 className = 'childtoggle';
             }
             else if (!item.hasClass('taskhead'))
                 item = item.closest('div.taskhead');
 
             // ignore
             if (!item.length)
                 return false;
 
             var id = item.data('id'),
                 li = item.parent(),
                 rec = listdata[id];
 
             switch (className) {
                 case 'childtoggle':
                     rec.collapsed = !rec.collapsed;
                     li.children('.childtasks:first').toggle().attr('aria-hidden', rec.collapsed ? 'true' : 'false');
                     $(e.target).toggleClass('collapsed').html(rec.collapsed ? '&#9654;' : '&#9660;');
                     rcmail.http_post('tasks/task', { action:'collapse', t:{ id:rec.id, list:rec.list }, collapsed:rec.collapsed?1:0 });
                     if (e.shiftKey)  // expand/collapse all childs
                         li.children('.childtasks:first .childtoggle.'+(rec.collapsed?'expanded':'collapsed')).click();
                     break;
 
                 case 'complete':
                     if (rcmail.busy)
                         return false;
 
                     save_task_confirm(rec, 'edit', { _status_before:rec.status + '', status:e.target.checked ? 'COMPLETED' : (rec.complete > 0 ? 'IN-PROCESS' : 'NEEDS-ACTION') });
                     item.toggleClass('complete');
                     return true;
 
                 case 'flagged':
                     if (rcmail.busy)
                         return false;
 
                     rec.flagged = rec.flagged ? 0 : 1;
                     item.toggleClass('flagged').find('.flagged:first').attr('aria-checked', (rec.flagged ? 'true' : 'false'));
                     save_task(rec, 'edit');
                     break;
 
                 case 'date':
                     if (rcmail.busy)
                         return false;
 
                     var link = $(e.target).html(''),
                         input = $('<input type="text" size="10" />').appendTo(link).val(rec.date || '')
 
                     input.datepicker($.extend({
                         onClose: function(dateText, inst) {
                             if (dateText != (rec.date || '')) {
                                 save_task_confirm(rec, 'edit', { date:dateText });
                             }
                             input.datepicker('destroy').remove();
                             link.html(dateText || rcmail.gettext('nodate','tasklist'));
                         }
                       }, extended_datepicker_settings)
                     )
                     .datepicker('setDate', rec.date)
                     .datepicker('show');
                     break;
 
                 case 'delete':
                     delete_task(id);
                     break;
 
                 case 'actions':
                     var pos, ref = $(e.target),
                         menu = $('#taskitemmenu');
 
                     if (menu.is(':visible') && menu.data('refid') == id) {
                         rcmail.command('menu-close', 'taskitemmenu');
                     }
                     else {
                         rcmail.enable_command('task-history', me.tasklists[rec.list] && !!me.tasklists[rec.list].history);
                         rcmail.command('menu-open', { menu: 'taskitemmenu', show: true }, e.target, e);
                         menu.data('refid', id);
                         me.selected_task = rec;
                     }
                     e.bubble = false;
                     break;
 
                 case 'extlink':
                     return true;
 
                 default:
                     if (e.target.nodeName != 'INPUT')
                         task_show_dialog(id);
                     break;
             }
 
             return false;
         })
         .on('dblclick', '.taskhead, .childtoggle', function(e){
             var id, rec, item = $(e.target);
             if (!item.hasClass('taskhead'))
                 item = item.closest('div.taskhead');
 
             if (!rcmail.busy && item.length && (id = item.data('id')) && (rec = listdata[id])) {
                 var list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] : {};
                 if (rec.readonly || !list.editable)
                     task_show_dialog(id);
                 else
                     task_edit_dialog(id, 'edit');
                 clearSelection();
             }
         })
         .on('keydown', '.taskhead', function(e) {
             if (e.target.nodeName == 'INPUT' && e.target.type == 'text')
                 return true;
 
             var inc = 1;
             switch (e.keyCode) {
                 case 13:  // Enter
                     $(e.target).trigger('click', { pointerType:'keyboard' });
                     return rcube_event.cancel(e);
 
                 case 38: // Up arrow key
                     inc = -1;
                 case 40: // Down arrow key
                     if ($(e.target).hasClass('actions')) {
                         // unfold actions menu
                         $(e.target).trigger('click', { pointerType:'keyboard' });
                         return rcube_event.cancel(e);
                     }
 
                     // focus next/prev task item
                     var x = 0, target = this, items = $(rcmail.gui_objects.resultlist).find('.taskhead:visible');
                     items.each(function(i, item) {
                         if (item === target) {
                             x = i;
                             return false;
                         }
                     });
                     items.get(x + inc).focus();
                     return rcube_event.cancel(e);
 
                 case 37: // Left arrow key
                 case 39: // Right arrow key
                     $(this).parent().children('.childtoggle:visible').first().trigger('click', { pointerType:'keyboard' });
                     break;
             }
         })
         .on('focusin', '.taskhead', function(e){
             if (rcube_event.is_keyboard(e)) {
                 var item = $(e.target);
                 if (!item.hasClass('taskhead'))
                     item = item.closest('div.taskhead');
 
                 var id = item.data('id');
                 if (id && listdata[id]) {
                     focused_task = id;
                     focused_subclass = item.get(0) !== e.target ? e.target.className : null;
                 }
             }
         })
         .on('focusout', '.taskhead', function(e){
             var item = $(e.target);
             if (focused_task && item.data('id') == focused_task) {
                 focused_task = focused_subclass = null;
             }
         });
 
         /**
          *
          */
         function task_rsvp(response, delegate)
         {
             if (me.selected_task && me.selected_task.attendees && response) {
                 // bring up delegation dialog
                 if (response == 'delegated' && !delegate) {
                     rcube_libcalendaring.itip_delegate_dialog(function(data) {
                         $('#reply-comment-task-rsvp').val(data.comment);
                         data.rsvp = data.rsvp ? 1 : '';
                         task_rsvp('delegated', data);
                     });
                     return;
                 }
 
                 // update attendee status
                 for (var data, i=0; i < me.selected_task.attendees.length; i++) {
                     data = me.selected_task.attendees[i];
                     if (settings.identity.emails.indexOf(';'+String(data.email).toLowerCase()) >= 0) {
                         data.status = response.toUpperCase();
 
                         if (data.status == 'DELEGATED') {
                               data['delegated-to'] = delegate.to;
                         }
                         else {
                             delete data.rsvp;  // unset RSVP flag
 
                             if (data['delegated-to']) {
                               delete data['delegated-to'];
                               if (data.role == 'NON-PARTICIPANT' && data.status != 'DECLINED') {
                                   data.role = 'REQ-PARTICIPANT';
                               }
                             }
                         }
                     }
                 }
 
                 // submit status change to server
                 saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
                 rcmail.http_post('tasks/task', {
                     action: 'rsvp',
                     t: $.extend({}, me.selected_task, (delegate || {})),
                     filter: filtermask,
                     status: response,
                     noreply: $('#noreply-task-rsvp:checked').length ? 1 : 0,
                     comment: $('#reply-comment-task-rsvp').val()
                 });
 
                 task_show_dialog(me.selected_task.id);
             }
         }
 
         // init RSVP widget
         $('#task-rsvp input.button').click(function(e) {
             task_rsvp($(this).attr('rel'))
         });
 
         // register click handler for message links
         $('#task-links, #taskedit-links').on('click', 'li a.messagelink', function(e) {
             rcmail.open_window(this.href);
             return false;
         });
 
         // register click handler for message delete buttons
         $('#taskedit-links').on('click', 'li a.delete', function(e) {
             remove_link(e.target);
             return false;
         });
 
         // extended datepicker settings
         var extended_datepicker_settings = $.extend({
             showButtonPanel: true,
             beforeShow: function(input, inst) {
                 setTimeout(function(){
                     $(input).datepicker('widget').find('button.ui-datepicker-close')
                         .html(rcmail.gettext('nodate','tasklist'))
                         .attr('onclick', '')
                         .unbind('click')
                         .bind('click', function(e){
                             $(input).datepicker('setDate', null).datepicker('hide');
                         });
                 }, 1);
             }
         }, datepicker_settings);
     }
 
     /**
      * initialize task edit form elements
      */
     function init_taskedit()
     {
         $('#taskedit').tabs({
             activate: function(event, ui) {
                 // reset autocompletion on tab change (#3389)
                 if (ui.oldPanel.selector == '#taskedit-panel-attendees') {
                     rcmail.ksearch_blur();
                 }
             }
         });
 
         var completeness_slider_change = function(e, ui){
           var v = completeness_slider.slider('value');
           if (v >= 98) v = 100;
           if (v <= 2)  v = 0;
           $('#taskedit-completeness').val(v);
         };
         completeness_slider = $('#taskedit-completeness-slider').slider({
             range: 'min',
             animate: 'fast',
             slide: completeness_slider_change,
             change: completeness_slider_change
         });
         $('#taskedit-completeness').change(function(e){
             completeness_slider.slider('value', parseInt(this.value))
         });
 
         // register events on alarms and recurrence fields
         me.init_alarms_edit('#taskedit-alarms');
         me.init_recurrence_edit('#eventedit');
 
         $('#taskedit-date, #taskedit-startdate').datepicker(datepicker_settings);
 
         $('a.edit-nodate').click(function(){
             var sel = $(this).attr('rel');
             if (sel) $(sel).val('');
             return false;
         });
 
       // init attendees autocompletion
       var ac_props;
       // parallel autocompletion
       if (rcmail.env.autocomplete_threads > 0) {
         ac_props = {
           threads: rcmail.env.autocomplete_threads,
           sources: rcmail.env.autocomplete_sources
         };
       }
       rcmail.init_address_input_events($('#edit-attendee-name'), ac_props);
       rcmail.addEventListener('autocomplete_insert', function(e) {
           var success = false;
           if (e.field.name == 'participant') {
               success = add_attendees(e.insert, { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:(e.data && e.data.type == 'group' ? 'GROUP' : 'INDIVIDUAL') });
           }
           if (e.field && success) {
               e.field.value = '';
           }
       });
 
       $('#edit-attendee-add').click(function() {
           var input = $('#edit-attendee-name');
           rcmail.ksearch_blur();
           if (add_attendees(input.val(), { role:'REQ-PARTICIPANT', status:'NEEDS-ACTION', cutype:'INDIVIDUAL' })) {
               input.val('');
           }
       });
 
       // handle change of "send invitations" checkbox
       $('#edit-attendees-invite').change(function() {
         $('#edit-attendees-donotify,input.edit-attendee-reply').prop('checked', this.checked);
         // hide/show comment field
         $('#taskeditform .attendees-commentbox')[this.checked ? 'show' : 'hide']();
       });
 
       // delegate change task to "send invitations" checkbox
       $('#edit-attendees-donotify').change(function() {
         $('#edit-attendees-invite').click();
         return false;
       });
 
         // configure drop-down menu on time input fields based on jquery UI autocomplete
         $('#taskedit-starttime, #taskedit-time, #taskedit input.edit-alarm-time').each(function() {
             me.init_time_autocomplete(this, {container: '#taskedit'});
         });
     }
 
     /**
      * Check permissions on the given list object
      */
     function has_permission(list, perm)
     {
         // multiple chars means "either of"
         if (String(perm).length > 1) {
             for (var i=0; i < perm.length; i++) {
                 if (has_permission(list, perm[i])) {
                     return true;
                 }
             }
         }
 
         if (list.rights && String(list.rights).indexOf(perm) >= 0) {
             return true;
         }
 
         return (perm == 'i' && list.editable);
     }
 
     /**
      * Request counts from the server
      */
     function fetch_counts()
     {
         var active = active_lists();
         if (active.length)
             rcmail.http_request('counts', { lists:active.join(',') });
         else
             update_counts({});
     }
 
     /**
      * List tasks matching the given selector
      */
     function list_tasks(sel, force)
     {
         if (rcmail.busy)
             return;
 
         if (sel && filter_masks[sel] !== undefined) {
             filtermask = filter_masks[sel];
         }
 
         var active = active_lists(),
             basefilter = filtermask & FILTER_MASK_COMPLETE ? FILTER_MASK_COMPLETE : FILTER_MASK_ALL,
             reload = force || active.join(',') != loadstate.lists || basefilter != loadstate.filter || loadstate.search != search_query;
 
         if (active.length && reload) {
             ui_loading = rcmail.set_busy(true, 'loading');
             rcmail.http_request('fetch', { filter:basefilter, lists:active.join(','), q:search_query }, true);
         }
         else if (reload)
             data_ready({ data:[], lists:'', filter:basefilter, search:search_query });
         else
             render_tasklist();
 
