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	/**
	* Roundcube Webmail Client Script
	*
	* This file is part of the Roundcube Webmail client
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this file.
	*
	* Copyright (C) 2005-2015, The Roundcube Dev Team
	* Copyright (C) 2011-2015, Kolab Systems AG
	*
	* The JavaScript code in this page is free software: you can
	* redistribute it and/or modify it under the terms of the GNU
	* General Public License (GNU GPL) as published by the Free Software
	* Foundation, either version 3 of the License, or (at your option)
	* any later version. The code is distributed WITHOUT ANY WARRANTY;
	* without even the implied warranty of MERCHANTABILITY or FITNESS
	* FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
	*
	* As additional permission under GNU GPL version 3 section 7, you
	* may distribute non-source (e.g., minimized or compacted) forms of
	* that code without the copy of the GNU GPL normally required by
	* section 4, provided you include this license notice and a URL
	* through which recipients can access the Corresponding Source.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this file.
	*
	* @author Thomas Bruederli <roundcube@gmail.com>
	* @author Aleksander 'A.L.E.C' Machniak <alec@alec.pl>
	* @author Charles McNulty <charles@charlesmcnulty.com>
	*
	* @requires jquery.js, common.js, list.js
	*/

	function rcube_webmail()
	{
	this.labels = {};
	this.buttons = {};
	this.buttons_sel = {};
	this.gui_objects = {};
	this.gui_containers = {};
	this.commands = {};
	this.command_handlers = {};
	this.onloads = [];
	this.messages = {};
	this.group2expand = {};
	this.http_request_jobs = {};
	this.menu_stack = [];

	// webmail client settings
	this.dblclick_time = 500;
	this.message_time = 5000;
	this.identifier_expr = /[^0-9a-z_-]/gi;

	// environment defaults
	this.env = {
	request_timeout: 180, // seconds
	draft_autosave: 0, // seconds
	comm_path: './',
	recipients_separator: ',',
	recipients_delimiter: ', ',
	popup_width: 1150,
	popup_width_small: 900
	};

	// create protected reference to myself
	this.ref = 'rcmail';
	var ref = this;

	// set jQuery ajax options
	$.ajaxSetup({
	cache: false,
	timeout: this.env.request_timeout * 1000,
	error: function(request, status, err){ ref.http_error(request, status, err); },
	beforeSend: function(xmlhttp){ xmlhttp.setRequestHeader('X-Roundcube-Request', ref.env.request_token); }
	});

	// unload fix
	$(window).on('beforeunload', function() { ref.unload = true; });

	// set environment variable(s)
	this.set_env = function(p, value)
	{
	if (p != null && typeof p === 'object' && !value)
	for (var n in p)
	this.env[n] = p[n];
	else
	this.env[p] = value;
	};

	// add a localized label to the client environment
	this.add_label = function(p, value)
	{
	if (typeof p == 'string')
	this.labels[p] = value;
	else if (typeof p == 'object')
	$.extend(this.labels, p);
	};

	// add a button to the button list
	this.register_button = function(command, id, type, act, sel, over)
	{
	var button_prop = {id:id, type:type};

	if (act) button_prop.act = act;
	if (sel) button_prop.sel = sel;
	if (over) button_prop.over = over;

	if (!this.buttons[command])
	this.buttons[command] = [];

	this.buttons[command].push(button_prop);

	if (this.loaded)
	init_button(command, button_prop);
	};

	// register a specific gui object
	this.gui_object = function(name, id)
	{
	this.gui_objects[name] = this.loaded ? rcube_find_object(id) : id;
	};

	// register a container object
	this.gui_container = function(name, id)
	{
	this.gui_containers[name] = id;
	};

	// add a GUI element (html node) to a specified container
	this.add_element = function(elm, container)
	{
	if (this.gui_containers[container] && this.gui_containers[container].jquery)
	this.gui_containers[container].append(elm);
	};

	// register an external handler for a certain command
	this.register_command = function(command, callback, enable)
	{
	this.command_handlers[command] = callback;

	if (enable)
	this.enable_command(command, true);
	};

	// execute the given script on load
	this.add_onload = function(f)
	{
	this.onloads.push(f);
	};

	// initialize webmail client
	this.init = function()
	{
	var n;
	this.task = this.env.task;

	// check browser capabilities (never use version checks here)
	if (this.env.server_error != 409 && (!bw.dom \|\| !bw.xmlhttp_test())) {
	this.goto_url('error', '_code=0x199');
	return;
	}

	if (!this.env.blankpage)
	this.env.blankpage = this.assets_path('program/resources/blank.gif');

	// find all registered gui containers
	for (n in this.gui_containers)
	this.gui_containers[n] = $('#'+this.gui_containers[n]);

	// find all registered gui objects
	for (n in this.gui_objects)
	this.gui_objects[n] = rcube_find_object(this.gui_objects[n]);

	// clickjacking protection
	if (this.env.x_frame_options) {
	try {
	// bust frame if not allowed
	if (this.env.x_frame_options == 'deny' && top.location.href != self.location.href)
	top.location.href = self.location.href;
	else if (top.location.hostname != self.location.hostname)
	throw 1;
	} catch (e) {
	// possible clickjacking attack: disable all form elements
	$('form').each(function(){ ref.lock_form(this, true); });
	this.display_message("Blocked: possible clickjacking attack!", 'error');
	return;
	}
	}

	// init registered buttons
	this.init_buttons();

	// tell parent window that this frame is loaded
	if (this.is_framed()) {
	parent.rcmail.set_busy(false, null, parent.rcmail.env.frame_lock);
	parent.rcmail.env.frame_lock = null;
	}

	// enable general commands
	this.enable_command('close', 'logout', 'mail', 'addressbook', 'settings', 'save-pref',
	'compose', 'undo', 'about', 'switch-task', 'menu-open', 'menu-close', 'menu-save', true);

	// set active task button
	this.set_button(this.task, 'sel');

	if (this.env.permaurl)
	this.enable_command('permaurl', 'extwin', true);

	switch (this.task) {

	case 'mail':
	// enable mail commands
	this.enable_command('list', 'checkmail', 'add-contact', 'search', 'reset-search', 'collapse-folder', 'import-messages', true);

	if (this.gui_objects.messagelist) {
	this.message_list = new rcube_list_widget(this.gui_objects.messagelist, {
	multiselect:true, multiexpand:true, draggable:true, keyboard:true,
	column_movable:this.env.col_movable, dblclick_time:this.dblclick_time
	});
	this.message_list
	.addEventListener('initrow', function(o) { ref.init_message_row(o); })
	.addEventListener('dblclick', function(o) { ref.msglist_dbl_click(o); })
	.addEventListener('click', function(o) { ref.msglist_click(o); })
	.addEventListener('keypress', function(o) { ref.msglist_keypress(o); })
	.addEventListener('select', function(o) { ref.msglist_select(o); })
	.addEventListener('dragstart', function(o) { ref.drag_start(o); })
	.addEventListener('dragmove', function(e) { ref.drag_move(e); })
	.addEventListener('dragend', function(e) { ref.drag_end(e); })
	.addEventListener('expandcollapse', function(o) { ref.msglist_expand(o); })
	.addEventListener('column_replace', function(o) { ref.msglist_set_coltypes(o); })
	.addEventListener('listupdate', function(o) { ref.triggerEvent('listupdate', o); })
	.init();

	// TODO: this should go into the list-widget code
	$(this.message_list.thead).on('click', 'a.sortcol', function(e){
	return ref.command('sort', $(this).attr('rel'), this);
	});

	this.enable_command('toggle_status', 'toggle_flag', 'sort', true);
	this.enable_command('set-listmode', this.env.threads && !this.is_multifolder_listing());

	// load messages
	this.command('list');

	$(this.gui_objects.qsearchbox).val(this.env.search_text).focusin(function() { ref.message_list.blur(); });
	}

	this.set_button_titles();

	this.env.message_commands = ['show', 'reply', 'reply-all', 'reply-list',
	'move', 'copy', 'delete', 'open', 'mark', 'edit', 'viewsource',
	'print', 'load-attachment', 'download-attachment', 'show-headers', 'hide-headers', 'download',
	'forward', 'forward-inline', 'forward-attachment', 'change-format'];

	if (this.env.action == 'show' \|\| this.env.action == 'preview') {
	this.enable_command(this.env.message_commands, this.env.uid);
	this.enable_command('reply-list', this.env.list_post);

	if (this.env.action == 'show') {
	this.http_request('pagenav', {_uid: this.env.uid, _mbox: this.env.mailbox, _search: this.env.search_request},
	this.display_message('', 'loading'));
	}

	if (this.env.blockedobjects) {
	if (this.gui_objects.remoteobjectsmsg)
	this.gui_objects.remoteobjectsmsg.style.display = 'block';
	this.enable_command('load-images', 'always-load', true);
	}

	// make preview/message frame visible
	if (this.env.action == 'preview' && this.is_framed()) {
	this.enable_command('compose', 'add-contact', false);
	parent.rcmail.show_contentframe(true);
	}

	// initialize drag-n-drop on attachments, so they can e.g.
	// be dropped into mail compose attachments in another window
	if (this.gui_objects.attachments)
	$('li > a', this.gui_objects.attachments).not('.drop').on('dragstart', function(e) {
	var n, href = this.href, dt = e.originalEvent.dataTransfer;
	if (dt) {
	// inject username to the uri
	href = href.replace(/^https?:\/\//, function(m) { return m + urlencode(ref.env.username) + '@'});
	// cleanup the node to get filename without the size test
	n = $(this).clone();
	n.children().remove();

	dt.setData('roundcube-uri', href);
	dt.setData('roundcube-name', $.trim(n.text()));
	}
	});
	}
	else if (this.env.action == 'compose') {
	this.env.address_group_stack = [];
	this.env.compose_commands = ['send-attachment', 'remove-attachment', 'send', 'cancel',
	'toggle-editor', 'list-addresses', 'pushgroup', 'search', 'reset-search', 'extwin',
	'insert-response', 'save-response', 'menu-open', 'menu-close', 'load-attachment',
	'download-attachment', 'open-attachment', 'rename-attachment'];

	if (this.env.drafts_mailbox)
	this.env.compose_commands.push('savedraft')

	this.enable_command(this.env.compose_commands, 'identities', 'responses', true);

	// add more commands (not enabled)
	$.merge(this.env.compose_commands, ['add-recipient', 'firstpage', 'previouspage', 'nextpage', 'lastpage']);

	if (window.googie) {
	this.env.editor_config.spellchecker = googie;
	this.env.editor_config.spellcheck_observer = function(s) { ref.spellcheck_state(); };

	this.env.compose_commands.push('spellcheck')
	this.enable_command('spellcheck', true);
	}

	// initialize HTML editor
	this.editor_init(this.env.editor_config, this.env.composebody);

	// init canned response functions
	if (this.gui_objects.responseslist) {
	$('a.insertresponse', this.gui_objects.responseslist)
	.attr('unselectable', 'on')
	.mousedown(function(e) { return rcube_event.cancel(e); })
	.on('mouseup keypress', function(e) {
	if (e.type == 'mouseup' \|\| rcube_event.get_keycode(e) == 13) {
	ref.command('insert-response', $(this).attr('rel'));
	$(document.body).trigger('mouseup'); // hides the menu
	return rcube_event.cancel(e);
	}
	});

	// avoid textarea loosing focus when hitting the save-response button/link
	$.each(this.buttons['save-response'] \|\| [], function (i, v) {
	$('#' + v.id).mousedown(function(e){ return rcube_event.cancel(e); })
	});
	}

	// init message compose form
	this.init_messageform();
	}
	else if (this.env.action == 'get') {
	this.enable_command('download', 'print', true);
	if (this.env.is_message) {
	this.enable_command('reply', 'reply-all', 'edit', 'viewsource',
	'forward', 'forward-inline', 'forward-attachment', true);
	if (this.env.list_post)
	this.enable_command('reply-list', true);
	}
	}
	// show printing dialog
	else if (this.env.action == 'print' && this.env.uid
	&& !this.env.is_pgp_content && !this.env.pgp_mime_part
	) {
	this.print_dialog();
	}

	// get unread count for each mailbox
	if (this.gui_objects.mailboxlist) {
	this.env.unread_counts = {};
	this.gui_objects.folderlist = this.gui_objects.mailboxlist;
	this.http_request('getunread', {_page: this.env.current_page});
	}

