diff --git a/plugins/calendar/calendar_base.js b/plugins/calendar/calendar_base.js
index 3bf7b8b4..c089bbd4 100644
--- a/plugins/calendar/calendar_base.js
+++ b/plugins/calendar/calendar_base.js
@@ -1,122 +1,122 @@
 /**
  * Base Javascript class 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 page.
  *
  * Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
  * Copyright (C) 2013-2015, 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.
  */
 
 // Basic setup for Roundcube calendar client class
 function rcube_calendar(settings)
 {
     // extend base class
     rcube_libcalendaring.call(this, settings);
 
     // create new event from current mail message
     this.create_from_mail = function(uid)
     {
       if (!uid && !(uid = rcmail.get_single_uid())) {
         return;
       }
 
       var url = {_mbox: rcmail.env.mailbox, _uid: uid, _framed: 1},
         buttons = {},
         button_classes = ['mainaction save', 'cancel'],
         title = rcmail.gettext('calendar.createfrommail'),
-            dialog = $('<iframe>').attr({
-                id: 'kolabcalendarinlinegui',
-                name: 'kolabcalendardialog',
-                src: rcmail.url('calendar/dialog-ui', url)
-            });
+        dialog = $('<iframe>').attr({
+            id: 'kolabcalendarinlinegui',
+            name: 'kolabcalendardialog',
+            src: rcmail.url('calendar/dialog-ui', url)
+          });
 
-        // dialog buttons
-        buttons[rcmail.gettext('save')] = function() {
-            var frame = rcmail.get_frame_window('kolabcalendarinlinegui');
-            frame.rcmail.command('event-save');
-        };
+      // dialog buttons
+      buttons[rcmail.gettext('save')] = function() {
+        var frame = rcmail.get_frame_window('kolabcalendarinlinegui');
+        frame.rcmail.command('event-save');
+      };
 
-        buttons[rcmail.gettext('cancel')] = function() {
-            dialog.dialog('destroy');
-        };
+      buttons[rcmail.gettext('cancel')] = function() {
+        dialog.dialog('destroy');
+      };
 
-        // open jquery UI dialog
-        window.kolab_event_dialog_element = dialog = rcmail.show_popup_dialog(dialog, title, buttons, {
-            button_classes: button_classes,
-            minWidth: 500,
-            width: 600,
-            height: 600
-        });
+      // open jquery UI dialog
+      window.kolab_event_dialog_element = dialog = rcmail.show_popup_dialog(dialog, title, buttons, {
+          button_classes: button_classes,
+          minWidth: 500,
+          width: 600,
+          height: 600
+      });
     };
 
     // handler for attachment-save-calendar commands
     this.save_to_calendar = function(p)
     {
       // TODO: show dialog to select the calendar for importing
       if (this.selected_attachment && window.rcube_libcalendaring) {
         rcmail.http_post('calendar/mailimportattach', {
             _uid: rcmail.env.uid,
             _mbox: rcmail.env.mailbox,
             _part: this.selected_attachment
             // _calendar: $('#calendar-attachment-saveto').val(),
           }, rcmail.set_busy(true, 'itip.savingdata'));
       }
-    }
+    };
 }
 
 
 /* calendar plugin initialization (for non-calendar tasks) */
 window.rcmail && rcmail.addEventListener('init', function(evt) {
   if (rcmail.task != 'calendar') {
     var cal = new rcube_calendar($.extend(rcmail.env.calendar_settings, rcmail.env.libcal_settings));
 
     // register create-from-mail command to message_commands array
     if (rcmail.env.task == 'mail') {
       rcmail.register_command('calendar-create-from-mail', function() { cal.create_from_mail(); });
       rcmail.register_command('attachment-save-calendar', function() { cal.save_to_calendar(); });
 
       if (rcmail.env.action != 'show') {
         rcmail.env.message_commands.push('calendar-create-from-mail');
       }
       else {
         rcmail.enable_command('calendar-create-from-mail', true);
       }
 
       rcmail.addEventListener('beforemenu-open', function(p) {
         if (p.menu == 'attachmentmenu') {
           cal.selected_attachment = p.id;
           var mimetype = rcmail.env.attachments[p.id];
           rcmail.enable_command('attachment-save-calendar', mimetype == 'text/calendar' || mimetype == 'text/x-vcalendar' || mimetype == 'application/ics');
         }
       });
     }
   }
 
   rcmail.register_command('plugin.calendar', function() { rcmail.switch_task('calendar'); }, true);
 
   rcmail.addEventListener('plugin.ping_url', function(p) {
     var action = p.action;
     p.action = p.event = null;
     new Image().src = rcmail.url(action, p);
   });
 });