         $('#taskselector li.selected').removeClass('selected').attr('aria-checked', 'false');
 
         // select all active selectors
         if (filtermask > 0) {
             $.each(filter_masks, function(sel, mask) {
                 if (filtermask & mask)
                     $('#taskselector li.'+sel).addClass('selected').attr('aria-checked', 'true');
             });
         }
         else
             $('#taskselector li.all').addClass('selected').attr('aria-checked', 'true');
     }
 
     /**
      * Remove all tasks of the given list from the UI
      */
     function remove_tasks(list_id)
     {
         // remove all tasks of the given list from index
         var newindex = $.grep(listindex, function(id, i){
             return listdata[id] && listdata[id].list != list_id;
         });
 
         listindex = newindex;
         render_tasklist();
 
         // avoid reloading
         me.tasklists[list_id].active = false;
         loadstate.lists = active_lists();
     }
 
     // open a tasks export dialog
     this.export_tasks = function()
     {
       // close show dialog first
       var $dialog = $("#tasksexport"),
         form = rcmail.gui_objects.exportform,
         buttons = {};
 
       if (!form)
         return;
 
       if ($dialog.is(':ui-dialog'))
         $dialog.dialog('close');
 
       $("#task-export-list").val('');
 
       buttons[rcmail.gettext('export', 'tasklist')] = function() {
         var data = {},
             source = $('#task-export-list option:selected').val(),
             form_elements = $('select, input', form);
 
         // "current view" export, use hidden form to POST task IDs
         if (source === '') {
           var cache = {}, tasks = [], inputs = [],
             postform = $('#tasks-export-form-post');
 
           $.each(listindex || [], function() {
             var rec = listdata[this];
             if (match_filter(rec, cache)) {
               tasks.push(rec.id);
             }
           });
 
           // copy form inputs, there may be controls added by other plugins
           form_elements.each(function() {
             if (this.type != 'checkbox' || this.checked)
               inputs.push($('<input>').attr({type: 'hidden', name: this.name, value: this.value}));
           });
 
           inputs.push($('<input>').attr({type: 'hidden', name: '_token', value: rcmail.env.request_token}));
           inputs.push($('<input>').attr({type: 'hidden', name: 'id', value: tasks.join(',')}));
 
           if (!postform.length)
             postform = $('<form>')
               .attr({style: 'display: none', method: 'POST', action: '?_task=tasks&_action=export'})
               .appendTo('body');
 
           postform.html('').append(inputs).submit();
         }
         // otherwise we can use simple GET
         else {
           form_elements.each(function() {
             if (this.type != 'checkbox' || this.checked)
               data[this.name] = $(this).val();
           });
 
           rcmail.goto_url('export', data);
         }
 
         $dialog.dialog("close");
       };
 
       buttons[rcmail.gettext('cancel', 'tasklist')] = function() {
         $dialog.dialog("close");
       };
 
       // open jquery UI dialog
       $dialog.dialog({
         modal: true,
         resizable: false,
         closeOnEscape: false,
         title: rcmail.gettext('exporttitle', 'tasklist'),
         open: function() {
           $dialog.parent().find('.ui-dialog-buttonset .ui-button').first().addClass('mainaction');
         },
         close: function() {
           $('.ui-dialog-buttonpane button', $dialog.parent()).button('enable');
           $dialog.dialog("destroy").hide();
         },
         buttons: buttons,
         width: 520
       }).show();
     };
 /*
     // download the selected task as iCal
     this.task_download = function(task)
     {
       if (task && task.id) {
         rcmail.goto_url('export', {source: task.list, id: task.id, attachments: 1});
       }
     };
 */
 
     /**
      * Modify query parameters for refresh requests
      */
     function before_refresh(query)
     {
         query.filter = filtermask == FILTER_MASK_COMPLETE ? FILTER_MASK_COMPLETE : FILTER_MASK_ALL;
         query.lists = active_lists().join(',');
         if (search_query)
             query.q = search_query;
 
         return query;
     }
 
     /**
      * Callback if task data from server is ready
      */
     function data_ready(response)
     {
         listdata = {};
         listindex = [];
         loadstate.lists = response.lists;
         loadstate.filter = response.filter;
         loadstate.search = response.search;
 
         for (var id, i=0; i < response.data.length; i++) {
             id = response.data[i].id;
             listindex.push(id);
             listdata[id] = response.data[i];
             listdata[id].children = [];
             // register a forward-pointer to child tasks
             if (listdata[id].parent_id && listdata[listdata[id].parent_id])
                 listdata[listdata[id].parent_id].children.push(id);
         }
 
         // sort index before rendering
         listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });
 
         append_tags(response.tags || []);
         render_tasklist();
 
         // show selected task dialog
         if (settings.selected_id) {
             if (listdata[settings.selected_id]) {
                 task_show_dialog(settings.selected_id);
                 delete settings.selected_id;
             }
 
             // remove _id from window location
             if (window.history.replaceState) {
                 window.history.replaceState({}, document.title, rcmail.url('', { _list: me.selected_list }));
             }
         }
 
         rcmail.set_busy(false, 'loading', ui_loading);
     }
 
     /**
      *
      */
     function render_tasklist()
     {
         // clear display
         var id, rec,
             count = 0,
             cache = {},
             activetags = {},
             msgbox = $('#listmessagebox').hide(),
             list = $(rcmail.gui_objects.resultlist).html('');
 
         for (var i=0; i < listindex.length; i++) {
             id = listindex[i];
             rec = listdata[id];
             if (match_filter(rec, cache)) {
                 if (rcmail.env.action == 'print') {
                     render_task_printmode(rec);
                     continue;
                 }
 
                 render_task(rec);
                 count++;
 
                 // keep a list of tags from all visible tasks
                 for (var t, j=0; rec.tags && j < rec.tags.length; j++) {
                     t = rec.tags[j];
                     if (typeof activetags[t] == 'undefined')
                         activetags[t] = 0;
                     activetags[t]++;
                 }
             }
         }
 
         if (rcmail.env.action == 'print')
             return;
 
         fix_tree_toggles();
         update_tagcloud(activetags);
 
         if (!count) {
             msgbox.html(rcmail.gettext('notasksfound','tasklist')).show();
             rcmail.display_message(rcmail.gettext('notasksfound','tasklist'), 'voice');
         }
     }
 
     /**
      * Show/hide child toggle buttons on all visible task items
      */
     function fix_tree_toggles()
     {
         $('.taskitem', rcmail.gui_objects.resultlist).each(function(i,elem){
             var li = $(elem),
                 rec = listdata[li.attr('rel')],
                 childs = $('.childtasks li', li);
 
             $('.childtoggle', li)[(childs.length ? 'show' : 'hide')]();
         })
     }
 
     /**
      * Expand/collapse all task items with childs
      */
     function expand_collapse(expand)
     {
         var collapsed = !expand;
 
         $('.taskitem .childtasks')[(collapsed ? 'hide' : 'show')]();
         $('.taskitem .childtoggle')
             .removeClass(collapsed ? 'expanded' : 'collapsed')
             .addClass(collapsed ? 'collapsed' : 'expanded')
             .html(collapsed ? '&#9654;' : '&#9660;');
 
         // store new toggle collapse states
         var ids = [];
         for (var id in listdata) {
             if (listdata[id].children && listdata[id].children.length)
                 ids.push(id);
         }
         if (ids.length) {
             rcmail.http_post('tasks/task', { action:'collapse', t:{ id:ids.join(',') }, collapsed:collapsed?1:0 });
         }
     }
 
     /**
      *
      */
     function append_tags(taglist)
     {
         // find new tags
         var newtags = [];
         for (var i=0; i < taglist.length; i++) {
             if ($.inArray(taglist[i], tags) < 0)
                 newtags.push(taglist[i]);
         }
         tags = tags.concat(newtags);
 
         // append new tags to tag cloud
         $.each(newtags, function(i, tag){
             $('<li role="checkbox" aria-checked="false" tabindex="0"></li>')
                 .attr('rel', tag)
                 .data('value', tag)
                 .html(Q(tag) + '<span class="count"></span>')
                 .appendTo(rcmail.gui_objects.tagslist)
                 .draggable({
                     addClasses: false,
                     revert: 'invalid',
                     revertDuration: 300,
                     helper: tag_draggable_helper,
                     start: tag_draggable_start,
                     appendTo: 'body',
                     cursor: 'pointer'
                 });
             });
 
         // re-sort tags list
         $(rcmail.gui_objects.tagslist).children('li').sortElements(function(a,b){
             return $.text([a]).toLowerCase() > $.text([b]).toLowerCase() ? 1 : -1;
         });
     }
 
     /**
      * Display the given counts to each tag and set those inactive which don't
      * have any matching tasks in the current view.
      */
     function update_tagcloud(counts)
     {
         // compute counts first by iterating over all visible task items
         if (typeof counts == 'undefined') {
             counts = {};
             $('li.taskitem', rcmail.gui_objects.resultlist).each(function(i,li){
                 var t, id = $(li).attr('rel'),
                     rec = listdata[id];
                 for (var j=0; rec && rec.tags && j < rec.tags.length; j++) {
                     t = rec.tags[j];
                     if (typeof counts[t] == 'undefined')
                         counts[t] = 0;
                     counts[t]++;
                 }
             });
         }
 
         $(rcmail.gui_objects.tagslist).children('li').each(function(i,li){
             var elem = $(li), tag = elem.attr('rel'),
                 count = counts[tag] || 0;
 
             elem.children('.count').html(count+'');
             if (count == 0) elem.addClass('inactive');
             else            elem.removeClass('inactive');
         });
     }
 
     /*  Helper functions for drag & drop functionality of tags  */
     
     function tag_draggable_helper()
     {
         if (!tag_draghelper)
             tag_draghelper = $('<div class="tag-draghelper"></div>');
         else
             tag_draghelper.html('');
 
         $(this).clone().addClass('tag').appendTo(tag_draghelper);
         return tag_draghelper;
     }
 
     function tag_draggable_start(event, ui)
     {
         $('.taskhead').droppable({
             hoverClass: 'droptarget',
             accept: tag_droppable_accept,
             drop: tag_draggable_dropped,
             addClasses: false
         });
     }
 
     function tag_droppable_accept(draggable)
     {
         if (rcmail.busy)
             return false;
 
         var tag = draggable.data('value'),
             drop_id = $(this).data('id'),
             drop_rec = listdata[drop_id],
             list = drop_rec && me.tasklists[drop_rec.list] ? me.tasklists[drop_rec.list] : { editable:true };
 
         // target is not editable or already has this tag assigned
         if (!drop_rec || drop_rec.readonly || !has_permission(list, 'i') || (drop_rec.tags && $.inArray(tag, drop_rec.tags) >= 0)) {
             return false;
         }
 
         return true;
     }
 
     function tag_draggable_dropped(event, ui)
     {
         var drop_id = $(this).data('id'),
             tag = ui.draggable.data('value'),
             rec = listdata[drop_id];
 
         if (rec && rec.id) {
             if (!rec.tags) rec.tags = [];
             rec.tags.push(tag);
             save_task(rec, 'edit');
         }
     }
 
     /**
      *
      */
     function update_counts(counts)
     {
         // got new data
         if (counts)
             taskcounts = counts;
 
         // iterate over all selector links and update counts
         $('#taskselector a').each(function(i, elem){
             var link = $(elem),
                 f = link.parent().attr('class').replace(/\s\w+/g, '');
             if (f != 'all')
                 link.children('span').html('+' + (taskcounts[f] || ''))[(taskcounts[f] ? 'show' : 'hide')]();
         });
 
         // spacial case: overdue
         $('#taskselector li.overdue')[(taskcounts.overdue ? 'removeClass' : 'addClass')]('inactive');
     }
 