	// init address book widget
	if (this.gui_objects.contactslist) {
	this.contact_list = new rcube_list_widget(this.gui_objects.contactslist,
	{ multiselect:true, draggable:false, keyboard:true });
	this.contact_list
	.addEventListener('initrow', function(o) { ref.triggerEvent('insertrow', { cid:o.uid, row:o }); })
	.addEventListener('select', function(o) { ref.compose_recipient_select(o); })
	.addEventListener('dblclick', function(o) { ref.compose_add_recipient(); })
	.addEventListener('keypress', function(o) {
	if (o.key_pressed == o.ENTER_KEY) {
	if (!ref.compose_add_recipient()) {
	// execute link action on <enter> if not a recipient entry
	if (o.last_selected && String(o.last_selected).charAt(0) == 'G') {
	$(o.rows[o.last_selected].obj).find('a').first().click();
	}
	}
	}
	})
	.init();

	// remember last focused address field
	$('#_to,#_cc,#_bcc').focus(function() { ref.env.focused_field = this; });
	}

	if (this.gui_objects.addressbookslist) {
	this.gui_objects.folderlist = this.gui_objects.addressbookslist;
	this.enable_command('list-addresses', true);
	}

	// ask user to send MDN
	if (this.env.mdn_request && this.env.uid) {
	var postact = 'sendmdn',
	postdata = {_uid: this.env.uid, _mbox: this.env.mailbox};
	if (!confirm(this.get_label('mdnrequest'))) {
	postdata._flag = 'mdnsent';
	postact = 'mark';
	}
	this.http_post(postact, postdata);
	}

	this.check_mailvelope(this.env.action);

	// detect browser capabilities
	if (!this.is_framed() && !this.env.extwin)
	this.browser_capabilities_check();

	break;

	case 'addressbook':
	this.env.address_group_stack = [];

	if (this.gui_objects.folderlist)
	this.env.contactfolders = $.extend($.extend({}, this.env.address_sources), this.env.contactgroups);

	this.enable_command('add', 'import', this.env.writable_source);
	this.enable_command('list', 'listgroup', 'pushgroup', 'popgroup', 'listsearch', 'search', 'reset-search', 'advanced-search', true);

	if (this.gui_objects.contactslist) {
	this.contact_list = new rcube_list_widget(this.gui_objects.contactslist,
	{multiselect:true, draggable:this.gui_objects.folderlist?true:false, keyboard:true});
	this.contact_list
	.addEventListener('initrow', function(o) { ref.triggerEvent('insertrow', { cid:o.uid, row:o }); })
	.addEventListener('keypress', function(o) { ref.contactlist_keypress(o); })
	.addEventListener('select', function(o) { ref.contactlist_select(o); })
	.addEventListener('dragstart', function(o) { ref.drag_start(o); })
	.addEventListener('dragmove', function(e) { ref.drag_move(e); })
	.addEventListener('dragend', function(e) { ref.drag_end(e); })
	.init();

	$(this.gui_objects.qsearchbox).focusin(function() { ref.contact_list.blur(); });

	this.update_group_commands();
	this.command('list');
	}

	if (this.gui_objects.savedsearchlist) {
	this.savedsearchlist = new rcube_treelist_widget(this.gui_objects.savedsearchlist, {
	id_prefix: 'rcmli',
	id_encode: this.html_identifier_encode,
	id_decode: this.html_identifier_decode
	});

	this.savedsearchlist.addEventListener('select', function(node) {
	ref.triggerEvent('selectfolder', { folder:node.id, prefix:'rcmli' }); });
	}

	this.set_page_buttons();

	if (this.env.cid) {
	this.enable_command('show', 'edit', true);
	// register handlers for group assignment via checkboxes
	if (this.gui_objects.editform) {
	$('input.groupmember').change(function() {
	ref.group_member_change(this.checked ? 'add' : 'del', ref.env.cid, ref.env.source, this.value);
	});
	}
	}

	if (this.gui_objects.editform) {
	this.enable_command('save', true);
	if (this.env.action == 'add' \|\| this.env.action == 'edit' \|\| this.env.action == 'search')
	this.init_contact_form();
	}
	else if (this.env.action == 'print') {
	this.print_dialog();
	}

	break;

	case 'settings':
	this.enable_command('preferences', 'identities', 'responses', 'save', 'folders', true);

	if (this.env.action == 'identities') {
	this.enable_command('add', this.env.identities_level < 2);
	}
	else if (this.env.action == 'edit-identity' \|\| this.env.action == 'add-identity') {
	this.enable_command('save', 'edit', 'toggle-editor', true);
	this.enable_command('delete', this.env.identities_level < 2);

	// initialize HTML editor
	this.editor_init(this.env.editor_config, 'rcmfd_signature');
	}
	else if (this.env.action == 'folders') {
	this.enable_command('subscribe', 'unsubscribe', 'create-folder', 'rename-folder', true);
	}
	else if (this.env.action == 'edit-folder' && this.gui_objects.editform) {
	this.enable_command('save', 'folder-size', true);
	parent.rcmail.env.exists = this.env.messagecount;
	parent.rcmail.enable_command('purge', this.env.messagecount);
	}
	else if (this.env.action == 'responses') {
	this.enable_command('add', true);
	}

	if (this.gui_objects.identitieslist) {
	this.identity_list = new rcube_list_widget(this.gui_objects.identitieslist,
	{multiselect:false, draggable:false, keyboard:true});
	this.identity_list
	.addEventListener('select', function(o) { ref.identity_select(o); })
	.addEventListener('keypress', function(o) {
	if (o.key_pressed == o.ENTER_KEY) {
	ref.identity_select(o);
	}
	})
	.init()
	.focus();
	}
	else if (this.gui_objects.sectionslist) {
	this.sections_list = new rcube_list_widget(this.gui_objects.sectionslist, {multiselect:false, draggable:false, keyboard:true});
	this.sections_list
	.addEventListener('select', function(o) { ref.section_select(o); })
	.addEventListener('keypress', function(o) { if (o.key_pressed == o.ENTER_KEY) ref.section_select(o); })
	.init()
	.focus();
	}
	else if (this.gui_objects.subscriptionlist) {
	this.init_subscription_list();
	}
	else if (this.gui_objects.responseslist) {
	this.responses_list = new rcube_list_widget(this.gui_objects.responseslist, {multiselect:false, draggable:false, keyboard:true});
	this.responses_list
	.addEventListener('select', function(list) {
	var win, id = list.get_single_selection();
	ref.enable_command('delete', !!id && $.inArray(id, ref.env.readonly_responses) < 0);
	if (id && (win = ref.get_frame_window(ref.env.contentframe))) {
	ref.set_busy(true);
	ref.location_href({ _action:'edit-response', _key:id, _framed:1 }, win);
	}
	})
	.init()
	.focus();
	}

	break;

	case 'login':
	var tz, tz_name, jstz = window.jstz,
	input_user = $('#rcmloginuser'),
	input_tz = $('#rcmlogintz');

	input_user.keyup(function(e) { return ref.login_user_keyup(e); });

	if (input_user.val() == '')
	input_user.focus();
	else
	$('#rcmloginpwd').focus();

	// detect client timezone
	if (jstz && (tz = jstz.determine()))
	tz_name = tz.name();

	input_tz.val(tz_name ? tz_name : (new Date().getStdTimezoneOffset() / -60));

	// display 'loading' message on form submit, lock submit button
	$('form').submit(function () {
	$('input[type=submit]', this).prop('disabled', true);
	ref.clear_messages();
	ref.display_message('', 'loading');
	});

	this.enable_command('login', true);
	break;
	}

	// select first input field in an edit form
	if (this.gui_objects.editform)
	$("input,select,textarea", this.gui_objects.editform)
	.not(':hidden').not(':disabled').first().select().focus();

	// unset contentframe variable if preview_pane is enabled
	if (this.env.contentframe && !$('#' + this.env.contentframe).is(':visible'))
	this.env.contentframe = null;

	// prevent from form submit with Enter key in file input fields
	if (bw.ie)
	$('input[type=file]').keydown(function(e) { if (e.keyCode == '13') e.preventDefault(); });

	// flag object as complete
	this.loaded = true;
	this.env.lastrefresh = new Date();

	// show message
	if (this.pending_message)
	this.display_message.apply(this, this.pending_message);

	// init treelist widget
	if (this.gui_objects.folderlist && window.rcube_treelist_widget
	// some plugins may load rcube_treelist_widget and there's one case
	// when this will cause problems - addressbook widget in compose,
	// which already has been initialized using rcube_list_widget
	&& this.gui_objects.folderlist != this.gui_objects.addressbookslist
	) {
	this.treelist = new rcube_treelist_widget(this.gui_objects.folderlist, {
	selectable: true,
	id_prefix: 'rcmli',
	parent_focus: true,
	id_encode: this.html_identifier_encode,
	id_decode: this.html_identifier_decode,
	check_droptarget: function(node) { return !node.virtual && ref.check_droptarget(node.id) }
	});

	this.treelist
	.addEventListener('collapse', function(node) { ref.folder_collapsed(node) })
	.addEventListener('expand', function(node) { ref.folder_collapsed(node) })
	.addEventListener('beforeselect', function(node) { return !ref.busy; })
	.addEventListener('select', function(node) { ref.triggerEvent('selectfolder', { folder:node.id, prefix:'rcmli' }) });
	}

	// activate html5 file drop feature (if browser supports it and if configured)
	if (this.gui_objects.filedrop && this.env.filedrop && ((window.XMLHttpRequest && XMLHttpRequest.prototype && XMLHttpRequest.prototype.sendAsBinary) \|\| window.FormData)) {
	$(document.body).on('dragover dragleave drop', function(e) { return ref.document_drag_hover(e, e.type == 'dragover'); });
	$(this.gui_objects.filedrop).addClass('droptarget')
	.on('dragover dragleave', function(e) { return ref.file_drag_hover(e, e.type == 'dragover'); })
	.get(0).addEventListener('drop', function(e) { return ref.file_dropped(e); }, false);
	}

	// catch document (and iframe) mouse clicks
	var body_mouseup = function(e) { return ref.doc_mouse_up(e); };
	$(document.body)
	.mouseup(body_mouseup)
	.keydown(function(e) { return ref.doc_keypress(e); });

	rcube_webmail.set_iframe_events({mouseup: body_mouseup});

	// trigger init event hook
	this.triggerEvent('init', { task:this.task, action:this.env.action });

	// execute all foreign onload scripts
	// @deprecated
	for (n in this.onloads) {
	if (typeof this.onloads[n] === 'string')
	eval(this.onloads[n]);
	else if (typeof this.onloads[n] === 'function')
	this.onloads[n]();
	}

	// start keep-alive and refresh intervals
	this.start_refresh();
	this.start_keepalive();
	};

	this.log = function(msg)
	{
	if (window.console && console.log)
	console.log(msg);
	};

	/*********************************************************/
	/******* client command interface *******/
	/*********************************************************/

	// execute a specific command on the web client
	this.command = function(command, props, obj, event)
	{
	var ret, uid, cid, url, flag, aborted = false;

	if (obj && obj.blur && !(event && rcube_event.is_keyboard(event)))
	obj.blur();

	// do nothing if interface is locked by another command
	// with exception for searching reset and menu
	if (this.busy && !(command == 'reset-search' && this.last_command == 'search') && !command.match(/^menu-/))
	return false;

	// let the browser handle this click (shift/ctrl usually opens the link in a new window/tab)
	if ((obj && obj.href && String(obj.href).indexOf('#') < 0) && rcube_event.get_modifier(event)) {
	return true;
	}

	// command not supported or allowed
	if (!this.commands[command]) {
	// pass command to parent window
	if (this.is_framed())
	parent.rcmail.command(command, props);

	return false;
	}

	// check input before leaving compose step
	if (this.task == 'mail' && this.env.action == 'compose' && !this.env.server_error && command != 'save-pref'
	&& $.inArray(command, this.env.compose_commands) < 0
	) {
	if (!this.env.is_sent && this.cmp_hash != this.compose_field_hash() && !confirm(this.get_label('notsentwarning')))
	return false;

	// remove copy from local storage if compose screen is left intentionally
	this.remove_compose_data(this.env.compose_id);
	this.compose_skip_unsavedcheck = true;
	}

	this.last_command = command;

	// process external commands
	if (typeof this.command_handlers[command] === 'function') {
	ret = this.command_handlers[command](props, obj, event);
	return ret !== undefined ? ret : (obj ? false : true);
	}
	else if (typeof this.command_handlers[command] === 'string') {
	ret = window[this.command_handlers[command]](props, obj, event);
	return ret !== undefined ? ret : (obj ? false : true);
	}