     /**
      * Callback from server to update a single task item
      */
     function update_taskitem(rec, filter)
     {
         // handle a list of task records
         if ($.isArray(rec)) {
             $.each(rec, function(i,r){ update_taskitem(r, filter); });
             return;
         }
 
         var id = rec.id,
             oldid = rec.tempid || id,
             oldrec = listdata[oldid],
             oldindex = $.inArray(oldid, listindex),
             oldparent = oldrec ? (oldrec._old_parent_id || oldrec.parent_id) : null,
             list = me.tasklists[rec.list];
 
         if (oldindex >= 0)
             listindex[oldindex] = id;
         else
             listindex.push(id);
 
         listdata[id] = rec;
 
         // remove child-pointer from old parent
         if (oldparent && listdata[oldparent] && oldparent != rec.parent_id) {
             var oldchilds = listdata[oldparent].children,
                 i = $.inArray(oldid, oldchilds);
             if (i >= 0) {
                 listdata[oldparent].children = oldchilds.slice(0,i).concat(oldchilds.slice(i+1));
             }
         }
 
         // register a forward-pointer to child tasks
         if (rec.parent_id && listdata[rec.parent_id] && listdata[rec.parent_id].children && $.inArray(id, listdata[rec.parent_id].children) < 0)
             listdata[rec.parent_id].children.push(id);
 
         // restore pointers to my children
         if (!listdata[id].children) {
             listdata[id].children = [];
             for (var pid in listdata) {
                 if (listdata[pid].parent_id == id)
                     listdata[id].children.push(pid);
             }
         }
 
         // copy _depth property from old rec or derive from parent
         if (rec.parent_id && listdata[rec.parent_id]) {
             rec._depth = (listdata[rec.parent_id]._depth || 0) + 1;
         }
         else if (oldrec) {
             rec._depth = oldrec._depth || 0;
         }
 
         if (list.active || rec.tempid) {
             if (!filter || match_filter(rec, {}))
                 render_task(rec, oldid);
         }
         else {
             $('li[rel="'+id+'"]', rcmail.gui_objects.resultlist).remove();
         }
 
         append_tags(rec.tags || []);
         update_tagcloud();
         fix_tree_toggles();
 
         // refresh currently displayed task details dialog
         if ($('#taskshow').is(':visible') && me.selected_task && me.selected_task.id == rec.id) {
             task_show_dialog(rec.id);
         }
     }
 
     /**
      * Submit the given (changed) task record to the server
      */
     function save_task(rec, action)
     {
         // show confirmation dialog when status of an assigned task has changed
         if (rec._status_before !== undefined && is_attendee(rec))
             return save_task_confirm(rec, action);
 
         if (!rcmail.busy) {
             saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
             rcmail.http_post('tasks/task', { action:action, t:rec, filter:filtermask });
             $('button.ui-button:ui-button').button('option', 'disabled', rcmail.busy);
             return true;
         }
 
         return false;
     }
 
     /**
      * Display confirm dialog when modifying/deleting a task record
      */
     var save_task_confirm = function(rec, action, updates)
     {
         var data = $.extend({}, rec, updates || {}),
           notify = false, partstat = false, html = '',
           do_confirm = settings.itip_notify & 2;
 
         // task has attendees, ask whether to notify them
         if (has_attendees(rec) && is_organizer(rec)) {
             notify = true;
             if (do_confirm) {
                 html = rcmail.gettext('changeconfirmnotifications', 'tasklist');
             }
             else {
                 data._notify = settings.itip_notify;
             }
         }
         // ask whether to change my partstat and notify organizer
         else if (data._status_before !== undefined && data.status && data._status_before != data.status && is_attendee(rec)) {
           partstat = true;
           if (do_confirm) {
               html = rcmail.gettext('partstatupdatenotification', 'tasklist');
           }
           else if (settings.itip_notify & 1) {
               data._reportpartstat = data.status == 'CANCELLED' ? 'DECLINED' : data.status;
           }
         }
 
         // remove to avoid endless recursion
         delete data._status_before;
 
         // show dialog
         if (html) {
             var $dialog = $('<div>').html(html);
 
             var buttons = [];
             buttons.push({
                 text: rcmail.gettext('saveandnotify', 'tasklist'),
                 click: function() {
                     if (notify)   data._notify = 1;
                     if (partstat) data._reportpartstat = data.status == 'CANCELLED' ? 'DECLINED' : data.status;
                     save_task(data, action);
                     $(this).dialog('close');
                 }
             });
             buttons.push({
                 text: rcmail.gettext('save', 'tasklist'),
                 click: function() {
                     save_task(data, action);
                     $(this).dialog('close');
                 }
             });
             buttons.push({
                 text: rcmail.gettext('cancel', 'tasklist'),
                 click: function() {
                     $(this).dialog('close');
                     if (updates)
                       render_task(rec, rec.id);  // restore previous state
                 }
             });
 
             $dialog.dialog({
                 modal: true,
                 width: 460,
                 closeOnEscapeType: false,
                 dialogClass: 'warning no-close',
                 title: rcmail.gettext('changetaskconfirm', 'tasklist'),
                 buttons: buttons,
                 open: function() {
                     setTimeout(function(){
                       $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
                     }, 5);
                 },
                 close: function(){
                     $dialog.dialog('destroy').remove();
                 }
             }).addClass('task-update-confirm').show();
 
             return true;
         }
 
         // do update
         return save_task(data, action);
     }
 
     /**
      * Remove saving lock and free the UI for new input
      */
     function unlock_saving()
     {
         if (saving_lock) {
             rcmail.set_busy(false, null, saving_lock);
             $('button.ui-button:ui-button').button('option', 'disabled', false);
         }
     }
 
     /**
      * Render the given task into the tasks list
      */
     function render_task(rec, replace)
     {
         var tags_html = '';
         for (var j=0; rec.tags && j < rec.tags.length; j++)
             tags_html += '<span class="tag">' + Q(rec.tags[j]) + '</span>';
 
         var label_id = rcmail.html_identifier(rec.id) + '-title';
         var div = $('<div>').addClass('taskhead').html(
             '<div class="progressbar"><div class="progressvalue" style="width:' + (rec.complete * 100) + '%"></div></div>' +
             '<input type="checkbox" name="completed[]" value="1" class="complete" aria-label="' + rcmail.gettext('complete','tasklist') + '" ' + (is_complete(rec) ? 'checked="checked" ' : '') + '/>' + 
             '<span class="flagged" role="checkbox" tabindex="0" aria-checked="' + (rec.flagged ? 'true' : 'false') + '" aria-label="' + rcmail.gettext('flagged','tasklist') + '"></span>' +
             '<span class="title" id="' + label_id + '">' + text2html(Q(rec.title)) + '</span>' +
             '<span class="tags">' + tags_html + '</span>' +
             '<span class="date">' + Q(rec.date || rcmail.gettext('nodate','tasklist')) + '</span>' +
             '<a href="#" class="actions" aria-haspopup="true" aria-expanded="false">' + rcmail.gettext('taskactions','tasklist') + '</a>'
             )
             .attr('tabindex', '0')
             .attr('aria-labelledby', label_id)
             .data('id', rec.id)
             .draggable({
                 revert: 'invalid',
                 addClasses: false,
                 cursorAt: { left:-10, top:12 },
                 helper: task_draggable_helper,
                 appendTo: 'body',
                 start: task_draggable_start,
                 stop: task_draggable_stop,
                 drag: task_draggable_move,
                 revertDuration: 300
             });
 
         if (is_complete(rec))
             div.addClass('complete');
         if (rec.flagged)
             div.addClass('flagged');
         if (!rec.date)
             div.addClass('nodate');
         if ((rec.mask & FILTER_MASK_OVERDUE))
             div.addClass('overdue');
 
         var li, inplace = false, parent = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : null;
         if (replace && (li = $('li[rel="'+replace+'"]', rcmail.gui_objects.resultlist)) && li.length) {
             li.children('div.taskhead').first().replaceWith(div);
             li.attr('rel', rec.id);
             inplace = true;
         }
         else {
             li = $('<li role="treeitem">')
                 .attr('rel', rec.id)
                 .addClass('taskitem')
                 .append((rec.collapsed ? '<span class="childtoggle collapsed">&#9654;' : '<span class="childtoggle expanded">&#9660;') + '</span>')
                 .append(div)
                 .append('<ul class="childtasks" role="group" style="' + (rec.collapsed ? 'display:none' : '') + '" aria-hidden="' + (rec.collapsed ? 'true' : 'false') +'"></ul>');
 
             if (!parent || !parent.length)
                 li.appendTo(rcmail.gui_objects.resultlist);
         }
 
         if (!inplace && parent && parent.length)
             li.appendTo(parent);
 
         if (replace) {
             resort_task(rec, li, true);
             // TODO: remove the item after a while if it doesn't match the current filter anymore
         }
 
         // re-set focus to taskhead element after DOM update
         if (focused_task == rec.id) {
             focus_task(li);
         }
     }
 
     /**
      * Render the given task into the tasks list (in print mode)
      */
     function render_task_printmode(rec)
     {
         var label_id = rcmail.html_identifier(rec.id) + '-title',
             div = $('<div>').addClass('taskhead')
                 .append($('<span class="title">').attr('id', label_id).text(rec.title)),
             parent = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : null,
             li = $('<li role="treeitem">').attr('rel', rec.id).addClass('taskitem')
                 .append(div)
                 .append('<ul class="childtasks" role="group"></ul>');
 
         if (rec.description)
             div.append($('<span class="description">').text(rec.description));
 /*
         if (is_complete(rec))
             div.addClass('complete');
         if (rec.flagged)
             div.addClass('flagged');
         if (!rec.date)
             div.addClass('nodate');
         if (rec.mask & FILTER_MASK_OVERDUE)
             div.addClass('overdue');
 */
         if (!parent || !parent.length)
             li.appendTo(rcmail.gui_objects.resultlist);
         else
             li.appendTo(parent);
     }
 
     /**
      * Move the given task item to the right place in the list
      */
     function resort_task(rec, li, animated)
     {
         var dir = 0, index, slice, cmp, next_li, next_id, next_rec, insert_after, past_myself;
 
         // animated moving
         var insert_animated = function(li, before, after) {
             if (before && li.next().get(0) == before.get(0))
                 return; // nothing to do
             else if (after && li.prev().get(0) == after.get(0))
                 return; // nothing to do
             
             var speed = 300;
             li.slideUp(speed, function(){
                 if (before)     li.insertBefore(before);
                 else if (after) li.insertAfter(after);
                 li.slideDown(speed, function(){
                     if (focused_task == rec.id) {
                         focus_task(li);
                     }
                 });
             });
         }
 
         // remove from list index
         var oldlist = listindex.join('%%%');
         var oldindex = $.inArray(rec.id, listindex);
         if (oldindex >= 0) {
             slice = listindex.slice(0,oldindex);
             listindex = slice.concat(listindex.slice(oldindex+1));
         }
 
         // find the right place to insert the task item
         li.parent().children('.taskitem').each(function(i, elem){
             next_li = $(elem);
             next_id = next_li.attr('rel');
             next_rec = listdata[next_id];
 
             if (next_id == rec.id) {
                 past_myself = true;
                 return 1; // continue
             }
 
             cmp = next_rec ? task_cmp(rec, next_rec) : 0;
 
             if (cmp > 0 || (cmp == 0 && !past_myself)) {
                 insert_after = next_li;
                 return 1; // continue;
             }
             else if (next_li && cmp < 0) {
                 if (animated) insert_animated(li, next_li);
                 else          li.insertBefore(next_li);
                 index = $.inArray(next_id, listindex);
                 return false; // break
             }
         });
 
         if (insert_after) {
             if (animated) insert_animated(li, null, insert_after);
             else          li.insertAfter(insert_after);
 
             next_id = insert_after.attr('rel');
             index = $.inArray(next_id, listindex);
         }
 
         // insert into list index
         if (next_id && index >= 0) {
             slice = listindex.slice(0,index);
             slice.push(rec.id);
             listindex = slice.concat(listindex.slice(index));
         }
         else {  // restore old list index
             listindex = oldlist.split('%%%');
         }
     }
 