	// trigger plugin hooks
	this.triggerEvent('actionbefore', {props:props, action:command, originalEvent:event});
	ret = this.triggerEvent('before'+command, props \|\| event);
	if (ret !== undefined) {
	// abort if one of the handlers returned false
	if (ret === false)
	return false;
	else
	props = ret;
	}

	ret = undefined;

	// process internal command
	switch (command) {

	case 'login':
	if (this.gui_objects.loginform)
	this.gui_objects.loginform.submit();
	break;

	// commands to switch task
	case 'logout':
	case 'mail':
	case 'addressbook':
	case 'settings':
	this.switch_task(command);
	break;

	case 'about':
	this.redirect('?_task=settings&_action=about', false);
	break;

	case 'permaurl':
	if (obj && obj.href && obj.target)
	return true;
	else if (this.env.permaurl)
	parent.location.href = this.env.permaurl;
	break;

	case 'extwin':
	if (this.env.action == 'compose') {
	var form = this.gui_objects.messageform,
	win = this.open_window('');

	if (win) {
	this.save_compose_form_local();
	this.compose_skip_unsavedcheck = true;
	$("input[name='_action']", form).val('compose');
	form.action = this.url('mail/compose', { _id: this.env.compose_id, _extwin: 1 });
	form.target = win.name;
	form.submit();
	}
	}
	else {
	this.open_window(this.env.permaurl, true);
	}
	break;

	case 'change-format':
	url = this.env.permaurl + '&_format=' + props;

	if (this.env.action == 'preview')
	url = url.replace(/_action=show/, '_action=preview') + '&_framed=1';
	if (this.env.extwin)
	url += '&_extwin=1';

	location.href = url;
	break;

	case 'menu-open':
	if (props && props.menu == 'attachmentmenu') {
	var mimetype = this.env.attachments[props.id];
	if (mimetype && mimetype.mimetype) // in compose format is different
	mimetype = mimetype.mimetype;
	this.enable_command('open-attachment', mimetype && this.env.mimetypes && $.inArray(mimetype, this.env.mimetypes) >= 0);
	}
	this.show_menu(props, props.show \|\| undefined, event);
	break;

	case 'menu-close':
	this.hide_menu(props, event);
	break;

	case 'menu-save':
	this.triggerEvent(command, {props:props, originalEvent:event});
	return false;

	case 'open':
	if (uid = this.get_single_uid()) {
	obj.href = this.url('show', this.params_from_uid(uid));
	return true;
	}
	break;

	case 'close':
	if (this.env.extwin)
	window.close();
	break;

	case 'list':
	if (props && props != '') {
	this.reset_qsearch(true);
	}
	if (this.env.action == 'compose' && this.env.extwin) {
	window.close();
	}
	else if (this.task == 'mail') {
	this.list_mailbox(props);
	this.set_button_titles();
	}
	else if (this.task == 'addressbook')
	this.list_contacts(props);
	break;

	case 'set-listmode':
	this.set_list_options(null, undefined, undefined, props == 'threads' ? 1 : 0);
	break;

	case 'sort':
	var sort_order = this.env.sort_order,
	sort_col = !this.env.disabled_sort_col ? props : this.env.sort_col;

	if (!this.env.disabled_sort_order)
	sort_order = this.env.sort_col == sort_col && sort_order == 'ASC' ? 'DESC' : 'ASC';

	// set table header and update env
	this.set_list_sorting(sort_col, sort_order);

	// reload message list
	this.list_mailbox('', '', sort_col+'_'+sort_order);
	break;

	case 'nextpage':
	this.list_page('next');
	break;

	case 'lastpage':
	this.list_page('last');
	break;

	case 'previouspage':
	this.list_page('prev');
	break;

	case 'firstpage':
	this.list_page('first');
	break;

	case 'expunge':
	if (this.env.exists)
	this.expunge_mailbox(this.env.mailbox);
	break;

	case 'purge':
	case 'empty-mailbox':
	if (this.env.exists)
	this.purge_mailbox(this.env.mailbox);
	break;

	// common commands used in multiple tasks
	case 'show':
	if (this.task == 'mail') {
	uid = this.get_single_uid();
	if (uid && (!this.env.uid \|\| uid != this.env.uid)) {
	if (this.env.mailbox == this.env.drafts_mailbox)
	this.open_compose_step({ _draft_uid: uid, _mbox: this.env.mailbox });
	else
	this.show_message(uid);
	}
	}
	else if (this.task == 'addressbook') {
	cid = props ? props : this.get_single_cid();
	if (cid && !(this.env.action == 'show' && cid == this.env.cid))
	this.load_contact(cid, 'show');
	}
	break;

	case 'add':
	if (this.task == 'addressbook')
	this.load_contact(0, 'add');
	else if (this.task == 'settings' && this.env.action == 'responses') {
	var frame;
	if ((frame = this.get_frame_window(this.env.contentframe))) {
	this.set_busy(true);
	this.location_href({ _action:'add-response', _framed:1 }, frame);
	}
	}
	else if (this.task == 'settings') {
	this.identity_list.clear_selection();
	this.load_identity(0, 'add-identity');
	}
	break;

	case 'edit':
	if (this.task == 'addressbook' && (cid = this.get_single_cid()))
	this.load_contact(cid, 'edit');
	else if (this.task == 'settings' && props)
	this.load_identity(props, 'edit-identity');
	else if (this.task == 'mail' && (uid = this.get_single_uid())) {
	url = { _mbox: this.get_message_mailbox(uid) };
	url[this.env.mailbox == this.env.drafts_mailbox && props != 'new' ? '_draft_uid' : '_uid'] = uid;
	this.open_compose_step(url);
	}
	break;

	case 'save':
	var input, form = this.gui_objects.editform;
	if (form) {
	// adv. search
	if (this.env.action == 'search') {
	}
	// user prefs
	else if ((input = $("input[name='_pagesize']", form)) && input.length && isNaN(parseInt(input.val()))) {
	alert(this.get_label('nopagesizewarning'));
	input.focus();
	break;
	}
	// contacts/identities
	else {
	// reload form
	if (props == 'reload') {
	form.action += '&_reload=1';
	}
	else if (this.task == 'settings' && (this.env.identities_level % 2) == 0 &&
	(input = $("input[name='_email']", form)) && input.length && !rcube_check_email(input.val())
	) {
	alert(this.get_label('noemailwarning'));
	input.focus();
	break;
	}
	}

	// add selected source (on the list)
	if (parent.rcmail && parent.rcmail.env.source)
	form.action = this.add_url(form.action, '_orig_source', parent.rcmail.env.source);

	form.submit();
	}
	break;

	case 'delete':
	// mail task
	if (this.task == 'mail')
	this.delete_messages(event);
	// addressbook task
	else if (this.task == 'addressbook')
	this.delete_contacts();
	// settings: canned response
	else if (this.task == 'settings' && this.env.action == 'responses')
	this.delete_response();
	// settings: user identities
	else if (this.task == 'settings')
	this.delete_identity();
	break;

	// mail task commands
	case 'move':
	case 'moveto': // deprecated
	if (this.task == 'mail')
	this.move_messages(props, event);
	else if (this.task == 'addressbook')
	this.move_contacts(props);
	break;

	case 'copy':
	if (this.task == 'mail')
	this.copy_messages(props, event);
	else if (this.task == 'addressbook')
	this.copy_contacts(props);
	break;

	case 'mark':
	if (props)
	this.mark_message(props);
	break;

	case 'toggle_status':
	case 'toggle_flag':
	flag = command == 'toggle_flag' ? 'flagged' : 'read';

	if (uid = props) {
	// toggle flagged/unflagged
	if (flag == 'flagged') {
	if (this.message_list.rows[uid].flagged)
	flag = 'unflagged';
	}
	// toggle read/unread
	else if (this.message_list.rows[uid].deleted)
	flag = 'undelete';
	else if (!this.message_list.rows[uid].unread)
	flag = 'unread';

	this.mark_message(flag, uid);
	}

	break;

	case 'always-load':
	if (this.env.uid && this.env.sender) {
	this.add_contact(this.env.sender);
	setTimeout(function(){ ref.command('load-images'); }, 300);
	break;
	}

	case 'load-images':
	if (this.env.uid)
	this.show_message(this.env.uid, true, this.env.action=='preview');
	break;

	case 'load-attachment':
	case 'open-attachment':
	case 'download-attachment':
	var params, mimetype = this.env.attachments[props];

	if (this.env.action == 'compose') {
	params = {_file: props, _id: this.env.compose_id};
	mimetype = mimetype ? mimetype.mimetype : '';
	}
	else {
	params = {_mbox: this.env.mailbox, _uid: this.env.uid, _part: props};
	}

	// open attachment in frame if it's of a supported mimetype
	if (command != 'download-attachment' && mimetype && this.env.mimetypes && $.inArray(mimetype, this.env.mimetypes) >= 0) {
	if (this.open_window(this.url('get', $.extend({_frame: 1}, params))))
	break;
	}

	params._download = 1;

	// prevent from page unload warning in compose
	this.compose_skip_unsavedcheck = 1;
	this.goto_url('get', params, false, true);
	this.compose_skip_unsavedcheck = 0;

	break;

	case 'select-all':
	this.select_all_mode = props ? false : true;
	this.dummy_select = true; // prevent msg opening if there's only one msg on the list
	if (props == 'invert')
	this.message_list.invert_selection();
	else
	this.message_list.select_all(props == 'page' ? '' : props);
	this.dummy_select = null;
	break;

	case 'select-none':
	this.select_all_mode = false;
	this.message_list.clear_selection();
	break;

	case 'expand-all':
	this.env.autoexpand_threads = 1;
	this.message_list.expand_all();
	break;

	case 'expand-unread':
	this.env.autoexpand_threads = 2;
	this.message_list.collapse_all();
	this.expand_unread();
	break;

	case 'collapse-all':
	this.env.autoexpand_threads = 0;
	this.message_list.collapse_all();
	break;

	case 'nextmessage':
	if (this.env.next_uid)
	this.show_message(this.env.next_uid, false, this.env.action == 'preview');
	break;

	case 'lastmessage':
	if (this.env.last_uid)
	this.show_message(this.env.last_uid);
	break;

	case 'previousmessage':
	if (this.env.prev_uid)
	this.show_message(this.env.prev_uid, false, this.env.action == 'preview');
	break;

	case 'firstmessage':
	if (this.env.first_uid)
	this.show_message(this.env.first_uid);
	break;

	case 'compose':
	url = {};

	if (this.task == 'mail') {
	url = {_mbox: this.env.mailbox, _search: this.env.search_request};
	if (props)
	url._to = props;
	}
	// modify url if we're in addressbook
	else if (this.task == 'addressbook') {
	// switch to mail compose step directly
	if (props && props.indexOf('@') > 0) {
	url._to = props;
	}
	else {
	var a_cids = [];
	// use contact id passed as command parameter
	if (props)
	a_cids.push(props);
	// get selected contacts
	else if (this.contact_list)
	a_cids = this.contact_list.get_selection();

	if (a_cids.length)
	this.http_post('mailto', { _cid: a_cids.join(','), _source: this.env.source }, true);
	else if (this.env.group)
	this.http_post('mailto', { _gid: this.env.group, _source: this.env.source }, true);

	break;
	}
	}
	else if (props && typeof props == 'string') {
	url._to = props;
	}
	else if (props && typeof props == 'object') {
	$.extend(url, props);
	}

	this.open_compose_step(url);
	break;

	case 'spellcheck':
	if (this.spellcheck_state()) {
	this.editor.spellcheck_stop();
	}
	else {
	this.editor.spellcheck_start();
	}
	break;

	case 'savedraft':
	// Reset the auto-save timer
	clearTimeout(this.save_timer);

	// compose form did not change (and draft wasn't saved already)
	if (this.env.draft_id && this.cmp_hash == this.compose_field_hash()) {
	this.auto_save_start();
	break;
	}

	this.submit_messageform(true);
	break;

	case 'send':
	if (!props.nocheck && !this.env.is_sent && !this.check_compose_input(command))
	break;