     /**
      * Compare function of two task records.
      * (used for sorting)
      */
     function task_cmp(a, b)
     {
         // sort by hierarchy level first
         if ((a._depth || 0) != (b._depth || 0))
             return a._depth - b._depth;
 
         var p, alt, inv = 1, c = is_complete(a) - is_complete(b), d = c;
 
         // completed tasks always move to the end
         if (c != 0)
             return c;
 
         // custom sorting
         if (settings.sort_col && settings.sort_col != 'auto') {
             alt = settings.sort_col == 'datetime' || settings.sort_col == 'startdatetime' ? 99999999999 : 0
             d = (a[settings.sort_col]||alt) - (b[settings.sort_col]||alt);
             inv = settings.sort_order == 'desc' ? -1 : 1;
         }
         // default sorting (auto)
         else {
             if (!d) d = (b._hasdate-0) - (a._hasdate-0);
             if (!d) d = (a.datetime||99999999999) - (b.datetime||99999999999);
         }
 
         // fall-back to created/changed date
         if (!d) d = (a.created||0) - (b.created||0);
         if (!d) d = (a.changed||0) - (b.changed||0);
 
         return d * inv;
     }
 
     /**
      * Set focus on the given task item after DOM update
      */
     function focus_task(li)
     {
         var selector = '.taskhead';
         if (focused_subclass)
             selector += ' .' + focused_subclass
         li.find(selector).focus();
     }
 
     /**
      * Determine whether the given task should be displayed as "complete"
      */
     function is_complete(rec)
     {
         return ((rec.complete == 1.0 && !rec.status) || rec.status === 'COMPLETED') ? 1 : 0;
     }
 
     /**
      *
      */
     function get_all_childs(id)
     {
         var cid, childs = [];
         for (var i=0; listdata[id].children && i < listdata[id].children.length; i++) {
             cid = listdata[id].children[i];
             childs.push(cid);
             childs = childs.concat(get_all_childs(cid));
         }
 
         return childs;
     }
 
 
     /*  Helper functions for drag & drop functionality  */
     
     function task_draggable_helper()
     {
         if (!task_draghelper)
             task_draghelper = $('<div class="taskitem-draghelper">&#x2714;</div>');
 
         return task_draghelper;
     }
 
     function task_draggable_start(event, ui)
     {
         var opts = {
             hoverClass: 'droptarget',
             accept: task_droppable_accept,
             drop: task_draggable_dropped,
             addClasses: false
         };
 
         $('.taskhead, #rootdroppable').droppable(opts);
         tasklists_widget.droppable(opts);
 
         $(this).parent().addClass('dragging');
         $('#rootdroppable').show();
 
         // enable auto-scrolling of list container
         var container = $(rcmail.gui_objects.resultlist);
         if (container.height() > container.parent().height()) {
             task_drag_active = true;
             list_scroll_top = container.parent().scrollTop();
         }
     }
 
     function task_draggable_move(event, ui)
     {
         var scroll = 0,
             mouse = rcube_event.get_mouse_pos(event),
             container = $(rcmail.gui_objects.resultlist);
 
         mouse.y -= container.parent().offset().top;
 
         if (mouse.y < scroll_sensitivity && list_scroll_top > 0) {
             scroll = -1; // up
         }
         else if (mouse.y > container.parent().height() - scroll_sensitivity) {
             scroll = 1; // down
         }
 
         if (task_drag_active && scroll != 0) {
             if (!scroll_timer)
                 scroll_timer = window.setTimeout(function(){ tasklist_drag_scroll(container, scroll); }, scroll_delay);
         }
         else if (scroll_timer) {
             window.clearTimeout(scroll_timer);
             scroll_timer = null;
         }
     }
 
     function task_draggable_stop(event, ui)
     {
         $(this).parent().removeClass('dragging');
         $('#rootdroppable').hide();
         task_drag_active = false;
     }
 
     function task_droppable_accept(draggable)
     {
         if (rcmail.busy)
             return false;
 
         var drag_id = draggable.data('id'),
             drop_id = $(this).data('id'),
             drag_rec = listdata[drag_id] || {},
             drop_rec = listdata[drop_id];
 
         // drop target is another list
         if (drag_rec && $(this).data('type') == 'tasklist') {
             var  drop_list = me.tasklists[drop_id],
                from_list = me.tasklists[drag_rec.list];
             return !drag_rec.parent_id && drop_id != drag_rec.list && drop_list && drop_list.editable && from_list && from_list.editable;
         }
 
         if (drop_rec && drop_rec.list != drag_rec.list)
             return false;
 
         if (drop_id == drag_rec.parent_id)
             return false;
 
         while (drop_rec && drop_rec.parent_id) {
             if (drop_rec.parent_id == drag_id)
                 return false;
             drop_rec = listdata[drop_rec.parent_id];
         }
 
         return true;
     }
 
     function task_draggable_dropped(event, ui)
     {
         var drop_id = $(this).data('id'),
             task_id = ui.draggable.data('id'),
             rec = listdata[task_id],
             parent, li;
 
         // dropped on another list -> move
         if ($(this).data('type') == 'tasklist') {
             if (rec) {
                 save_task({ id:rec.id, list:drop_id, _fromlist:rec.list }, 'move');
                 rec.list = drop_id;
             }
         }
         // dropped on a new parent task or root
         else {
             parent = drop_id ? $('li[rel="'+drop_id+'"] > ul.childtasks', rcmail.gui_objects.resultlist) : $(rcmail.gui_objects.resultlist)
 
             if (rec && parent.length) {
                 // submit changes to server
                 rec._old_parent_id = rec.parent_id;
                 rec.parent_id = drop_id || 0;
                 save_task(rec, 'edit');
 
                 li = ui.draggable.parent();
                 li.slideUp(300, function(){
                     li.appendTo(parent);
                     resort_task(rec, li);
                     li.slideDown(300);
                     fix_tree_toggles();
                 });
             }
         }
     }
 
     /**
      * Scroll list container in the given direction
      */
     function tasklist_drag_scroll(container, dir)
     {
         if (!task_drag_active)
             return;
 
         var old_top = list_scroll_top;
         container.parent().get(0).scrollTop += scroll_step * dir;
         list_scroll_top = container.parent().scrollTop();
         scroll_timer = null;
 
         if (list_scroll_top != old_top)
             scroll_timer = window.setTimeout(function(){ tasklist_drag_scroll(container, dir); }, scroll_speed);
     }
 
     // check if the task has 'real' attendees, excluding the current user
     var has_attendees = function(task)
     {
         return !!(task.attendees && task.attendees.length && (task.attendees.length > 1 || String(task.attendees[0].email).toLowerCase() != settings.identity.email));
     };
 
     // check if the current user is an attendee of this task
     var is_attendee = function(task, email, role)
     {
         var i, attendee, emails = email ? ';' + email.toLowerCase() : settings.identity.emails;
 
         for (i=0; task.attendees && i < task.attendees.length; i++) {
             attendee = task.attendees[i];
             if ((!role || attendee.role == role) && attendee.email && emails.indexOf(';'+attendee.email.toLowerCase()) >= 0) {
                 return attendee;
             }
         }
 
         return false;
     };
 
     // check if the current user is the organizer
     var is_organizer = function(task, email)
     {
         if (!email) email = task.organizer ? task.organizer.email : null;
         if (email)
             return settings.identity.emails.indexOf(';'+email) >= 0;
         return true;
     };
 
     // add the given list of participants
     var add_attendees = function(names, params)
     {
         names = explode_quoted_string(names.replace(/,\s*$/, ''), ',');
 
         // parse name/email pairs
         var i, item, email, name, success = false;
         for (i=0; i < names.length; i++) {
             email = name = '';
             item = $.trim(names[i]);
 
             if (!item.length) {
                 continue;
             }
             // address in brackets without name (do nothing)
             else if (item.match(/^<[^@]+@[^>]+>$/)) {
                 email = item.replace(/[<>]/g, '');
             }
             // address without brackets and without name (add brackets)
             else if (rcube_check_email(item)) {
                 email = item;
             }
             // address with name
             else if (item.match(/([^\s<@]+@[^>]+)>*$/)) {
                 email = RegExp.$1;
                 name = item.replace(email, '').replace(/^["\s<>]+/, '').replace(/["\s<>]+$/, '');
             }
 
             if (email) {
                 add_attendee($.extend({ email:email, name:name }, params));
                 success = true;
             }
             else {
                 alert(rcmail.gettext('noemailwarning'));
             }
         }
 
         return success;
     };
 
     // add the given attendee to the list
     var add_attendee = function(data, readonly, before)
     {
         if (!me.selected_task)
             return false;
 
         // check for dupes...
         var exists = false;
         $.each(task_attendees, function(i, v) { exists |= (v.email == data.email); });
         if (exists)
             return false;
 
         var dispname = Q(data.name || data.email);
         if (data.email)
             dispname = '<a href="mailto:' + data.email + '" title="' + Q(data.email) + '" class="mailtolink" data-cutype="' + data.cutype + '">' + dispname + '</a>';
 
         // delete icon
         var icon = rcmail.env.deleteicon ? '<img src="' + rcmail.env.deleteicon + '" alt="" />' : rcmail.gettext('delete');
         var dellink = '<a href="#delete" class="iconlink delete deletelink" title="' + Q(rcmail.gettext('delete')) + '">' + icon + '</a>';
         var tooltip, status = (data.status || '').toLowerCase(),
             status_label = rcmail.gettext('status' + status, 'libcalendaring');
 
         // send invitation checkbox
         var invbox = '<input type="checkbox" class="edit-attendee-reply" value="' + Q(data.email) +'" title="' + Q(rcmail.gettext('tasklist.sendinvitations')) + '" '
             + (!data.noreply && settings.itip_notify & 1 ? 'checked="checked" ' : '') + '/>';
 
         if (data['delegated-to'])
-            tooltip = rcmail.gettext('delegatedto', 'tasklist') + data['delegated-to'];
+            tooltip = rcmail.gettext('libcalendaring.delegatedto') + ' ' + data['delegated-to'];
         else if (data['delegated-from'])
-            tooltip = rcmail.gettext('delegatedfrom', 'tasklist') + data['delegated-from'];
+            tooltip = rcmail.gettext('libcalendaring.delegatedfrom') + ' ' + data['delegated-from'];
         else if (status)
             tooltip = status_label;
 
         // add expand button for groups
         if (data.cutype == 'GROUP') {
             dispname += ' <a href="#expand" data-email="' + Q(data.email) + '" class="iconbutton add expandlink" title="' + rcmail.gettext('expandattendeegroup','libcalendaring') + '">' +
                 rcmail.gettext('expandattendeegroup','libcalendaring') + '</a>';
         }
 
         var html = '<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
             '<td class="confirmstate"><span class="' + status + '" title="' + Q(tooltip) + '">' + Q(status ? status_label : '') + '</span></td>' +
             (data.cutype != 'RESOURCE' ? '<td class="invite">' + (readonly || !invbox ? '' : invbox) + '</td>' : '') +
             '<td class="options">' + (readonly ? '' : dellink) + '</td>';
 
         var tr = $('<tr>')
             .addClass(String(data.role).toLowerCase())
             .html(html);
 
         if (before)
             tr.insertBefore(before)
         else
             tr.appendTo(attendees_list);
 
         tr.find('a.deletelink').click({ id:(data.email || data.name) }, function(e) { remove_attendee(this, e.data.id); return false; });
         tr.find('a.mailtolink').click(task_attendee_click);
         tr.find('a.expandlink').click(data, function(e) { me.expand_attendee_group(e, add_attendee, remove_attendee); return false; });
         tr.find('input.edit-attendee-reply').click(function() {
             var enabled = $('#edit-attendees-invite:checked').length || $('input.edit-attendee-reply:checked').length;
             $('#taskeditform .attendees-commentbox')[enabled ? 'show' : 'hide']();
         });
 
         task_attendees.push(data);
         return true;
     };
 
     // event handler for clicks on an attendee link
     var task_attendee_click = function(e)
     {
         var mailto = this.href.substr(7);
         rcmail.command('compose', mailto);
 
         return false;
     };
 
     // remove an attendee from the list
     var remove_attendee = function(elem, id)
     {
       $(elem).closest('tr').remove();
       task_attendees = $.grep(task_attendees, function(data) { return (data.name != id && data.email != id) });
     };
 
     /**
      * Show task details in a dialog
      */
     function task_show_dialog(id, data, temp)
     {
         var $dialog = $('#taskshow'), rec, list;
 
         if ($dialog.is(':ui-dialog'))
           $dialog.dialog('close');
 
         // remove status-* classes
         $dialog.removeClass(function(i, oldclass) {
             var oldies = String(oldclass).split(' ');
             return $.grep(oldies, function(cls) { return cls.indexOf('status-') === 0 }).join(' ');
         });
 
         if (!(rec = (data || listdata[id])) || (rcmail.menu_stack && rcmail.menu_stack.length > 0))
             return;
 
         me.selected_task = rec;
         list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] : {};
 
         // fill dialog data
         $('#task-parent-title').html(Q(rec.parent_title || '')+' &raquo;').css('display', rec.parent_title ? 'block' : 'none');
         $('#task-title').html(text2html(Q(rec.title || '')));
         $('#task-description').html(text2html(rec.description || '', 300, 6))[(rec.description ? 'show' : 'hide')]();
         $('#task-date')[(rec.date ? 'show' : 'hide')]().children('.task-text').html(Q(rec.date || rcmail.gettext('nodate','tasklist')));
         $('#task-time').html(Q(rec.time || ''));
         $('#task-start')[(rec.startdate ? 'show' : 'hide')]().children('.task-text').html(Q(rec.startdate || ''));
         $('#task-starttime').html(Q(rec.starttime || ''));
         $('#task-alarm')[(rec.alarms_text ? 'show' : 'hide')]().children('.task-text').html(Q(rec.alarms_text));
         $('#task-completeness .task-text').html(((rec.complete || 0) * 100) + '%');
         $('#task-status')[(rec.status ? 'show' : 'hide')]().children('.task-text').html(rcmail.gettext('status-'+String(rec.status).toLowerCase(),'tasklist'));
         $('#task-list .task-text').html(Q(me.tasklists[rec.list] ? me.tasklists[rec.list].name : ''));
         $('#task-attendees, #task-organizer, #task-created-changed, #task-rsvp, #task-rsvp-comment').hide();
 
         var itags = get_inherited_tags(rec);
         var taglist = $('#task-tags')[(rec.tags && rec.tags.length || itags.length ? 'show' : 'hide')]().children('.task-text').empty();
         if (rec.tags && rec.tags.length) {
             $.each(rec.tags, function(i,val){
                 $('<span>').addClass('tag-element').html(Q(val)).appendTo(taglist);
             });
         }
 
         // append inherited tags
         if (itags.length) {
             $.each(itags, function(i,val){
                 if (!rec.tags || $.inArray(val, rec.tags) < 0)
                     $('<span>').addClass('tag-element inherit').html(Q(val)).appendTo(taglist);
             });
             // re-sort tags list
             $(taglist).children().sortElements(function(a,b){
                 return $.text([a]).toLowerCase() > $.text([b]).toLowerCase() ? 1 : -1;
             });
         }
 
         if (rec.status) {
           $dialog.addClass('status-' + String(rec.status).toLowerCase());
         }
 
         if (rec.flagged) {
           $dialog.addClass('status-flagged');
         }
 
         if (rec.recurrence && rec.recurrence_text) {
             $('#task-recurrence').show().children('.task-text').html(Q(rec.recurrence_text));
         }
         else {
             $('#task-recurrence').hide();
         }
 
         if (rec.created || rec.changed) {
             $('#task-created-changed .task-created').html(Q(rec.created_ || rcmail.gettext('unknown','tasklist')))
             $('#task-created-changed .task-changed').html(Q(rec.changed_ || rcmail.gettext('unknown','tasklist')))
             $('#task-created-changed').show()
         }
 
         // build attachments list
         $('#task-attachments').hide();
         if ($.isArray(rec.attachments)) {
             task_show_attachments(rec.attachments || [], $('#task-attachments').children('.task-text'), rec);
             if (rec.attachments.length > 0) {
                 $('#task-attachments').show();
             }
         }
 
         // build attachments list
         $('#task-links').hide();
         if ($.isArray(rec.links) && rec.links.length) {
             render_message_links(rec.links || [], $('#task-links').children('.task-text'), false, 'tasklist');
             $('#task-links').show();
         }
 
         // list task attendees
         if (list.attendees && rec.attendees) {
 /*
             // sort resources to the end
             rec.attendees.sort(function(a,b) {
                 var j = a.cutype == 'RESOURCE' ? 1 : 0,
                     k = b.cutype == 'RESOURCE' ? 1 : 0;
                 return (j - k);
             });
 */
             var j, data, rsvp = false, mystatus = null, line, morelink, html = '', overflow = '',
                 organizer = is_organizer(rec);
 
             for (j=0; j < rec.attendees.length; j++) {
                 data = rec.attendees[j];
 
                 if (data.email && settings.identity.emails.indexOf(';'+data.email) >= 0) {
                     mystatus = data.status.toLowerCase();
                     if (data.status == 'NEEDS-ACTION' || data.status == 'TENTATIVE' || data.rsvp)
                         rsvp = mystatus;
                 }
 
                 line = rcube_libcalendaring.attendee_html(data);
 
                 if (morelink)
                     overflow += line;
                 else
                     html += line;
 
                 // stop listing attendees
                 if (j == 7 && rec.attendees.length >= 7) {
                     morelink = $('<a href="#more" class="morelink"></a>').html(rcmail.gettext('andnmore', 'tasklist').replace('$nr', rec.attendees.length - j - 1));
                 }
             }
 
             if (html) {
                 $('#task-attendees').show()
                     .children('.task-text')
                     .html(html)
                     .find('a.mailtolink').click(task_attendee_click);
 
                 // display all attendees in a popup when clicking the "more" link
                 if (morelink) {
                     $('#task-attendees .task-text').append(morelink);
                     morelink.click(function(e) {
                         rcmail.show_popup_dialog(
                             '<div id="all-task-attendees" class="task-attendees">' + html + overflow + '</div>',
                             rcmail.gettext('tabattendees', 'tasklist'),
                             null,
                             {width: 450, modal: false}
                         );
                         $('#all-task-attendees a.mailtolink').click(task_attendee_click);
                         return false;
                     });
                 }
             }
 /*
             if (mystatus && !rsvp) {
                 $('#task-partstat').show().children('.changersvp')
                     .removeClass('accepted tentative declined delegated needs-action')
                     .addClass(mystatus)
                     .children('.task-text')
                     .html(rcmail.gettext('status' + mystatus, 'libcalendaring'));
             }
 */
             var show_rsvp = !temp && rsvp && list.editable && !is_organizer(rec) && rec.status != 'CANCELLED';
             $('#task-rsvp')[(show_rsvp ? 'show' : 'hide')]();
             $('#task-rsvp .rsvp-buttons input').prop('disabled', false).filter('input[rel='+mystatus+']').prop('disabled', true);
 
             if (show_rsvp && rec.comment) {
                 $('#task-rsvp-comment').show().children('.task-text').html(Q(rec.comment));
             }
             $('#task-rsvp a.reply-comment-toggle').show();
             $('#task-rsvp .itip-reply-comment textarea').hide().val('');
 
             if (rec.organizer && !organizer) {
                 $('#task-organizer').show().children('.task-text').html(rcube_libcalendaring.attendee_html($.extend(rec.organizer, { role:'ORGANIZER' })));
             }
         }
 
         // define dialog buttons
         var buttons = [];
         if (list.editable && !rec.readonly) {
               buttons.push({
                 text: rcmail.gettext('edit','tasklist'),
                 click: function() {
                     task_edit_dialog(me.selected_task.id, 'edit');
                 },
                 disabled: rcmail.busy
             });
         }
 
         if (has_permission(list, 'td') && !rec.readonly) {
             buttons.push({
                 text: rcmail.gettext('delete','tasklist'),
                 'class': 'delete',
                 click: function() {
                     if (delete_task(me.selected_task.id))
                         $dialog.dialog('close');
                 },
                 disabled: rcmail.busy
             });
         }
 
         // open jquery UI dialog
         $dialog.dialog({
           modal: false,
           resizable: true,
           closeOnEscape: true,
           title: rcmail.gettext('taskdetails', 'tasklist'),
           open: function() {
               $dialog.parent().find('.ui-button:not(.ui-dialog-titlebar-close)').first().focus();
           },
           close: function() {
               $dialog.dialog('destroy').appendTo(document.body);
               $('.libcal-rsvp-replymode').hide();
           },
           dragStart: function() {
               $('.libcal-rsvp-replymode').hide();
           },
           resizeStart: function() {
               $('.libcal-rsvp-replymode').hide();
           },
           buttons: buttons,
           minWidth: 500,
           width: 580
         }).show();
 
         // set dialog size according to content
         me.dialog_resize($dialog.get(0), $dialog.height(), 580);
     }
 
     /**
      *
      */
     function task_history_dialog()
     {
         var dialog, rec = me.selected_task;
         if (!rec || !rec.id || !window.libkolab_audittrail) {
             return false;
         }
 
         // render dialog
         $dialog = libkolab_audittrail.object_history_dialog({
             module: 'tasklist',
             container: '#taskhistory',
             title: rcmail.gettext('objectchangelog','tasklist') + ' - ' + rec.title,
 
             // callback function for list actions
             listfunc: function(action, rev) {
                 var rec = $dialog.data('rec');
                 saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
                 rcmail.http_post('task', { action: action, t: { id: rec.id, list:rec.list, rev: rev } }, saving_lock);
             },
 
             // callback function for comparing two object revisions
             comparefunc: function(rev1, rev2) {
                 var rec = $dialog.data('rec');
                 saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
                 rcmail.http_post('task', { action:'diff', t: { id: rec.id, list: rec.list, rev1: rev1, rev2: rev2 } }, saving_lock);
             }
         });
 
         $dialog.data('rec', rec);
 
         // fetch changelog data
         saving_lock = rcmail.set_busy(true, 'loading', saving_lock);
         rcmail.http_post('task', { action: 'changelog', t: { id: rec.id, list: rec.list } }, saving_lock);
     }
 
     /**
      *
      */
     function task_render_changelog(data)
     {
         var $dialog = $('#taskhistory'),
             rec = $dialog.data('rec');
 
         if (data === false || !data.length || !rec) {
           // display 'unavailable' message
           $('<div class="notfound-message task-dialog-message warning">' + rcmail.gettext('objectchangelognotavailable','tasklist') + '</div>')
             .insertBefore($dialog.find('.changelog-table').hide());
           return;
         }
 
         data.module = 'tasklist';
         libkolab_audittrail.render_changelog(data, rec, me.tasklists[rec.list]);
 
         // set dialog size according to content
         me.dialog_resize($dialog.get(0), $dialog.height(), 600);
     }
 
     /**
      *
      */
     function task_show_diff(data)
     {
         var rec = me.selected_task,
             $dialog = $("#taskdiff");
 
         $dialog.find('div.form-section, h2.task-title-new').hide().data('set', false).find('.index').html('');
         $dialog.find('div.form-section.clone').remove();
 
         // always show event title and date
         $('.task-title', $dialog).text(rec.title).removeClass('task-text-old').show();
 
         // show each property change
         $.each(data.changes, function(i, change) {
             var prop = change.property, r2, html = false,
                 row = $('div.task-' + prop, $dialog).first();
 
                 // special case: title
                 if (prop == 'title') {
                     $('.task-title', $dialog).addClass('task-text-old').text(change['old'] || '--');
                     $('.task-title-new', $dialog).text(change['new'] || '--').show();
                 }
 
               // no display container for this property
               if (!row.length) {
                   return true;
               }
 
               // clone row if already exists
               if (row.data('set')) {
                   r2 = row.clone().addClass('clone').insertAfter(row);
                   row = r2;
               }
 