	// Reset the auto-save timer
	clearTimeout(this.save_timer);

	this.submit_messageform();
	break;

	case 'send-attachment':
	// Reset the auto-save timer
	clearTimeout(this.save_timer);

	if (!(flag = this.upload_file(props \|\| this.gui_objects.uploadform, 'upload'))) {
	if (flag !== false)
	alert(this.get_label('selectimportfile'));
	aborted = true;
	}
	break;

	case 'insert-sig':
	this.change_identity($("[name='_from']")[0], true);
	break;

	case 'list-addresses':
	this.list_contacts(props);
	this.enable_command('add-recipient', false);
	break;

	case 'add-recipient':
	this.compose_add_recipient(props);
	break;

	case 'reply-all':
	case 'reply-list':
	case 'reply':
	if (uid = this.get_single_uid()) {
	url = {_reply_uid: uid, _mbox: this.get_message_mailbox(uid), _search: this.env.search_request};
	if (command == 'reply-all')
	// do reply-list, when list is detected and popup menu wasn't used
	url._all = (!props && this.env.reply_all_mode == 1 && this.commands['reply-list'] ? 'list' : 'all');
	else if (command == 'reply-list')
	url._all = 'list';

	this.open_compose_step(url);
	}
	break;

	case 'forward-attachment':
	case 'forward-inline':
	case 'forward':
	var uids = this.env.uid ? [this.env.uid] : (this.message_list ? this.message_list.get_selection() : []);
	if (uids.length) {
	url = { _forward_uid: this.uids_to_list(uids), _mbox: this.env.mailbox, _search: this.env.search_request };
	if (command == 'forward-attachment' \|\| (!props && this.env.forward_attachment) \|\| uids.length > 1)
	url._attachment = 1;
	this.open_compose_step(url);
	}
	break;

	case 'print':
	if (this.task == 'addressbook') {
	if (uid = this.contact_list.get_single_selection()) {
	url = '&_action=print&_cid=' + uid;
	if (this.env.source)
	url += '&_source=' + urlencode(this.env.source);
	this.open_window(this.env.comm_path + url, true, true);
	}
	}
	else if (this.env.action == 'get' && !this.env.is_message) {
	this.gui_objects.messagepartframe.contentWindow.print();
	}
	else if (uid = this.get_single_uid()) {
	url = this.url('print', this.params_from_uid(uid, {_safe: this.env.safemode ? 1 : 0}));
	if (this.open_window(url, true, true)) {
	if (this.env.action != 'show' && this.env.action != 'get')
	this.mark_message('read', uid);
	}
	}
	break;

	case 'viewsource':
	if (uid = this.get_single_uid())
	this.open_window(this.url('viewsource', this.params_from_uid(uid)), true, true);
	break;

	case 'download':
	if (this.env.action == 'get') {
	location.href = this.secure_url(location.href.replace(/_frame=/, '_download='));
	}
	else if (uid = this.get_single_uid()) {
	this.goto_url('viewsource', this.params_from_uid(uid, {_save: 1}), false, true);
	}
	break;

	// quicksearch
	case 'search':
	ret = this.qsearch(props);
	break;

	// reset quicksearch
	case 'reset-search':
	var n, s = this.env.search_request \|\| this.env.qsearch;

	this.reset_qsearch(true);

	if (s && this.env.action == 'compose') {
	if (this.contact_list)
	this.list_contacts_clear();
	}
	else if (s && this.env.mailbox) {
	this.list_mailbox(this.env.mailbox, 1);
	}
	else if (s && this.task == 'addressbook') {
	if (this.env.source == '') {
	for (n in this.env.address_sources) break;
	this.env.source = n;
	this.env.group = '';
	}
	this.list_contacts(this.env.source, this.env.group, 1);
	}
	break;

	case 'pushgroup':
	// add group ID and current search to stack
	var group = {
	id: props.id,
	search_request: this.env.search_request,
	page: this.env.current_page,
	search: this.env.search_request && this.gui_objects.qsearchbox ? this.gui_objects.qsearchbox.value : null
	};

	this.env.address_group_stack.push(group);
	if (obj && event)
	rcube_event.cancel(event);

	case 'listgroup':
	this.reset_qsearch();
	this.list_contacts(props.source, props.id, 1, group);
	break;

	case 'popgroup':
	if (this.env.address_group_stack.length) {
	var old = this.env.address_group_stack.pop();
	this.reset_qsearch();

	if (old.search_request) {
	// this code is executed when going back to the search result
	if (old.search && this.gui_objects.qsearchbox)
	$(this.gui_objects.qsearchbox).val(old.search);
	this.env.search_request = old.search_request;
	this.list_contacts_remote(null, null, this.env.current_page = old.page);
	}
	else
	this.list_contacts(props.source, this.env.address_group_stack[this.env.address_group_stack.length-1].id);
	}
	break;

	case 'import-messages':
	var form = props \|\| this.gui_objects.importform,
	importlock = this.set_busy(true, 'importwait');

	$('input[name="_unlock"]', form).val(importlock);

	if (!(flag = this.upload_file(form, 'import', importlock))) {
	this.set_busy(false, null, importlock);
	if (flag !== false)
	alert(this.get_label('selectimportfile'));
	aborted = true;
	}
	break;

	case 'import':
	if (this.env.action == 'import' && this.gui_objects.importform) {
	var file = document.getElementById('rcmimportfile');
	if (file && !file.value) {
	alert(this.get_label('selectimportfile'));
	aborted = true;
	break;
	}
	this.gui_objects.importform.submit();
	this.set_busy(true, 'importwait');
	this.lock_form(this.gui_objects.importform, true);
	}
	else
	this.goto_url('import', (this.env.source ? '_target='+urlencode(this.env.source)+'&' : ''));
	break;

	case 'export':
	if (this.contact_list.rowcount > 0) {
	this.goto_url('export', { _source: this.env.source, _gid: this.env.group, _search: this.env.search_request }, false, true);
	}
	break;

	case 'export-selected':
	if (this.contact_list.rowcount > 0) {
	this.goto_url('export', { _source: this.env.source, _gid: this.env.group, _cid: this.contact_list.get_selection().join(',') }, false, true);
	}
	break;

	case 'upload-photo':
	this.upload_contact_photo(props \|\| this.gui_objects.uploadform);
	break;

	case 'delete-photo':
	this.replace_contact_photo('-del-');
	break;

	// user settings commands
	case 'preferences':
	case 'identities':
	case 'responses':
	case 'folders':
	this.goto_url('settings/' + command);
	break;

	case 'undo':
	this.http_request('undo', '', this.display_message('', 'loading'));
	break;

	// unified command call (command name == function name)
	default:
	var func = command.replace(/-/g, '_');
	if (this[func] && typeof this[func] === 'function') {
	ret = this[func](props, obj, event);
	}
	break;
	}

	if (!aborted && this.triggerEvent('after'+command, props) === false)
	ret = false;
	this.triggerEvent('actionafter', { props:props, action:command, aborted:aborted, ret:ret });

	return ret === false ? false : obj ? false : true;
	};

	// set command(s) enabled or disabled
	this.enable_command = function()
	{
	var i, n, args = Array.prototype.slice.call(arguments),
	enable = args.pop(), cmd;

	for (n=0; n<args.length; n++) {
	cmd = args[n];
	// argument of type array
	if (typeof cmd === 'string') {
	this.commands[cmd] = enable;
	this.set_button(cmd, (enable ? 'act' : 'pas'));
	this.triggerEvent('enable-command', {command: cmd, status: enable});
	}
	// push array elements into commands array
	else {
	for (i in cmd)
	args.push(cmd[i]);
	}
	}
	};

	this.command_enabled = function(cmd)
	{
	return this.commands[cmd];
	};

	// lock/unlock interface
	this.set_busy = function(a, message, id)
	{
	if (a && message) {
	var msg = this.get_label(message);
	if (msg == message)
	msg = 'Loading...';

	id = this.display_message(msg, 'loading');
	}
	else if (!a && id) {
	this.hide_message(id);
	}

	this.busy = a;
	//document.body.style.cursor = a ? 'wait' : 'default';

	if (this.gui_objects.editform)
	this.lock_form(this.gui_objects.editform, a);

	return id;
	};

	// return a localized string
	this.get_label = function(name, domain)
	{
	if (domain && this.labels[domain+'.'+name])
	return this.labels[domain+'.'+name];
	else if (this.labels[name])
	return this.labels[name];
	else
	return name;
	};

	// alias for convenience reasons
	this.gettext = this.get_label;

	// switch to another application task
	this.switch_task = function(task)
	{
	if (this.task === task && task != 'mail')
	return;

	var url = this.get_task_url(task);

	if (task == 'mail')
	url += '&_mbox=INBOX';
	else if (task == 'logout' && !this.env.server_error) {
	url = this.secure_url(url);
	this.clear_compose_data();
	}

	this.redirect(url);
	};

	this.get_task_url = function(task, url)
	{
	if (!url)
	url = this.env.comm_path;

	if (url.match(/[?&]_task=[a-zA-Z0-9_-]+/))
	return url.replace(/_task=[a-zA-Z0-9_-]+/, '_task=' + task);
	else
	return url.replace(/\?.*$/, '') + '?_task=' + task;
	};

	this.reload = function(delay)
	{
	if (this.is_framed())
	parent.rcmail.reload(delay);
	else if (delay)
	setTimeout(function() { ref.reload(); }, delay);
	else if (window.location)
	location.href = this.url('', {_extwin: this.env.extwin});
	};

	// Add variable to GET string, replace old value if exists
	this.add_url = function(url, name, value)
	{
	value = urlencode(value);

	if (/(\?.*)$/.test(url)) {
	var urldata = RegExp.$1,
	datax = RegExp('((\\?\|&)'+RegExp.escape(name)+'=[^&]*)');

	if (datax.test(urldata)) {
	urldata = urldata.replace(datax, RegExp.$2 + name + '=' + value);
	}
	else
	urldata += '&' + name + '=' + value

	return url.replace(/(\?.*)$/, urldata);
	}

	return url + '?' + name + '=' + value;
	};

	// append CSRF protection token to the given url
	this.secure_url = function(url)
	{
	return this.add_url(url, '_token', this.env.request_token);
	},

	this.is_framed = function()
	{
	return this.env.framed && parent.rcmail && parent.rcmail != this && typeof parent.rcmail.command == 'function';
	};

	this.save_pref = function(prop)
	{
	var request = {_name: prop.name, _value: prop.value};

	if (prop.session)
	request._session = prop.session;
	if (prop.env)
	this.env[prop.env] = prop.value;

	this.http_post('save-pref', request);
	};

	this.html_identifier = function(str, encode)
	{
	return encode ? this.html_identifier_encode(str) : String(str).replace(this.identifier_expr, '_');
	};

	this.html_identifier_encode = function(str)
	{
	return Base64.encode(String(str)).replace(/=+$/, '').replace(/\+/g, '-').replace(/\//g, '_');
	};

	this.html_identifier_decode = function(str)
	{
	str = String(str).replace(/-/g, '+').replace(/_/g, '/');

	while (str.length % 4) str += '=';

	return Base64.decode(str);
	};


	/*********************************************************/
	/******* event handling methods *******/
	/*********************************************************/

	this.drag_menu = function(e, target)
	{
	var modkey = rcube_event.get_modifier(e),
	menu = this.gui_objects.dragmenu;

	if (menu && modkey == SHIFT_KEY && this.commands['copy']) {
	var pos = rcube_event.get_mouse_pos(e);
	this.env.drag_target = target;
	this.show_menu(this.gui_objects.dragmenu.id, true, e);
	$(menu).css({top: (pos.y-10)+'px', left: (pos.x-10)+'px'});
	return true;
	}

	return false;
	};

	this.drag_menu_action = function(action)
	{
	var menu = this.gui_objects.dragmenu;
	if (menu) {
	$(menu).hide();
	}
	this.command(action, this.env.drag_target);
	this.env.drag_target = null;
	};

	this.drag_start = function(list)
	{
	this.drag_active = true;

	if (this.preview_timer)
	clearTimeout(this.preview_timer);
	if (this.preview_read_timer)
	clearTimeout(this.preview_read_timer);

	// prepare treelist widget for dragging interactions
	if (this.treelist)
	this.treelist.drag_start();
	};

	this.drag_end = function(e)
	{
	var list, model;

	if (this.treelist)
	this.treelist.drag_end();

	// execute drag & drop action when mouse was released
	if (list = this.message_list)
	model = this.env.mailboxes;
	else if (list = this.contact_list)
	model = this.env.contactfolders;

	if (this.drag_active && model && this.env.last_folder_target) {
	var target = model[this.env.last_folder_target];
	list.draglayer.hide();

	if (this.contact_list) {
	if (!this.contacts_drag_menu(e, target))
	this.command('move', target);
	}
	else if (!this.drag_menu(e, target))
	this.command('move', target);
	}

	this.drag_active = false;
	this.env.last_folder_target = null;
	};

	this.drag_move = function(e)
	{
	if (this.gui_objects.folderlist) {
	var drag_target, oldclass,
	layerclass = 'draglayernormal',
	mouse = rcube_event.get_mouse_pos(e);

	if (this.contact_list && this.contact_list.draglayer)
	oldclass = this.contact_list.draglayer.attr('class');

	// mouse intersects a valid drop target on the treelist
	if (this.treelist && (drag_target = this.treelist.intersects(mouse, true))) {
	this.env.last_folder_target = drag_target;
	layerclass = 'draglayer' + (this.check_droptarget(drag_target) > 1 ? 'copy' : 'normal');
	}
	else {
	// Clear target, otherwise drag end will trigger move into last valid droptarget
	this.env.last_folder_target = null;
	}

	if (layerclass != oldclass && this.contact_list && this.contact_list.draglayer)
	this.contact_list.draglayer.attr('class', layerclass);
	}
	};

	this.collapse_folder = function(name)
	{
	if (this.treelist)
	this.treelist.toggle(name);
	};

	this.folder_collapsed = function(node)
	{
	var prefname = this.env.task == 'addressbook' ? 'collapsed_abooks' : 'collapsed_folders',
	old = this.env[prefname];

	if (node.collapsed) {
	this.env[prefname] = this.env[prefname] + '&'+urlencode(node.id)+'&';

	// select the folder if one of its childs is currently selected
	// don't select if it's virtual (#1488346)
	if (!node.virtual && this.env.mailbox && this.env.mailbox.startsWith(node.id + this.env.delimiter))
	this.command('list', node.id);
	}
	else {
	var reg = new RegExp('&'+urlencode(node.id)+'&');
	this.env[prefname] = this.env[prefname].replace(reg, '');
	}

	if (!this.drag_active) {
	if (old !== this.env[prefname])
	this.command('save-pref', { name: prefname, value: this.env[prefname] });

	if (this.env.unread_counts)
	this.set_unread_count_display(node.id, false);
	}
	};

	// global mouse-click handler to cleanup some UI elements
	this.doc_mouse_up = function(e)
	{
	var list, id, target = rcube_event.get_target(e);

	// ignore event if jquery UI dialog is open
	if ($(target).closest('.ui-dialog, .ui-widget-overlay').length)
	return;

	// remove focus from list widgets
	if (window.rcube_list_widget && rcube_list_widget._instances.length) {
	$.each(rcube_list_widget._instances, function(i,list){
	if (list && !rcube_mouse_is_over(e, list.list.parentNode))
	list.blur();
	});
	}

	// reset 'pressed' buttons
	if (this.buttons_sel) {
	for (id in this.buttons_sel)
	if (typeof id !== 'function')
	this.button_out(this.buttons_sel[id], id);
	this.buttons_sel = {};
	}

	// reset popup menus; delayed to have updated menu_stack data
	setTimeout(function(e){
	var obj, skip, config, id, i, parents = $(target).parents();
	for (i = ref.menu_stack.length - 1; i >= 0; i--) {
	id = ref.menu_stack[i];
	obj = $('#' + id);

	if (obj.is(':visible')
	&& target != obj.data('opener')
	&& target != obj.get(0) // check if scroll bar was clicked (#1489832)
	&& !parents.is(obj.data('opener'))
	&& id != skip
	&& (obj.attr('data-editable') != 'true' \|\| !$(target).parents('#' + id).length)
	&& (obj.attr('data-sticky') != 'true' \|\| !rcube_mouse_is_over(e, obj.get(0)))
	) {
	ref.hide_menu(id, e);
	}
	skip = obj.data('parent');
	}
	}, 10, e);
	};

	// global keypress event handler
	this.doc_keypress = function(e)
	{
	// Helper method to move focus to the next/prev active menu item
	var focus_menu_item = function(dir) {
	var obj, item, mod = dir < 0 ? 'prevAll' : 'nextAll', limit = dir < 0 ? 'last' : 'first';
	if (ref.focused_menu && (obj = $('#'+ref.focused_menu))) {
	item = obj.find(':focus').closest('li')[mod](':has(:not([aria-disabled=true]))').find('a,input')[limit]();
	if (!item.length)
	item = obj.find(':focus').closest('ul')[mod](':has(:not([aria-disabled=true]))').find('a,input')[limit]();
	return item.focus().length;
	}

	return 0;
	};

	var target = e.target \|\| {},
	keyCode = rcube_event.get_keycode(e);

	// save global reference for keyboard detection on click events in IE
	rcube_event._last_keyboard_event = e;

	if (e.keyCode != 27 && (!this.menu_keyboard_active \|\| target.nodeName == 'TEXTAREA' \|\| target.nodeName == 'SELECT')) {
	return true;
	}

	switch (keyCode) {
	case 38:
	case 40:
	case 63232: // "up", in safari keypress
	case 63233: // "down", in safari keypress
	focus_menu_item(keyCode == 38 \|\| keyCode == 63232 ? -1 : 1);
	return rcube_event.cancel(e);

	case 9: // tab
	if (this.focused_menu) {
	var mod = rcube_event.get_modifier(e);
	if (!focus_menu_item(mod == SHIFT_KEY ? -1 : 1)) {
	this.hide_menu(this.focused_menu, e);
	}
	}
	return rcube_event.cancel(e);

	case 27: // esc
	if (this.menu_stack.length)
	this.hide_menu(this.menu_stack[this.menu_stack.length-1], e);
	break;
	}

	return true;
	}

	this.msglist_select = function(list)
	{
	if (this.preview_timer)
	clearTimeout(this.preview_timer);
	if (this.preview_read_timer)
	clearTimeout(this.preview_read_timer);

	var selected = list.get_single_selection();

	this.enable_command(this.env.message_commands, selected != null);
	if (selected) {
	// Hide certain command buttons when Drafts folder is selected
	if (this.env.mailbox == this.env.drafts_mailbox)
	this.enable_command('reply', 'reply-all', 'reply-list', 'forward', 'forward-attachment', 'forward-inline', false);
	// Disable reply-list when List-Post header is not set
	else {
	var msg = this.env.messages[selected];
	if (!msg.ml)
	this.enable_command('reply-list', false);
	}
	}
	// Multi-message commands
	this.enable_command('delete', 'move', 'copy', 'mark', 'forward', 'forward-attachment', list.selection.length > 0);

	// reset all-pages-selection
	if (selected \|\| (list.selection.length && list.selection.length != list.rowcount))
	this.select_all_mode = false;

	// start timer for message preview (wait for double click)
	if (selected && this.env.contentframe && !list.multi_selecting && !this.dummy_select)
	this.preview_timer = setTimeout(function() { ref.msglist_get_preview(); }, this.dblclick_time);
	else if (this.env.contentframe)
	this.show_contentframe(false);
	};

	// This allow as to re-select selected message and display it in preview frame
	this.msglist_click = function(list)
	{
	if (list.multi_selecting \|\| !this.env.contentframe)
	return;

	if (list.get_single_selection())
	return;

	var win = this.get_frame_window(this.env.contentframe);

	if (win && win.location.href.indexOf(this.env.blankpage) >= 0) {
	if (this.preview_timer)
	clearTimeout(this.preview_timer);
	if (this.preview_read_timer)
	clearTimeout(this.preview_read_timer);

	this.preview_timer = setTimeout(function() { ref.msglist_get_preview(); }, this.dblclick_time);
	}
	};

	this.msglist_dbl_click = function(list)
	{
	if (this.preview_timer)
	clearTimeout(this.preview_timer);
	if (this.preview_read_timer)
	clearTimeout(this.preview_read_timer);

	var uid = list.get_single_selection();

	if (uid && (this.env.messages[uid].mbox \|\| this.env.mailbox) == this.env.drafts_mailbox)
	this.open_compose_step({ _draft_uid: uid, _mbox: this.env.mailbox });
	else if (uid)
	this.show_message(uid, false, false);
	};

	this.msglist_keypress = function(list)
	{
	if (list.modkey == CONTROL_KEY)
	return;

	if (list.key_pressed == list.ENTER_KEY)
	this.command('show');
	else if (list.key_pressed == list.DELETE_KEY \|\| list.key_pressed == list.BACKSPACE_KEY)
	this.command('delete');
	else if (list.key_pressed == 33)
	this.command('previouspage');
	else if (list.key_pressed == 34)
	this.command('nextpage');
	};

	this.msglist_get_preview = function()
	{
	var uid = this.get_single_uid();
	if (uid && this.env.contentframe && !this.drag_active)
	this.show_message(uid, false, true);
	else if (this.env.contentframe)
	this.show_contentframe(false);
	};

	this.msglist_expand = function(row)
	{
	if (this.env.messages[row.uid])
	this.env.messages[row.uid].expanded = row.expanded;
	$(row.obj)[row.expanded?'addClass':'removeClass']('expanded');
	};

	this.msglist_set_coltypes = function(list)
	{
	var i, found, name, cols = list.thead.rows[0].cells;

	this.env.listcols = [];

	for (i=0; i<cols.length; i++)
	if (cols[i].id && cols[i].id.startsWith('rcm')) {
	name = cols[i].id.slice(3);
	this.env.listcols.push(name);
	}

	if ((found = $.inArray('flag', this.env.listcols)) >= 0)
	this.env.flagged_col = found;

	if ((found = $.inArray('subject', this.env.listcols)) >= 0)
	this.env.subject_col = found;

	this.command('save-pref', { name: 'list_cols', value: this.env.listcols, session: 'list_attrib/columns' });
	};

	this.check_droptarget = function(id)
	{
	switch (this.task) {
	case 'mail':
	return (this.env.mailboxes[id]
	&& !this.env.mailboxes[id].virtual
	&& (this.env.mailboxes[id].id != this.env.mailbox \|\| this.is_multifolder_listing())) ? 1 : 0;

	case 'addressbook':
	var target;
	if (id != this.env.source && (target = this.env.contactfolders[id])) {
	// droptarget is a group
	if (target.type == 'group') {
	if (target.id != this.env.group && !this.env.contactfolders[target.source].readonly) {
	var is_other = this.env.selection_sources.length > 1 \|\| $.inArray(target.source, this.env.selection_sources) == -1;
	return !is_other \|\| this.commands.move ? 1 : 2;
	}
	}
	// droptarget is a (writable) addressbook and it's not the source
	else if (!target.readonly && (this.env.selection_sources.length > 1 \|\| $.inArray(id, this.env.selection_sources) == -1)) {
	return this.commands.move ? 1 : 2;
	}
	}
	}

	return 0;
	};

	// open popup window
	this.open_window = function(url, small, toolbar)
	{
	var wname = 'rcmextwin' + new Date().getTime();

	url += (url.match(/\?/) ? '&' : '?') + '_extwin=1';

	if (this.env.standard_windows)
	var extwin = window.open(url, wname);
	else {
	var win = this.is_framed() ? parent.window : window,
	page = $(win),
	page_width = page.width(),
	page_height = bw.mz ? $('body', win).height() : page.height(),
	w = Math.min(small ? this.env.popup_width_small : this.env.popup_width, page_width),
	h = page_height, // always use same height
	l = (win.screenLeft \|\| win.screenX) + 20,
	t = (win.screenTop \|\| win.screenY) + 20,
	extwin = window.open(url, wname,
	'width='+w+',height='+h+',top='+t+',left='+l+',resizable=yes,location=no,scrollbars=yes'
	+(toolbar ? ',toolbar=yes,menubar=yes,status=yes' : ',toolbar=no,menubar=no,status=no'));
	}

	// detect popup blocker (#1489618)
	// don't care this might not work with all browsers
	if (!extwin \|\| extwin.closed) {
	this.display_message(this.get_label('windowopenerror'), 'warning');
	return;
	}

	// write loading... message to empty windows
	if (!url && extwin.document) {
	extwin.document.write('<html><body>' + this.get_label('loading') + '</body></html>');
	}

	// allow plugins to grab the window reference (#1489413)
	this.triggerEvent('openwindow', { url:url, handle:extwin });

	// focus window, delayed to bring to front
	setTimeout(function() { extwin && extwin.focus(); }, 10);

	return extwin;
	};


	/*********************************************************/
	/******* (message) list functionality *******/
	/*********************************************************/

	this.init_message_row = function(row)
	{
	var i, fn = {}, uid = row.uid,
	status_icon = (this.env.status_col != null ? 'status' : 'msg') + 'icn' + row.id;

	if (uid && this.env.messages[uid])
	$.extend(row, this.env.messages[uid]);

	// set eventhandler to status icon
	if (row.icon = document.getElementById(status_icon)) {
	fn.icon = function(e) { ref.command('toggle_status', uid); };
	}

	// save message icon position too
	if (this.env.status_col != null)
	row.msgicon = document.getElementById('msgicn'+row.id);
	else
	row.msgicon = row.icon;

	// set eventhandler to flag icon
	if (this.env.flagged_col != null && (row.flagicon = document.getElementById('flagicn'+row.id))) {
	fn.flagicon = function(e) { ref.command('toggle_flag', uid); };
	}