               // render description text
               if (prop == 'description') {
                   if (!change.diff_ && change['old']) change.old_ = text2html(change['old']);
                   if (!change.diff_ && change['new']) change.new_ = text2html(change['new']);
                   html = true;
               }
               // format attendees struct
               else if (prop == 'attendees') {
                   if (change['old']) change.old_ = rcube_libcalendaring.attendee_html(change['old']);
                   if (change['new']) change.new_ = rcube_libcalendaring.attendee_html($.extend({}, change['old'] || {}, change['new']));
                   html = true;
               }
               // localize status
               else if (prop == 'status') {
                   if (change['old']) change.old_ = rcmail.gettext('status-'+String(change['old']).toLowerCase(), 'tasklist');
                   if (change['new']) change.new_ = rcmail.gettext('status-'+String(change['new']).toLowerCase(), 'tasklist');
               }
 
               // format attachments struct
               if (prop == 'attachments') {
                   if (change['old']) task_show_attachments([change['old']], row.children('.task-text-old'), rec, false);
                   else               row.children('.task-text-old').text('--');
                   if (change['new']) task_show_attachments([$.extend({}, change['old'] || {}, change['new'])], row.children('.task-text-new'), rec, false);
                   else               row.children('.task-text-new').text('--');
                   // remove click handler in diff view
                   $('.attachmentslist li a', row).unbind('click').removeAttr('href');
               }
               else if (change.diff_) {
                   row.children('.task-text-diff').html(change.diff_);
                   row.children('.task-text-old, .task-text-new').hide();
               }
               else {
                   if (!html) {
                     // escape HTML characters
                     change.old_ = Q(change.old_ || change['old'] || '--')
                     change.new_ = Q(change.new_ || change['new'] || '--')
                   }
                   row.children('.task-text-old').html(change.old_ || change['old'] || '--').show();
                   row.children('.task-text-new').html(change.new_ || change['new'] || '--').show();
               }
 
               // display index number
               if (typeof change.index != 'undefined') {
                   row.find('.index').html('(' + change.index + ')');
               }
 
               row.show().data('set', true);
         });
 
         // open jquery UI dialog
         $dialog.dialog({
             modal: false,
             resizable: true,
             closeOnEscape: true,
             title: rcmail.gettext('objectdiff','tasklist').replace('$rev1', data.rev1).replace('$rev2', data.rev2) + ' - ' + rec.title,
             open: function() {
                 $dialog.attr('aria-hidden', 'false');
             },
             close: function() {
                 $dialog.dialog('destroy').attr('aria-hidden', 'true').hide();
             },
             buttons: [
                 {
                     text: rcmail.gettext('close'),
                     click: function() { $dialog.dialog('close'); },
                     autofocus: true
                 }
             ],
             minWidth: 320,
             width: 450
         }).show();
 
         // set dialog size according to content
         me.dialog_resize($dialog.get(0), $dialog.height(), 400);
     }
 
     // close the event history dialog
     function close_history_dialog()
     {
         $('#taskhistory, #taskdiff').each(function(i, elem) {
         var $dialog = $(elem);
         if ($dialog.is(':ui-dialog'))
             $dialog.dialog('close');
         });
     };
 
     /**
      * Opens the dialog to edit a task
      */
     function task_edit_dialog(id, action, presets)
     {
         $('#taskshow:ui-dialog').dialog('close');
 
         var selected_list, rec = listdata[id] || presets,
             $dialog = $('<div>'),
             editform = $('#taskedit'),
             list = rec.list && me.tasklists[rec.list] ? me.tasklists[rec.list] :
                 (me.selected_list ? me.tasklists[me.selected_list] : { editable: action == 'new', rights: action == 'new' ? 'rwitd' : 'r' });
 
         if (rcmail.busy || !has_permission(list, 'i') || (action == 'edit' && (!rec || rec.readonly)))
             return false;
 
         me.selected_task = $.extend({ valarms:[] }, rec);  // clone task object
         rec = me.selected_task;
 
         // assign temporary id
         if (!me.selected_task.id)
             me.selected_task.id = -(++idcount);
 
         // reset dialog first
         $('#taskeditform').get(0).reset();
 
         // allow other plugins to do actions when task form is opened
         rcmail.triggerEvent('tasklist-task-init', {o: rec});
 
         // fill form data
         var title = $('#taskedit-title').val(rec.title || '');
         var description = $('#taskedit-description').val(rec.description || '');
         var recdate = $('#taskedit-date').val(rec.date || '');
         var rectime = $('#taskedit-time').val(rec.time || '');
         var recstartdate = $('#taskedit-startdate').val(rec.startdate || '');
         var recstarttime = $('#taskedit-starttime').val(rec.starttime || '');
         var complete = $('#taskedit-completeness').val((rec.complete || 0) * 100);
         completeness_slider.slider('value', complete.val());
         var taskstatus = $('#taskedit-status').val(rec.status || '');
         var tasklist = $('#taskedit-tasklist').prop('disabled', rec.parent_id ? true : false);
         var notify = $('#edit-attendees-donotify').get(0);
         var invite = $('#edit-attendees-invite').get(0);
         var comment = $('#edit-attendees-comment');
 
         invite.checked = settings.itip_notify & 1 > 0;
         notify.checked = has_attendees(rec) && invite.checked;
 
         // set tasklist selection according to permissions
         tasklist.find('option').each(function(i, opt) {
             var l = me.tasklists[opt.value] || {},
                 writable = l.editable || (action == 'new' && has_permission(l, 'i'));
             $(opt).prop('disabled', !writable);
 
             if (!selected_list && writable)
                 selected_list = opt.value;
         });
 
         tasklist.val(rec.list || me.selected_list || selected_list);
 
         // tag-edit line
         var tagline = $(rcmail.gui_objects.edittagline).empty();
         $.each(typeof rec.tags == 'object' && rec.tags.length ? rec.tags : [''], function(i,val){
             $('<input>')
                 .attr('name', 'tags[]')
                 .attr('tabindex', '0')
                 .addClass('tag')
                 .val(val)
                 .appendTo(tagline);
         });
 
         $('input.tag', rcmail.gui_objects.edittagline).tagedit({
             animSpeed: 100,
             allowEdit: false,
             checkNewEntriesCaseSensitive: false,
             autocompleteOptions: { source: tags, minLength: 0, noCheck: true, appendTo:'#taskedit' },
             texts: { removeLinkTitle: rcmail.gettext('removetag', 'tasklist') }
         });
 
         // set alarm(s)
         me.set_alarms_edit('#taskedit-alarms', action != 'new' && rec.valarms ? rec.valarms : []);
 
         if ($.isArray(rec.links) && rec.links.length) {
             render_message_links(rec.links, $('#taskedit-links .task-text'), true, 'tasklist');
             $('#taskedit-links').show();
         }
         else {
             $('#taskedit-links').hide();
         }
 
         // set recurrence
         me.set_recurrence_edit(rec);
 
         // init attendees tab
         var organizer = !rec.attendees || is_organizer(rec),
             allow_invitations = organizer || (rec.owner && rec.owner == 'anonymous') || settings.invite_shared;
 
         task_attendees = [];
         attendees_list = $('#edit-attendees-table > tbody').html('');
         $('#edit-attendees-notify')[(allow_invitations && has_attendees(rec) && (settings.itip_notify & 2) ? 'show' : 'hide')]();
         $('#edit-localchanges-warning')[(has_attendees(rec) && !(allow_invitations || (rec.owner && is_organizer(rec, rec.owner))) ? 'show' : 'hide')]();
 
         // attendees (aka assignees)
         if (list.attendees) {
             var j, data, reply_selected = 0;
             if (rec.attendees) {
                 for (j=0; j < rec.attendees.length; j++) {
                     data = rec.attendees[j];
                     add_attendee(data, !allow_invitations);
                     if (allow_invitations && !data.noreply) {
                         reply_selected++;
                     }
                 }
             }
 
             // make sure comment box is visible if at least one attendee has reply enabled
             // or global "send invitations" checkbox is checked
             $('#taskeditform .attendees-commentbox')[(reply_selected || invite.checked ? 'show' : 'hide')]();
 
             // select the correct organizer identity
             var identity_id = 0;
             $.each(settings.identities, function(i,v) {
                 if (!rec.organizer || v == rec.organizer.email) {
                     identity_id = i;
                     return false;
                 }
             });
 
             $('#edit-tab-attendees').show();
             $('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
             $('#edit-identities-list').val(identity_id);
             $('#taskedit-organizer')[(organizer ? 'show' : 'hide')]();
         }
         else {
             $('#edit-tab-attendees').hide();
         }
 
         // attachments
         rcmail.enable_command('remove-attachment', list.editable);
         me.selected_task.deleted_attachments = [];
         // we're sharing some code for uploads handling with app.js
         rcmail.env.attachments = [];
         rcmail.env.compose_id = me.selected_task.id; // for rcmail.async_upload_form()
 
         if ($.isArray(rec.attachments)) {
             task_show_attachments(rec.attachments, $('#taskedit-attachments'), rec, true);
         }
         else {
             $('#taskedit-attachments > ul').empty();
         }
 
         // show/hide tabs according to calendar's feature support
         $('#taskedit-tab-attachments')[(list.attachments||rec.attachments?'show':'hide')]();
 
         // activate the first tab
         $('#taskedit').tabs('option', 'active', 0);
 
         // define dialog buttons
         var buttons = [];
         buttons.push({
             text: rcmail.gettext('save', 'tasklist'),
             'class': 'mainaction',
             click: function() {
             var data = me.selected_task;
             data._status_before = me.selected_task.status + '';
 
             // copy form field contents into task object to save
             $.each({ title:title, description:description, date:recdate, time:rectime, startdate:recstartdate, starttime:recstarttime, status:taskstatus }, function(key,input){
                 data[key] = input.val();
             });
             data.list = tasklist.find('option:selected').val();
             data.tags = [];
             data.attachments = [];
             data.attendees = task_attendees;
             data.valarms = me.serialize_alarms('#taskedit-alarms');
             data.recurrence = me.serialize_recurrence(rectime.val());
 
             // do some basic input validation
             if (!data.title || !data.title.length) {
                 title.focus();
                 return false;
             }
             else if (data.startdate && data.date) {
                 var startdate = $.datepicker.parseDate(datepicker_settings.dateFormat, data.startdate, datepicker_settings);
                 var duedate = $.datepicker.parseDate(datepicker_settings.dateFormat, data.date, datepicker_settings);
                 if (startdate > duedate) {
                     alert(rcmail.gettext('invalidstartduedates', 'tasklist'));
                     return false;
                 }
                 else if ((data.time == '') != (data.starttime == '')) {
                     alert(rcmail.gettext('invalidstartduetimes', 'tasklist'));
                     return false;
                 }
             }
             else if (data.recurrence && !data.startdate && !data.date) {
                 alert(rcmail.gettext('recurrencerequiresdate', 'tasklist'));
                 return false;
             }
 
             // collect tags
             $('input[type="hidden"]', rcmail.gui_objects.edittagline).each(function(i,elem) {
                 if (elem.value)
                     data.tags.push(elem.value);
             });
             // including the "pending" one in the text box
             var newtag = $('#tagedit-input').val();
             if (newtag != '') {
                 data.tags.push(newtag);
             }
 
             // uploaded attachments list
             for (var i in rcmail.env.attachments) {
                 if (i.match(/^rcmfile(.+)/))
                     data.attachments.push(RegExp.$1);
             }
 
             // task assigned to a new list
             if (data.list && listdata[id] && data.list != listdata[id].list) {
                 data._fromlist = list.id;
             }
 
             data.complete = complete.val() / 100;
             if (isNaN(data.complete))
                 data.complete = null;
             else if (data.complete == 1.0 && rec.status === '')
                 data.status = 'COMPLETED';
 
             if (!data.list && list.id)
                 data.list = list.id;
 
             if (!data.tags.length)
                 data.tags = '';
 
             if (organizer) {
                 data._identity = $('#edit-identities-list option:selected').val();
                 delete data.organizer;
             }
 
             // per-attendee notification suppression
             var need_invitation = false;
             if (allow_invitations) {
                 $.each(data.attendees, function (i, v) {
                     if (v.role != 'ORGANIZER') {
                         if ($('input.edit-attendee-reply[value="' + v.email + '"]').prop('checked')) {
                             need_invitation = true;
                             delete data.attendees[i]['noreply'];
                         }
                         else if (settings.itip_notify > 0) {
                             data.attendees[i].noreply = 1;
                         }
                     }
                 });
             }
 