	// set event handler to thread expand/collapse icon
	if (!row.depth && row.has_children && (row.expando = document.getElementById('rcmexpando'+row.id))) {
	fn.expando = function(e) { ref.expand_message_row(e, uid); };
	}

	// attach events
	$.each(fn, function(i, f) {
	row[i].onclick = function(e) { f(e); return rcube_event.cancel(e); };
	if (bw.touch && row[i].addEventListener) {
	row[i].addEventListener('touchend', function(e) {
	if (e.changedTouches.length == 1) {
	f(e);
	return rcube_event.cancel(e);
	}
	}, false);
	}
	});

	this.triggerEvent('insertrow', { uid:uid, row:row });
	};

	// create a table row in the message list
	this.add_message_row = function(uid, cols, flags, attop)
	{
	if (!this.gui_objects.messagelist \|\| !this.message_list)
	return false;

	// Prevent from adding messages from different folder (#1487752)
	if (flags.mbox != this.env.mailbox && !flags.skip_mbox_check)
	return false;

	if (!this.env.messages[uid])
	this.env.messages[uid] = {};

	// merge flags over local message object
	$.extend(this.env.messages[uid], {
	deleted: flags.deleted?1:0,
	replied: flags.answered?1:0,
	unread: !flags.seen?1:0,
	forwarded: flags.forwarded?1:0,
	flagged: flags.flagged?1:0,
	has_children: flags.has_children?1:0,
	depth: flags.depth?flags.depth:0,
	unread_children: flags.unread_children \|\| 0,
	flagged_children: flags.flagged_children \|\| 0,
	parent_uid: flags.parent_uid \|\| 0,
	selected: this.select_all_mode \|\| this.message_list.in_selection(uid),
	ml: flags.ml?1:0,
	ctype: flags.ctype,
	mbox: flags.mbox,
	// flags from plugins
	flags: flags.extra_flags
	});

	var c, n, col, html, css_class, label, status_class = '', status_label = '',
	tree = '', expando = '',
	list = this.message_list,
	rows = list.rows,
	message = this.env.messages[uid],
	msg_id = this.html_identifier(uid,true),
	row_class = 'message'
	+ (!flags.seen ? ' unread' : '')
	+ (flags.deleted ? ' deleted' : '')
	+ (flags.flagged ? ' flagged' : '')
	+ (message.selected ? ' selected' : ''),
	row = { cols:[], style:{}, id:'rcmrow'+msg_id, uid:uid };

	// message status icons
	css_class = 'msgicon';
	if (this.env.status_col === null) {
	css_class += ' status';
	if (flags.deleted) {
	status_class += ' deleted';
	status_label += this.get_label('deleted') + ' ';
	}
	else if (!flags.seen) {
	status_class += ' unread';
	status_label += this.get_label('unread') + ' ';
	}
	else if (flags.unread_children > 0) {
	status_class += ' unreadchildren';
	}
	}
	if (flags.answered) {
	status_class += ' replied';
	status_label += this.get_label('replied') + ' ';
	}
	if (flags.forwarded) {
	status_class += ' forwarded';
	status_label += this.get_label('forwarded') + ' ';
	}

	// update selection
	if (message.selected && !list.in_selection(uid))
	list.selection.push(uid);

	// threads
	if (this.env.threading) {
	if (message.depth) {
	// This assumes that div width is hardcoded to 15px,
	tree += '<span id="rcmtab' + msg_id + '" class="branch" style="width:' + (message.depth * 15) + 'px;">  </span>';

	if ((rows[message.parent_uid] && rows[message.parent_uid].expanded === false)
	\|\| ((this.env.autoexpand_threads == 0 \|\| this.env.autoexpand_threads == 2) &&
	(!rows[message.parent_uid] \|\| !rows[message.parent_uid].expanded))
	) {
	row.style.display = 'none';
	message.expanded = false;
	}
	else
	message.expanded = true;

	row_class += ' thread expanded';
	}
	else if (message.has_children) {
	if (message.expanded === undefined && (this.env.autoexpand_threads == 1 \|\| (this.env.autoexpand_threads == 2 && message.unread_children))) {
	message.expanded = true;
	}

	expando = '<div id="rcmexpando' + row.id + '" class="' + (message.expanded ? 'expanded' : 'collapsed') + '">  </div>';
	row_class += ' thread' + (message.expanded? ' expanded' : '');
	}

	if (flags.unread_children && flags.seen && !message.expanded)
	row_class += ' unroot';

	if (flags.flagged_children && !message.expanded)
	row_class += ' flaggedroot';
	}

	tree += '<span id="msgicn'+row.id+'" class="'+css_class+status_class+'" title="'+status_label+'"></span>';
	row.className = row_class;

	// build subject link
	if (cols.subject) {
	var action = flags.mbox == this.env.drafts_mailbox ? 'compose' : 'show',
	uid_param = flags.mbox == this.env.drafts_mailbox ? '_draft_uid' : '_uid',
	query = { _mbox: flags.mbox };
	query[uid_param] = uid;
	cols.subject = '<a href="' + this.url(action, query) + '" onclick="return rcube_event.keyboard_only(event)"' +
	' onmouseover="rcube_webmail.long_subject_title(this,'+(message.depth+1)+')" tabindex="-1"><span>'+cols.subject+'</span></a>';
	}

	// add each submitted col
	for (n in this.env.listcols) {
	c = this.env.listcols[n];
	col = {className: String(c).toLowerCase(), events:{}};

	if (this.env.coltypes[c] && this.env.coltypes[c].hidden) {
	col.className += ' hidden';
	}

	if (c == 'flag') {
	css_class = (flags.flagged ? 'flagged' : 'unflagged');
	label = this.get_label(css_class);
	html = '<span id="flagicn'+row.id+'" class="'+css_class+'" title="'+label+'"></span>';
	}
	else if (c == 'attachment') {
	label = this.get_label('withattachment');
	if (flags.attachmentClass)
	html = '<span class="'+flags.attachmentClass+'" title="'+label+'"></span>';
	else if (/application\/\|multipart\/(m\|signed)/.test(flags.ctype))
	html = '<span class="attachment" title="'+label+'"></span>';
	else if (/multipart\/report/.test(flags.ctype))
	html = '<span class="report"></span>';
	else if (flags.ctype == 'multipart/encrypted' \|\| flags.ctype == 'application/pkcs7-mime')
	html = '<span class="encrypted"></span>';
	else
	html = ' ';
	}
	else if (c == 'status') {
	label = '';
	if (flags.deleted) {
	css_class = 'deleted';
	label = this.get_label('deleted');
	}
	else if (!flags.seen) {
	css_class = 'unread';
	label = this.get_label('unread');
	}
	else if (flags.unread_children > 0) {
	css_class = 'unreadchildren';
	}
	else
	css_class = 'msgicon';
	html = '<span id="statusicn'+row.id+'" class="'+css_class+status_class+'" title="'+label+'"></span>';
	}
	else if (c == 'threads')
	html = expando;
	else if (c == 'subject') {
	if (bw.ie)
	col.events.mouseover = function() { rcube_webmail.long_subject_title_ex(this); };
	html = tree + cols[c];
	}
	else if (c == 'priority') {
	if (flags.prio > 0 && flags.prio < 6) {
	label = this.get_label('priority') + ' ' + flags.prio;
	html = '<span class="prio'+flags.prio+'" title="'+label+'"></span>';
	}
	else
	html = ' ';
	}
	else if (c == 'folder') {
	html = '<span onmouseover="rcube_webmail.long_subject_title(this)">' + cols[c] + '<span>';
	}
	else
	html = cols[c];

	col.innerHTML = html;
	row.cols.push(col);
	}

	list.insert_row(row, attop);

	// remove 'old' row
	if (attop && this.env.pagesize && list.rowcount > this.env.pagesize) {
	var uid = list.get_last_row();
	list.remove_row(uid);
	list.clear_selection(uid);
	}
	};

	this.set_list_sorting = function(sort_col, sort_order)
	{
	var sort_old = this.env.sort_col == 'arrival' ? 'date' : this.env.sort_col,
	sort_new = sort_col == 'arrival' ? 'date' : sort_col;

	// set table header class
	$('#rcm' + sort_old).removeClass('sorted' + this.env.sort_order.toUpperCase());
	if (sort_new)
	$('#rcm' + sort_new).addClass('sorted' + sort_order);

	// if sorting by 'arrival' is selected, click on date column should not switch to 'date'
	$('#rcmdate > a').prop('rel', sort_col == 'arrival' ? 'arrival' : 'date');

	this.env.sort_col = sort_col;
	this.env.sort_order = sort_order;
	};

	this.set_list_options = function(cols, sort_col, sort_order, threads)
	{
	var update, post_data = {};

	if (sort_col === undefined)
	sort_col = this.env.sort_col;
	if (!sort_order)
	sort_order = this.env.sort_order;

	if (this.env.sort_col != sort_col \|\| this.env.sort_order != sort_order) {
	update = 1;
	this.set_list_sorting(sort_col, sort_order);
	}

	if (this.env.threading != threads) {
	update = 1;
	post_data._threads = threads;
	}

	if (cols && cols.length) {
	// make sure new columns are added at the end of the list
	var i, idx, name, newcols = [], oldcols = this.env.listcols;
	for (i=0; i<oldcols.length; i++) {
	name = oldcols[i];
	idx = $.inArray(name, cols);
	if (idx != -1) {
	newcols.push(name);
	delete cols[idx];
	}
	}
	for (i=0; i<cols.length; i++)
	if (cols[i])
	newcols.push(cols[i]);

	if (newcols.join() != oldcols.join()) {
	update = 1;
	post_data._cols = newcols.join(',');
	}
	}

	if (update)
	this.list_mailbox('', '', sort_col+'_'+sort_order, post_data);
	};

	// when user double-clicks on a row
	this.show_message = function(id, safe, preview)
	{
	if (!id)
	return;

	var win, target = window,
	url = this.params_from_uid(id, {_caps: this.browser_capabilities()});

	if (preview && (win = this.get_frame_window(this.env.contentframe))) {
	target = win;
	url._framed = 1;
	}

	if (safe)
	url._safe = 1;

	// also send search request to get the right messages
	if (this.env.search_request)
	url._search = this.env.search_request;

	if (this.env.extwin)
	url._extwin = 1;

	url = this.url(preview ? 'preview': 'show', url);

	if (preview && String(target.location.href).indexOf(url) >= 0) {
	this.show_contentframe(true);
	}
	else {
	if (!preview && this.env.message_extwin && !this.env.extwin)
	this.open_window(url, true);
	else
	this.location_href(url, target, true);

	// mark as read and change mbox unread counter
	if (preview && this.message_list && this.message_list.rows[id] && this.message_list.rows[id].unread && this.env.preview_pane_mark_read > 0) {
	this.preview_read_timer = setTimeout(function() {
	ref.set_unread_message(id, ref.env.mailbox);
	ref.http_post('mark', {_uid: id, _flag: 'read', _mbox: ref.env.mailbox, _quiet: 1});
	}, this.env.preview_pane_mark_read * 1000);
	}
	}
	};

	// update message status and unread counter after marking a message as read
	this.set_unread_message = function(id, folder)
	{
	var self = this;

	// find window with messages list
	if (!self.message_list)
	self = self.opener();

	if (!self && window.parent)
	self = parent.rcmail;

	if (!self \|\| !self.message_list)
	return;

	// this may fail in multifolder mode
	if (self.set_message(id, 'unread', false) === false)
	self.set_message(id + '-' + folder, 'unread', false);

	if (self.env.unread_counts[folder] > 0) {
	self.env.unread_counts[folder] -= 1;
	self.set_unread_count(folder, self.env.unread_counts[folder], folder == 'INBOX' && !self.is_multifolder_listing());
	}
	};

	this.show_contentframe = function(show)
	{
	var frame, win, name = this.env.contentframe;

	if (name && (frame = this.get_frame_element(name))) {
	if (!show && (win = this.get_frame_window(name))) {
	if (win.location.href.indexOf(this.env.blankpage) < 0) {
	if (win.stop)
	win.stop();
	else // IE
	win.document.execCommand('Stop');

	win.location.href = this.env.blankpage;
	}
	}
	else if (!bw.safari && !bw.konq)
	$(frame)[show ? 'show' : 'hide']();
	}

	if (!show && this.env.frame_lock)
	this.set_busy(false, null, this.env.frame_lock);
	};

	this.get_frame_element = function(id)
	{
	var frame;

	if (id && (frame = document.getElementById(id)))
	return frame;
	};

	this.get_frame_window = function(id)
	{
	var frame = this.get_frame_element(id);

	if (frame && frame.name && window.frames)
	return window.frames[frame.name];
	};

	this.lock_frame = function()
	{
	if (!this.env.frame_lock)
	(this.is_framed() ? parent.rcmail : this).env.frame_lock = this.set_busy(true, 'loading');
	};

	// list a specific page
	this.list_page = function(page)
	{
	if (page == 'next')
	page = this.env.current_page+1;
	else if (page == 'last')
	page = this.env.pagecount;
	else if (page == 'prev' && this.env.current_page > 1)
	page = this.env.current_page-1;
	else if (page == 'first' && this.env.current_page > 1)
	page = 1;

	if (page > 0 && page <= this.env.pagecount) {
	this.env.current_page = page;

	if (this.task == 'addressbook' \|\| this.contact_list)
	this.list_contacts(this.env.source, this.env.group, page);
	else if (this.task == 'mail')
	this.list_mailbox(this.env.mailbox, page);
	}
	};

	// sends request to check for recent messages
	this.checkmail = function()
	{
	var lock = this.set_busy(true, 'checkingmail'),
	params = this.check_recent_params();

	this.http_post('check-recent', params, lock);
	};

	// list messages of a specific mailbox using filter
	this.filter_mailbox = function(filter)
	{
	if (this.filter_disabled)
	return;

	var lock = this.set_busy(true, 'searching');

	this.clear_message_list();

	// reset vars
	this.env.current_page = 1;
	this.env.search_filter = filter;
	this.http_request('search', this.search_params(false, filter), lock);
	};

	// reload the current message listing
	this.refresh_list = function()
	{
	this.list_mailbox(this.env.mailbox, this.env.current_page \|\| 1, null, { _clear:1 }, true);
	if (this.message_list)
	this.message_list.clear_selection();
	};

	// list messages of a specific mailbox
	this.list_mailbox = function(mbox, page, sort, url, update_only)
	{
	var win, target = window;

	if (typeof url != 'object')
	url = {};

	if (!mbox)
	mbox = this.env.mailbox ? this.env.mailbox : 'INBOX';

	// add sort to url if set
	if (sort)
	url._sort = sort;

	// folder change, reset page, search scope, etc.
	if (this.env.mailbox != mbox) {
	page = 1;
	this.env.current_page = page;
	this.env.search_scope = 'base';
	this.select_all_mode = false;
	this.reset_search_filter();
	}
	// also send search request to get the right messages
	else if (this.env.search_request)
	url._search = this.env.search_request;

	if (!update_only) {
	// unselect selected messages and clear the list and message data
	this.clear_message_list();

	if (mbox != this.env.mailbox \|\| (mbox == this.env.mailbox && !page && !sort))
	url._refresh = 1;

	this.select_folder(mbox, '', true);
	this.unmark_folder(mbox, 'recent', '', true);
	this.env.mailbox = mbox;
	}

	// load message list remotely
	if (this.gui_objects.messagelist) {
	this.list_mailbox_remote(mbox, page, url);
	return;
	}

	if (win = this.get_frame_window(this.env.contentframe)) {
	target = win;
	url._framed = 1;
	}

	if (this.env.uid)
	url._uid = this.env.uid;

	// load message list to target frame/window
	if (mbox) {
	this.set_busy(true, 'loading');
	url._mbox = mbox;
	if (page)
	url._page = page;
	this.location_href(url, target);
	}
	};

	this.clear_message_list = function()
	{
	this.env.messages = {};

	this.show_contentframe(false);
	if (this.message_list)
	this.message_list.clear(true);
	};

	// send remote request to load message list
	this.list_mailbox_remote = function(mbox, page, url)
	{
	var lock = this.set_busy(true, 'loading');

	if (typeof url != 'object')
	url = {};
	url._mbox = mbox;
	if (page)
	url._page = page;

	this.http_request('list', url, lock);
	this.update_state({ _mbox: mbox, _page: (page && page > 1 ? page : null) });
	};

	// removes messages that doesn't exists from list selection array
	this.update_selection = function()
	{
	var list = this.message_list,
	selected = list.selection,
	rows = list.rows,
	i, selection = [];

	for (i in selected)
	if (rows[selected[i]])
	selection.push(selected[i]);

	list.selection = selection;

	// reset preview frame, if currently previewed message is not selected (has been removed)
	try {
	var win = this.get_frame_window(this.env.contentframe),
	id = win.rcmail.env.uid;

	if (id && !list.in_selection(id))
	this.show_contentframe(false);
	}
	catch (e) {};
	};

	// expand all threads with unread children
	this.expand_unread = function()
	{
	var r, tbody = this.message_list.tbody,
	new_row = tbody.firstChild;

	while (new_row) {
	if (new_row.nodeType == 1 && (r = this.message_list.rows[new_row.uid]) && r.unread_children) {
	this.message_list.expand_all(r);
	this.set_unread_children(r.uid);
	}

	new_row = new_row.nextSibling;
	}

	return false;
	};

	// thread expanding/collapsing handler
	this.expand_message_row = function(e, uid)
	{
	var row = this.message_list.rows[uid];

	// handle unread_children/flagged_children mark
	row.expanded = !row.expanded;
	this.set_unread_children(uid);
	this.set_flagged_children(uid);
	row.expanded = !row.expanded;

	this.message_list.expand_row(e, uid);
	};

	// message list expanding
	this.expand_threads = function()
	{
	if (!this.env.threading \|\| !this.env.autoexpand_threads \|\| !this.message_list)
	return;

	switch (this.env.autoexpand_threads) {
	case 2: this.expand_unread(); break;
	case 1: this.message_list.expand_all(); break;
	}
	};

	// Initializes threads indicators/expanders after list update
	this.init_threads = function(roots, mbox)
	{
	// #1487752
	if (mbox && mbox != this.env.mailbox)
	return false;

	for (var n=0, len=roots.length; n<len; n++)
	this.add_tree_icons(roots[n]);
	this.expand_threads();
	};

	// adds threads tree icons to the list (or specified thread)
	this.add_tree_icons = function(root)
	{
	var i, l, r, n, len, pos, tmp = [], uid = [],
	row, rows = this.message_list.rows;

	if (root)
	row = rows[root] ? rows[root].obj : null;
	else
	row = this.message_list.tbody.firstChild;

	while (row) {
	if (row.nodeType == 1 && (r = rows[row.uid])) {
	if (r.depth) {
	for (i=tmp.length-1; i>=0; i--) {
	len = tmp[i].length;
	if (len > r.depth) {
	pos = len - r.depth;
	if (!(tmp[i][pos] & 2))
	tmp[i][pos] = tmp[i][pos] ? tmp[i][pos]+2 : 2;
	}
	else if (len == r.depth) {
	if (!(tmp[i][0] & 2))
	tmp[i][0] += 2;
	}
	if (r.depth > len)
	break;
	}

	tmp.push(new Array(r.depth));
	tmp[tmp.length-1][0] = 1;
	uid.push(r.uid);
	}
	else {
	if (tmp.length) {
	for (i in tmp) {
	this.set_tree_icons(uid[i], tmp[i]);
	}
	tmp = [];
	uid = [];
	}
	if (root && row != rows[root].obj)
	break;
	}
	}
	row = row.nextSibling;
	}

	if (tmp.length) {
	for (i in tmp) {
	this.set_tree_icons(uid[i], tmp[i]);
	}
	}
	};

	// adds tree icons to specified message row
	this.set_tree_icons = function(uid, tree)
	{
	var i, divs = [], html = '', len = tree.length;

	for (i=0; i<len; i++) {
	if (tree[i] > 2)
	divs.push({'class': 'l3', width: 15});
	else if (tree[i] > 1)
	divs.push({'class': 'l2', width: 15});
	else if (tree[i] > 0)
	divs.push({'class': 'l1', width: 15});
	// separator div
	else if (divs.length && !divs[divs.length-1]['class'])
	divs[divs.length-1].width += 15;
	else
	divs.push({'class': null, width: 15});
	}

	for (i=divs.length-1; i>=0; i--) {
	if (divs[i]['class'])
	html += '<div class="tree '+divs[i]['class']+'" />';
	else
	html += '<div style="width:'+divs[i].width+'px" />';
	}

	if (html)
	$('#rcmtab'+this.html_identifier(uid, true)).html(html);
	};

	// update parent in a thread
	this.update_thread_root = function(uid, flag)
	{
	if (!this.env.threading)
	return;

	var root = this.message_list.find_root(uid);

	if (uid == root)
	return;

	var p = this.message_list.rows[root];

	if (flag == 'read' && p.unread_children) {
	p.unread_children--;
	}
	else if (flag == 'unread' && p.has_children) {
	// unread_children may be undefined
	p.unread_children = (p.unread_children \|\| 0) + 1;
	}
	else if (flag == 'unflagged' && p.flagged_children) {
	p.flagged_children--;
	}
	else if (flag == 'flagged' && p.has_children) {
	p.flagged_children = (p.flagged_children \|\| 0) + 1;
	}
	else {
	return;
	}

	this.set_message_icon(root);
	this.set_unread_children(root);
	this.set_flagged_children(root);
	};

	// update thread indicators for all messages in a thread below the specified message
	// return number of removed/added root level messages
	this.update_thread = function (uid)
	{
	if (!this.env.threading)
	return 0;

	var r, parent, count = 0,
	rows = this.message_list.rows,
	row = rows[uid],
	depth = rows[uid].depth,
	roots = [];

	if (!row.depth) // root message: decrease roots count
	count--;

	// update unread_children for thread root
	if (row.depth && row.unread) {
	parent = this.message_list.find_root(uid);
	rows[parent].unread_children--;
	this.set_unread_children(parent);
	}

	// update unread_children for thread root
	if (row.depth && row.flagged) {
	parent = this.message_list.find_root(uid);
	rows[parent].flagged_children--;
	this.set_flagged_children(parent);
	}

	parent = row.parent_uid;

	// childrens
	row = row.obj.nextSibling;
	while (row) {
	if (row.nodeType == 1 && (r = rows[row.uid])) {
	if (!r.depth \|\| r.depth <= depth)
	break;

	r.depth--; // move left
	// reset width and clear the content of a tab, icons will be added later
	$('#rcmtab'+r.id).width(r.depth * 15).html('');
	if (!r.depth) { // a new root
	count++; // increase roots count
	r.parent_uid = 0;
	if (r.has_children) {
	// replace 'leaf' with 'collapsed'
	$('#'+r.id+' .leaf:first')
	.attr('id', 'rcmexpando' + r.id)
	.attr('class', (r.obj.style.display != 'none' ? 'expanded' : 'collapsed'))
	.mousedown({uid: r.uid}, function(e) {
	return ref.expand_message_row(e, e.data.uid);
	});

	r.unread_children = 0;
	roots.push(r);
	}
	// show if it was hidden
	if (r.obj.style.display == 'none')
	$(r.obj).show();
	}
	else {
	if (r.depth == depth)
	r.parent_uid = parent;
	if (r.unread && roots.length)
	roots[roots.length-1].unread_children++;
	}
	}
	row = row.nextSibling;
	}

	// update unread_children/flagged_children for roots
	for (r=0; r<roots.length; r++) {
	this.set_unread_children(roots[r].uid);
	this.set_flagged_children(roots[r].uid);
	}

	return count;
	};

	this.delete_excessive_thread_rows = function()
	{
	var rows = this.message_list.rows,
	tbody = this.message_list.tbody,
	row = tbody.firstChild,
	cnt = this.env.pagesize + 1;

	while (row) {
	if (row.nodeType == 1 && (r = rows[row.uid])) {
	if (!r.depth && cnt)
	cnt--;

	if (!cnt)
	this.message_list.remove_row(row.uid);
	}
	row = row.nextSibling;
	}
	};

	// set message icon
	this.set_message_icon = function(uid)
	{
	var css_class, label = '',
	row = this.message_list.rows[uid];

	if (!row)
	return false;

	if (row.icon) {
	css_class = 'msgicon';
	if (row.deleted) {
	css_class += ' deleted';
	label += this.get_label('deleted') + ' ';
	}
	else if (row.unread) {
	css_class += ' unread';
	label += this.get_label('unread') + ' ';
	}
	else if (row.unread_children)
	css_class += ' unreadchildren';
	if (row.msgicon == row.icon) {
	if (row.replied) {
	css_class += ' replied';
	label += this.get_label('replied') + ' ';
	}
	if (row.forwarded) {
	css_class += ' forwarded';
	label += this.get_label('forwarded') + ' ';
	}
	css_class += ' status';
	}