             // tell server to send notifications
             if ((has_attendees(data) || (rec.id && has_attendees(rec))) && allow_invitations && (notify.checked || invite.checked || need_invitation)) {
                 data._notify = settings.itip_notify;
                 data._comment = comment.val();
             }
             else if (data._notify) {
                 delete data._notify;
             }
 
             if (save_task(data, action))
                 $dialog.dialog('close');
         }  // end click:
         });
 
         if (action != 'new') {
             buttons.push({
                 text: rcmail.gettext('delete', 'tasklist'),
                 'class': 'delete',
                 click: function() {
                     if (delete_task(rec.id))
                         $dialog.dialog('close');
                 }
             });
         }
 
         buttons.push({
             text: rcmail.gettext('cancel', 'tasklist'),
             click: function() {
                 $dialog.dialog('close');
             }
         });
 
         // open jquery UI dialog
         $dialog.dialog({
           modal: true,
           resizable: (!bw.ie6 && !bw.ie7),  // disable for performance reasons
           closeOnEscape: false,
           title: rcmail.gettext((action == 'edit' ? 'edittask' : 'newtask'), 'tasklist'),
           close: function() {
               rcmail.ksearch_blur();
               editform.hide().appendTo(document.body);
               $dialog.dialog('destroy').remove();
           },
           buttons: buttons,
           minHeight: 460,
           minWidth: 500,
           width: 580
         }).append(editform.show());  // adding form content AFTERWARDS massively speeds up opening on IE
 
         title.select();
 
         // set dialog size according to content
         me.dialog_resize($dialog.get(0), $dialog.height(), 580);
     }
 
     /**
      * Open a task attachment either in a browser window for inline view or download it
      */
     function load_attachment(rec, att)
     {
         // can't open temp attachments
         if (!rec.id || rec.id < 0)
             return false;
 
         var query = { _id: att.id, _t: rec.recurrence_id||rec.id, _list:rec.list, _frame: 1 };
         if (rec.rev)
             query._rev = rec.rev;
 
 
         // open attachment in frame if it's of a supported mimetype
         // similar as in app.js and calendar_ui.js
         if (att.id && att.mimetype && $.inArray(att.mimetype, settings.mimetypes)>=0) {
             if (rcmail.open_window(rcmail.url('get-attachment', query), true, true)) {
                 return;
             }
         }
 
         query._frame = null;
         query._download = 1;
         rcmail.goto_url('get-attachment', query, false);
     };
 
     /**
      * Build task attachments list
      */
     function task_show_attachments(list, container, rec, edit)
     {
         var i, id, len, content, li, elem,
             ul = $('<ul>').addClass('attachmentslist');
 
         for (i=0, len=list.length; i<len; i++) {
             elem = list[i];
             li = $('<li>').addClass(elem.classname);
 
             if (edit) {
                 rcmail.env.attachments[elem.id] = elem;
                 // delete icon
                 content = $('<a>')
                     .attr('href', '#delete')
                     .attr('title', rcmail.gettext('delete'))
                     .addClass('delete')
                     .click({ id:elem.id }, function(e) {
                         remove_attachment(this, e.data.id);
                         return false;
                     });
 
                 if (!rcmail.env.deleteicon) {
                     content.html(rcmail.gettext('delete'));
                 }
                 else {
                     $('<img>').attr('src', rcmail.env.deleteicon).attr('alt', rcmail.gettext('delete')).appendTo(content);
                 }
 
                 li.append(content);
             }
 
             // name/link
             $('<a>')
                 .attr('href', '#load')
                 .addClass('file')
                 .html(elem.name).click({ task:rec, att:elem }, function(e) {
                     load_attachment(e.data.task, e.data.att);
                     return false;
                 }).appendTo(li);
 
             ul.append(li);
         }
 
         if (edit && rcmail.gui_objects.attachmentlist) {
             ul.id = rcmail.gui_objects.attachmentlist.id;
             rcmail.gui_objects.attachmentlist = ul.get(0);
         }
 
         container.empty().append(ul);
     };
 
     /**
      *
      */
     function remove_attachment(elem, id)
     {
         $(elem.parentNode).hide();
         me.selected_task.deleted_attachments.push(id);
         delete rcmail.env.attachments[id];
     }
 
     /**
      *
      */
     function remove_link(elem)
     {
         var $elem = $(elem), uri = $elem.attr('data-uri');
 
         // remove the link item matching the given uri
         me.selected_task.links = $.grep(me.selected_task.links, function(link) { return link.uri != uri; });
 
         // remove UI list item
         $elem.hide().closest('li').addClass('deleted');
     }
 
     /**
      *
      */
     function add_childtask(id)
     {
         if (rcmail.busy)
             return false;
 
         var rec = listdata[id];
         task_edit_dialog(null, 'new', { parent_id:id, list:rec.list });
     }
 
     /**
      * Delete the given task
      */
     function delete_task(id)
     {
         var rec = listdata[id];
         if (!rec || rec.readonly || rcmail.busy)
             return false;
 
         var html, buttons = [], $dialog = $('<div>');
 
         // Subfunction to submit the delete command after confirm
         var _delete_task = function(id, mode) {
             var rec = listdata[id],
                 li = $('li[rel="'+id+'"]', rcmail.gui_objects.resultlist).hide(),
                 decline = $dialog.find('input.confirm-attendees-decline:checked').length,
                 notify = $dialog.find('input.confirm-attendees-notify:checked').length;
 
             saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
             rcmail.http_post('task', { action:'delete', t:{ id:rec.id, list:rec.list, _decline:decline, _notify:notify }, mode:mode, filter:filtermask });
 
             // move childs to parent/root
             if (mode != 1 && rec.children !== undefined) {
                 var parent_node = rec.parent_id ? $('li[rel="'+rec.parent_id+'"] > .childtasks', rcmail.gui_objects.resultlist) : null;
                 if (!parent_node || !parent_node.length)
                     parent_node = rcmail.gui_objects.resultlist;
 
                 $.each(rec.children, function(i,cid) {
                     var child = listdata[cid];
                     child.parent_id = rec.parent_id;
                     resort_task(child, $('li[rel="'+cid+'"]').appendTo(parent_node), true);
                 });
             }
 
             li.remove();
             delete listdata[id];
         }
 
         if (rec.children && rec.children.length) {
             html = rcmail.gettext('deleteparenttasktconfirm','tasklist');
             buttons.push({
                 text: rcmail.gettext('deletethisonly','tasklist'),
                 click: function() {
                     _delete_task(id, 0);
                     $(this).dialog('close');
                 }
             });
             buttons.push({
                 text: rcmail.gettext('deletewithchilds','tasklist'),
                 click: function() {
                     _delete_task(id, 1);
                     $(this).dialog('close');
                 }
             });
         }
         else {
             html = rcmail.gettext('deletetasktconfirm','tasklist');
             buttons.push({
                 text: rcmail.gettext('delete','tasklist'),
                 'class': 'delete',
                 click: function() {
                     _delete_task(id, 0);
                     $(this).dialog('close');
                 }
             });
         }
 
         if (is_attendee(rec)) {
             html += '<div class="task-dialog-message">' +
                 '<label><input class="confirm-attendees-decline" type="checkbox" checked="checked" value="1" name="_decline" />&nbsp;' +
                     rcmail.gettext('itipdeclinetask', 'tasklist') + 
                 '</label></div>';
         }
         else if (has_attendees(rec) && is_organizer(rec)) {
             html += '<div class="task-dialog-message">' +
                 '<label><input class="confirm-attendees-notify" type="checkbox" checked="checked" value="1" name="_notify" />&nbsp;' +
                     rcmail.gettext('sendcancellation', 'tasklist') + 
                 '</label></div>';
         }
 
         buttons.push({
             text: rcmail.gettext('cancel', 'tasklist'),
             click: function() {
                 $(this).dialog('close');
             }
         });
 
         $dialog.html(html);
         $dialog.dialog({
           modal: true,
           width: 520,
           dialogClass: 'warning no-close',
           title: rcmail.gettext('deletetask', 'tasklist'),
           buttons: buttons,
           close: function(){
               $dialog.dialog('destroy').hide();
           }
         }).addClass('tasklist-confirm').show();
 
         return true;
     }
 
     /**
      * Check if the given task matches the current filtermask and tag selection
      */
     function match_filter(rec, cache, recursive)
     {
         // return cached result
         if (typeof cache[rec.id] != 'undefined' && recursive != 2) {
             return cache[rec.id];
         }
 
         var match = !filtermask || (filtermask & rec.mask) == filtermask;
 
         // in focusview mode, only tasks from the selected list are allowed
         if (focusview)
             match = $.inArray(rec.list, focusview_lists) >= 0 && match;
 
         if (match && tagsfilter.length) {
             match = rec.tags && rec.tags.length;
             var alltags = get_inherited_tags(rec).concat(rec.tags || []);
             for (var i=0; match && i < tagsfilter.length; i++) {
                 if ($.inArray(tagsfilter[i], alltags) < 0)
                     match = false;
             }
         }
 
         // check if a child task matches the tags
         if (!match && (recursive||0) < 2 && rec.children && rec.children.length) {
             for (var j=0; !match && j < rec.children.length; j++) {
                 match = match_filter(listdata[rec.children[j]], cache, 1);
             }
         }
 
         // walk up the task tree and check if a parent task matches
         var parent_id;
         if (!match && !recursive && (parent_id = rec.parent_id)) {
             while (!match && parent_id && listdata[parent_id]) {
                 match = match_filter(listdata[parent_id], cache, 2);
                 parent_id = listdata[parent_id].parent_id;
             }
         }
 
         if (recursive != 1) {
             cache[rec.id] = match;
         }
         return match;
     }
 
     /**
      *
      */
     function get_inherited_tags(rec)
     {
         var parent_id, itags = [];
 
         if ((parent_id = rec.parent_id)) {
             while (parent_id && listdata[parent_id]) {
                 itags = itags.concat(listdata[parent_id].tags || []);
                 parent_id = listdata[parent_id].parent_id;
             }
         }
 
         return $.uniqueStrings(itags);
     }
 
     /**
      * Change tasks list sorting
      */
     function list_set_sort(col)
     {
         if (settings.sort_col != col) {
           settings.sort_col = col;
           $('#taskviewsortmenu .sortcol').attr('aria-checked', 'false').removeClass('selected')
               .filter('.by-' + col).attr('aria-checked', 'true').addClass('selected');
 
           // re-sort list index and re-render list
           listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });
           render_tasklist();
 
           rcmail.enable_command('list-order', settings.sort_col != 'auto');
           $('#taskviewsortmenu .sortorder').removeClass('selected').filter('[aria-checked=true]').addClass('selected');
 
           rcmail.save_pref({ name: 'tasklist_sort_col', value: (col == 'auto' ? '' : col) });
         }
     }
 
     /**
      * Change tasks list sort order
      */
     function list_set_order(order)
     {
         if (settings.sort_order != order) {
           settings.sort_order = order;
           $('#taskviewsortmenu .sortorder').attr('aria-checked', 'false').removeClass('selected')
               .filter('.' + order).attr('aria-checked', 'true').addClass('selected');
 
           // re-sort list index and re-render list
           listindex.sort(function(a, b) { return task_cmp(listdata[a], listdata[b]); });
           render_tasklist();
 
           rcmail.save_pref({ name: 'tasklist_sort_order', value: order });
         }
     }
 
     /**
      *
      */
     function list_edit_dialog(id)
     {
         var list = me.tasklists[id],
             $dialog = $(rcmail.gui_containers.tasklistform);
 
         if ($dialog.is(':ui-dialog'))
             $dialog.dialog('close');
 
         if (!list)
             list = { name:'', editable:true, rights:'riwta', showalarms:true };
 
         var editform, name, alarms;
 
         $dialog.html(rcmail.get_label('loading'));
         $.ajax({
             type: 'GET',
             dataType: 'html',
             url: rcmail.url('tasklist'),
             data: { action:(list.id ? 'form-edit' : 'form-new'), l:{ id:list.id } },
             success: function(data) {
                 $dialog.html(data);
                 rcmail.triggerEvent('tasklist_editform_load', list);
 
                 // resize and reposition dialog window
                 editform = $('#tasklisteditform');
                 me.dialog_resize(rcmail.gui_containers.tasklistform, editform.height(), editform.width());
 
                 name = $('#taskedit-tasklistame').prop('disabled', !has_permission(list, 'a')||list.norename).val(list.editname || list.name);
                 alarms = $('#taskedit-showalarms').prop('checked', list.showalarms).get(0);
                 name.select();
 
                 // suppress form submission with <Enter>
                 editform.on('submit', function(e) {
                     e.preventDefault();
                     return false;
                 });
             }
         });
 
         // dialog buttons
         var buttons = [];
 
         buttons.push({
             text: rcmail.gettext('save','tasklist'),
             'class': 'mainaction',
             click: function() {
             // do some input validation
             if (!name.val() || name.val().length < 2) {
                 alert(rcmail.gettext('invalidlistproperties', 'tasklist'));
                 name.select();
                 return;
             }
 
             // post data to server
             var data = editform.serializeJSON();
             if (list.id)
                 data.id = list.id;
             if (alarms)
                 data.showalarms = alarms.checked ? 1 : 0;
 
             saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
             rcmail.http_post('tasklist', { action:(list.id ? 'edit' : 'new'), l:data });
             $dialog.dialog('close');
         }  // end click:
         });
 
         buttons.push({
             text: rcmail.gettext('cancel','tasklist'),
             click: function() {
                 $dialog.dialog('close');
             }
         });
 
         // open jquery UI dialog
         $dialog.dialog({
             modal: true,
             resizable: true,
             closeOnEscape: false,
             title: rcmail.gettext((list.id ? 'editlist' : 'createlist'), 'tasklist'),
             close: function() {
                 $dialog.dialog('destroy').hide();
             },
             buttons: buttons,
             minWidth: 400,
             width: 420
         }).show();
     }
 
     /**
      *
      */
     function list_delete(id)
     {
         var list = me.tasklists[id];
         if (list && !list.norename && confirm(rcmail.gettext(list.children ? 'deletelistconfirmrecursive' : 'deletelistconfirm', 'tasklist'))) {
             saving_lock = rcmail.set_busy(true, 'tasklist.savingdata');
             rcmail.http_post('tasklist', { action:'delete', l:{ id:list.id } });
             return true;
         }
         return false;
     }
 
     /**
      *
      */
     function list_remove(id)
     {
         var list = me.tasklists[id];
         if (list && list.removable) {
             destroy_list(list);
             rcmail.http_post('tasklist', { action:'subscribe', l:{ id:list.id, active:0, permanent:0, recursive:1 } });
         }
     }
 
     /**
      * Callback from server to finally remove the given list
      */
     function destroy_list(prop)
     {
         var li, delete_ids = [],
             list = me.tasklists[prop.id];
 
         // find sub-lists
         if (list && list.children) {
             for (var child_id in me.tasklists) {
                 if (String(child_id).indexOf(prop.id) == 0)
                     delete_ids.push(child_id);
             }
         }
         else {
             delete_ids.push(prop.id);
         }
 
         // delete all subfolders in the list
         for (var i=0; i < delete_ids.length; i++) {
             id = delete_ids[i];
             list = me.tasklists[id];
             tasklists_widget.remove(id);
 
             if (list) {
                 list.active = false;
                 // delete me.tasklists[prop.id];
                 unlock_saving();
                 remove_tasks(list.id);
             }
             $("#taskedit-tasklist option[value='"+id+"']").remove();
         }
     }
 
     /**
      *
      */
     function insert_list(prop)
     {
         if (prop._reload) {
             rcmail.redirect(rcmail.url(''));
             return;
         }
 
         tasklists_widget.insert({
             id: prop.id,
             classes: [ prop.group || '' ],
             virtual: prop.virtual,
             html: prop.html
         }, prop.parent || null, prop.group);
 
         // flag as tasklist for drag & drop
         $(tasklists_widget.get_item(prop.id)).data('type', 'tasklist');
 
         delete prop.html;
         me.tasklists[prop.id] = prop;
 
         // append to list selector in task edit dialog, too (#2985)
         $('<option>').attr('value', prop.id).html(Q(prop.name)).appendTo('#taskedit-tasklist');
     }
 
     /**
      *
      */
     function update_list(prop)
     {
         var id = prop.oldid || prop.id,
             li = tasklists_widget.get_item(id);
 
         if (prop._reload) {
             rcmail.redirect(rcmail.url(''));
             return;
         }
 
         if (me.tasklists[id] && li) {
             delete me.tasklists[id];
             me.tasklists[prop.id] = prop;
             $(li).find('input').first().val(prop.id);
             $(li).find('.listname').first().html(Q(prop.name));
             tasklists_widget.update(id, { id:prop.id, html:li.children().first() });
         }
     }
 
     /**
      *
      */
     function list_showurl(id)
     {
         var list = me.tasklists[id];
         if (list && list.caldavurl) {
             $('div.showurldialog:ui-dialog').dialog('close');
 
             var $dialog = $('<div>').addClass('showurldialog').append('<p>'+rcmail.gettext('caldavurldescription', 'tasklist')+'</p>'),
                 textbox = $('<textarea>').addClass('urlbox').css('width', '100%').attr('rows', 2).appendTo($dialog);
 
             $dialog.dialog({
                 resizable: true,
                 closeOnEscape: true,
                 title: rcmail.gettext('showcaldavurl', 'tasklist'),
                 close: function() {
                   $dialog.dialog("destroy").remove();
                 },
                 width: 520
             }).show();
 
             textbox.val(list.caldavurl).select();
         }
     }
 
     /**
      * Execute search
      */
     function quicksearch()
     {
         var q;
         if (rcmail.gui_objects.qsearchbox && (q = rcmail.gui_objects.qsearchbox.value)) {
             var id = 'search-'+q;
             var resources = [];
 
             for (var rid in me.tasklists) {
                 if (me.tasklists[rid].active) {
                     resources.push(rid);
                 }
             }
             id += '@'+resources.join(',');
 
             // ignore if query didn't change
             if (search_request == id)
                 return;
 
             search_request = id;
             search_query = q;
 
             list_tasks();
         }
         else  // empty search input equals reset
             this.reset_search();
     }
 
     /**
      * Reset search and get back to normal listing
      */
     function reset_search()
     {
         $(rcmail.gui_objects.qsearchbox).val('');
 
         if (search_request) {
             search_request = search_query = null;
             list_tasks();
         }
     }
 
 
     // method to show the print dialog.
     function print_tasks()
     {
         var param = {}, active = active_lists();
 
         if (active.length) {
             param = {filter: filtermask, lists: active.join(','), q: search_query};
             rcmail.open_window(rcmail.url('print', param), true, true);
         }
     };
 
 
     /**** Utility functions ****/
 
     // same as str.split(delimiter) but it ignores delimiters within quoted strings
     var explode_quoted_string = function(str, delimiter)
     {
       var result = [],
         strlen = str.length,
         q, p, i, char, last;
 
       for (q = p = i = 0; i < strlen; i++) {
         char = str.charAt(i);
         if (char == '"' && last != '\\') {
           q = !q;
         }
         else if (!q && char == delimiter) {
           result.push(str.substring(p, i));
           p = i + 1;
         }
         last = char;
       }
 
       result.push(str.substr(p));
       return result;
     };
 
     /**
      * Clear any text selection
      * (text is probably selected when double-clicking somewhere)
      */
     function clearSelection()
     {
         if (document.selection && document.selection.empty) {
             document.selection.empty() ;
         }
         else if (window.getSelection) {
             var sel = window.getSelection();
             if (sel && sel.removeAllRanges)
                 sel.removeAllRanges();
         }
     }
 
     /**
      * Check whether the event target is a descentand of the given element
      */
     function target_overlaps(target, elem)
     {
         while (target.parentNode) {
             if (target.parentNode == elem)
                 return true;
             target = target.parentNode;
         }
         return false;
     }
 
     /**
      *
      */
     function active_lists()
     {
         var active = [];
         for (var id in me.tasklists) {
             if (me.tasklists[id].active)
                 active.push(id);
         }
         return active;
     }
 
     // resize and reposition (center) the dialog window
     this.dialog_resize = function(id, height, width)
     {
         var win = $(window), w = win.width(), h = win.height();
             $(id).dialog('option', { height: Math.min(h-20, height+130), width: Math.min(w-20, width+50) })
                 .dialog('option', 'position', ['center', 'center']);  // only works in a separate call (!?)
     };
 
     /**
      * Enable/disable focusview mode for the given list
      */
     function set_focusview(id, shift)
     {
         var in_focus = $.inArray(id, focusview_lists) >= 0,
             li = $(tasklists_widget.get_item(id)).find('.tasklist').first();
 
         // remove list from focusview
         if (in_focus && shift && id !== null) {
             focusview_lists = $.grep(focusview_lists, function(list_id) { return list_id != id; });
         }
         else {
             if (!shift || id === null) {
                 focusview_lists = [];
 
                 // uncheck all active focusview icons
                 tasklists_widget.container.find('div.focusview')
                     .removeClass('focusview')
                     .find('a.quickview').attr('aria-checked', 'false');
             }
 
             if (!in_focus && id !== null) {
                 focusview_lists.push(id)
             }
         }
 
         focusview = focusview_lists.length > 0;
 
         // activate list if necessary
         if (focusview && !me.tasklists[id].active) {
             li.find('input[type=checkbox]').get(0).checked = true;
             me.tasklists[id].active = true;
             fetch_counts();
         }
 
         // update list
         list_tasks(null);
 
         if (focusview) {
             li[in_focus ? 'removeClass' : 'addClass']('focusview')
                 .find('a.quickview').attr('aria-checked', in_focus ? 'false' : 'true');
             $('body').addClass('quickview-active');
         }
         else {
             $('body').removeClass('quickview-active');
         }
     }
 
 
     // init dialog by default
     init_taskedit();
 }
 
 
 // extend jQuery
 // from http://james.padolsey.com/javascript/sorting-elements-with-jquery/
 jQuery.fn.sortElements = (function(){
     var sort = [].sort;
 
     return function(comparator, getSortable) {
         getSortable = getSortable || function(){ return this };
 
         var last = null;
         return sort.call(this, comparator).each(function(i){
             // at this point the array is sorted, so we can just detach each one from wherever it is, and add it after the last
             var node = $(getSortable.call(this));
             var parent = node.parent();
             if (last) last.after(node);
             else      parent.prepend(node);
             last = node;
         });
     };
 })();
 
 // equivalent to $.unique() but working on arrays of strings
 jQuery.uniqueStrings = (function() {
     return function(arr) {
         var hash = {}, out = [];
 
         for (var i = 0; i < arr.length; i++) {
             hash[arr[i]] = 0;
         }
         for (var val in hash) {
             out.push(val);
         }
 
         return out;
     };
 })();
 
 
 /* tasklist plugin UI initialization */
 var rctasks;
 window.rcmail && rcmail.addEventListener('init', function(evt) {
 
   rctasks = new rcube_tasklist_ui($.extend(rcmail.env.tasklist_settings, rcmail.env.libcal_settings));
 
   // register button commands
   rcmail.register_command('newtask', function(){ rctasks.edit_task(null, 'new', {}); }, true);
   rcmail.register_command('print', function(){ rctasks.print_tasks(); }, true);
 
   rcmail.register_command('list-create', function(){ rctasks.list_edit_dialog(null); }, true);
   rcmail.register_command('list-edit', function(){ rctasks.list_edit_dialog(rctasks.selected_list); }, false);
   rcmail.register_command('list-delete', function(){ rctasks.list_delete(rctasks.selected_list); }, false);
   rcmail.register_command('list-remove', function(){ rctasks.list_remove(rctasks.selected_list); }, false);
   rcmail.register_command('list-showurl', function(){ rctasks.list_showurl(rctasks.selected_list); }, false);
 
   rcmail.register_command('export', function(){ rctasks.export_tasks(); }, true);
   rcmail.register_command('search', function(){ rctasks.quicksearch(); }, true);
   rcmail.register_command('reset-search', function(){ rctasks.reset_search(); }, true);
   rcmail.register_command('expand-all', function(){ rctasks.expand_collapse(true); }, true);
   rcmail.register_command('collapse-all', function(){ rctasks.expand_collapse(false); }, true);
 
   rctasks.init();
 });