	$(row.icon).attr('class', css_class).attr('title', label);
	}

	if (row.msgicon && row.msgicon != row.icon) {
	label = '';
	css_class = 'msgicon';
	if (!row.unread && row.unread_children) {
	css_class += ' unreadchildren';
	}
	if (row.replied) {
	css_class += ' replied';
	label += this.get_label('replied') + ' ';
	}
	if (row.forwarded) {
	css_class += ' forwarded';
	label += this.get_label('forwarded') + ' ';
	}

	$(row.msgicon).attr('class', css_class).attr('title', label);
	}

	if (row.flagicon) {
	css_class = (row.flagged ? 'flagged' : 'unflagged');
	label = this.get_label(css_class);
	$(row.flagicon).attr('class', css_class)
	.attr('aria-label', label)
	.attr('title', label);
	}
	};

	// set message status
	this.set_message_status = function(uid, flag, status)
	{
	var row = this.message_list.rows[uid];

	if (!row)
	return false;

	if (flag == 'unread') {
	if (row.unread != status)
	this.update_thread_root(uid, status ? 'unread' : 'read');
	}
	else if (flag == 'flagged') {
	this.update_thread_root(uid, status ? 'flagged' : 'unflagged');
	}

	if ($.inArray(flag, ['unread', 'deleted', 'replied', 'forwarded', 'flagged']) > -1)
	row[flag] = status;
	};

	// set message row status, class and icon
	this.set_message = function(uid, flag, status)
	{
	var row = this.message_list && this.message_list.rows[uid];

	if (!row)
	return false;

	if (flag)
	this.set_message_status(uid, flag, status);

	if ($.inArray(flag, ['unread', 'deleted', 'flagged']) > -1)
	$(row.obj)[row[flag] ? 'addClass' : 'removeClass'](flag);

	this.set_unread_children(uid);
	this.set_message_icon(uid);
	};

	// sets unroot (unread_children) class of parent row
	this.set_unread_children = function(uid)
	{
	var row = this.message_list.rows[uid];

	if (row.parent_uid)
	return;

	var enable = !row.unread && row.unread_children && !row.expanded;
	$(row.obj)[enable ? 'addClass' : 'removeClass']('unroot');
	};

	// sets flaggedroot (flagged_children) class of parent row
	this.set_flagged_children = function(uid)
	{
	var row = this.message_list.rows[uid];

	if (row.parent_uid)
	return;

	var enable = row.flagged_children && !row.expanded;
	$(row.obj)[enable ? 'addClass' : 'removeClass']('flaggedroot');
	};

	// copy selected messages to the specified mailbox
	this.copy_messages = function(mbox, event)
	{
	if (mbox && typeof mbox === 'object')
	mbox = mbox.id;
	else if (!mbox)
	return this.folder_selector(event, function(folder) { ref.command('copy', folder); });

	// exit if current or no mailbox specified
	if (!mbox \|\| mbox == this.env.mailbox)
	return;

	var post_data = this.selection_post_data({_target_mbox: mbox});

	// exit if selection is empty
	if (!post_data._uid)
	return;

	// send request to server
	this.http_post('copy', post_data, this.display_message(this.get_label('copyingmessage'), 'loading'));
	};

	// move selected messages to the specified mailbox
	this.move_messages = function(mbox, event)
	{
	if (mbox && typeof mbox === 'object')
	mbox = mbox.id;
	else if (!mbox)
	return this.folder_selector(event, function(folder) { ref.command('move', folder); });

	// exit if current or no mailbox specified
	if (!mbox \|\| (mbox == this.env.mailbox && !this.is_multifolder_listing()))
	return;

	var lock = false, post_data = this.selection_post_data({_target_mbox: mbox});

	// exit if selection is empty
	if (!post_data._uid)
	return;

	// show wait message
	if (this.env.action == 'show')
	lock = this.set_busy(true, 'movingmessage');
	else
	this.show_contentframe(false);

	// Hide message command buttons until a message is selected
	this.enable_command(this.env.message_commands, false);

	this._with_selected_messages('move', post_data, lock);
	};

	// delete selected messages from the current mailbox
	this.delete_messages = function(event)
	{
	var list = this.message_list, trash = this.env.trash_mailbox;

	// if config is set to flag for deletion
	if (this.env.flag_for_deletion) {
	this.mark_message('delete');
	return false;
	}
	// if there isn't a defined trash mailbox or we are in it
	else if (!trash \|\| this.env.mailbox == trash)
	this.permanently_remove_messages();
	// we're in Junk folder and delete_junk is enabled
	else if (this.env.delete_junk && this.env.junk_mailbox && this.env.mailbox == this.env.junk_mailbox)
	this.permanently_remove_messages();
	// if there is a trash mailbox defined and we're not currently in it
	else {
	// if shift was pressed delete it immediately
	if ((list && list.modkey == SHIFT_KEY) \|\| (event && rcube_event.get_modifier(event) == SHIFT_KEY)) {
	if (confirm(this.get_label('deletemessagesconfirm')))
	this.permanently_remove_messages();
	}
	else
	this.move_messages(trash);
	}

	return true;
	};

	// delete the selected messages permanently
	this.permanently_remove_messages = function()
	{
	var post_data = this.selection_post_data();

	// exit if selection is empty
	if (!post_data._uid)
	return;

	this.show_contentframe(false);
	this._with_selected_messages('delete', post_data);
	};

	// Send a specific move/delete request with UIDs of all selected messages
	// @private
	this._with_selected_messages = function(action, post_data, lock)
	{
	var count = 0, msg,
	remove = (action == 'delete' \|\| !this.is_multifolder_listing());

	// update the list (remove rows, clear selection)
	if (this.message_list) {
	var n, id, root, roots = [],
	selection = this.message_list.get_selection();

	for (n=0, len=selection.length; n<len; n++) {
	id = selection[n];

	if (this.env.threading) {
	count += this.update_thread(id);
	root = this.message_list.find_root(id);
	if (root != id && $.inArray(root, roots) < 0) {
	roots.push(root);
	}
	}
	if (remove)
	this.message_list.remove_row(id, (this.env.display_next && n == selection.length-1));
	}
	// make sure there are no selected rows
	if (!this.env.display_next && remove)
	this.message_list.clear_selection();
	// update thread tree icons
	for (n=0, len=roots.length; n<len; n++) {
	this.add_tree_icons(roots[n]);
	}
	}

	if (count < 0)
	post_data._count = (count*-1);
	// remove threads from the end of the list
	else if (count > 0 && remove)
	this.delete_excessive_thread_rows();

	if (!remove)
	post_data._refresh = 1;

	if (!lock) {
	msg = action == 'move' ? 'movingmessage' : 'deletingmessage';
	lock = this.display_message(this.get_label(msg), 'loading');
	}

	// send request to server
	this.http_post(action, post_data, lock);
	};

	// build post data for message delete/move/copy/flag requests
	this.selection_post_data = function(data)
	{
	if (typeof(data) != 'object')
	data = {};

	data._mbox = this.env.mailbox;

	if (!data._uid) {
	var uids = this.env.uid ? [this.env.uid] : this.message_list.get_selection();
	data._uid = this.uids_to_list(uids);
	}

	if (this.env.action)
	data._from = this.env.action;

	// also send search request to get the right messages
	if (this.env.search_request)
	data._search = this.env.search_request;

	if (this.env.display_next && this.env.next_uid)
	data._next_uid = this.env.next_uid;

	return data;
	};

	// set a specific flag to one or more messages
	this.mark_message = function(flag, uid)
	{
	var a_uids = [], r_uids = [], len, n, id,
	list = this.message_list;

	if (uid)
	a_uids[0] = uid;
	else if (this.env.uid)
	a_uids[0] = this.env.uid;
	else if (list)
	a_uids = list.get_selection();

	if (!list)
	r_uids = a_uids;
	else {
	list.focus();
	for (n=0, len=a_uids.length; n<len; n++) {
	id = a_uids[n];
	if ((flag == 'read' && list.rows[id].unread)
	\|\| (flag == 'unread' && !list.rows[id].unread)
	\|\| (flag == 'delete' && !list.rows[id].deleted)
	\|\| (flag == 'undelete' && list.rows[id].deleted)
	\|\| (flag == 'flagged' && !list.rows[id].flagged)
	\|\| (flag == 'unflagged' && list.rows[id].flagged))
	{
	r_uids.push(id);
	}
	}
	}

	// nothing to do
	if (!r_uids.length && !this.select_all_mode)
	return;

	switch (flag) {
	case 'read':
	case 'unread':
	this.toggle_read_status(flag, r_uids);
	break;
	case 'delete':
	case 'undelete':
	this.toggle_delete_status(r_uids);
	break;
	case 'flagged':
	case 'unflagged':
	this.toggle_flagged_status(flag, a_uids);
	break;
	}
	};

	// set class to read/unread
	this.toggle_read_status = function(flag, a_uids)
	{
	var i, len = a_uids.length,
	post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: flag}),
	lock = this.display_message(this.get_label('markingmessage'), 'loading');

	// mark all message rows as read/unread
	for (i=0; i<len; i++)
	this.set_message(a_uids[i], 'unread', (flag == 'unread' ? true : false));

	this.http_post('mark', post_data, lock);
	};

	// set image to flagged or unflagged
	this.toggle_flagged_status = function(flag, a_uids)
	{
	var i, len = a_uids.length,
	post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: flag}),
	lock = this.display_message(this.get_label('markingmessage'), 'loading');

	// mark all message rows as flagged/unflagged
	for (i=0; i<len; i++)
	this.set_message(a_uids[i], 'flagged', (flag == 'flagged' ? true : false));

	this.http_post('mark', post_data, lock);
	};

	// mark all message rows as deleted/undeleted
	this.toggle_delete_status = function(a_uids)
	{
	var len = a_uids.length,
	i, uid, all_deleted = true,
	rows = this.message_list ? this.message_list.rows : {};

	if (len == 1) {
	if (!this.message_list \|\| (rows[a_uids[0]] && !rows[a_uids[0]].deleted))
	this.flag_as_deleted(a_uids);
	else
	this.flag_as_undeleted(a_uids);

	return true;
	}

	for (i=0; i<len; i++) {
	uid = a_uids[i];
	if (rows[uid] && !rows[uid].deleted) {
	all_deleted = false;
	break;
	}
	}

	if (all_deleted)
	this.flag_as_undeleted(a_uids);
	else
	this.flag_as_deleted(a_uids);

	return true;
	};

	this.flag_as_undeleted = function(a_uids)
	{
	var i, len = a_uids.length,
	post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: 'undelete'}),
	lock = this.display_message(this.get_label('markingmessage'), 'loading');

	for (i=0; i<len; i++)
	this.set_message(a_uids[i], 'deleted', false);

	this.http_post('mark', post_data, lock);
	};

	this.flag_as_deleted = function(a_uids)
	{
	var r_uids = [],
	post_data = this.selection_post_data({_uid: this.uids_to_list(a_uids), _flag: 'delete'}),
	lock = this.display_message(this.get_label('markingmessage'), 'loading'),
	rows = this.message_list ? this.message_list.rows : {},
	count = 0;

	for (var i=0, len=a_uids.length; i<len; i++) {
	uid = a_uids[i];
	if (rows[uid]) {
	if (rows[uid].unread)
	r_uids[r_uids.length] = uid;

	if (this.env.skip_deleted) {
	count += this.update_thread(uid);
	this.message_list.remove_row(uid, (this.env.display_next && i == this.message_list.selection.length-1));
	}
	else
	this.set_message(uid, 'deleted', true);
	}
	}

	// make sure there are no selected rows
	if (this.env.skip_deleted && this.message_list) {
	if (!this.env.display_next)
	this.message_list.clear_selection();
	if (count < 0)
	post_data._count = (count*-1);
	else if (count > 0)
	// remove threads from the end of the list
	this.delete_excessive_thread_rows();
	}

	// set of messages to mark as seen
	if (r_uids.length)
	post_data._ruid = this.uids_to_list(r_uids);

	if (this.env.skip_deleted && this.env.display_next && this.env.next_uid)
	post_data._next_uid = this.env.next_uid;

	this.http_post('mark', post_data, lock);
	};

	// flag as read without mark request (called from backend)
	// argument should be a coma-separated list of uids
	this.flag_deleted_as_read = function(uids)
	{
	var uid, i, len,
	rows = this.message_list ? this.message_list.rows : {};

	if (typeof uids == 'string')
	uids = uids.split(',');

	for (i=0, len=uids.length; i<len; i++) {
	uid = uids[i];
	if (rows[uid])
	this.set_message(uid, 'unread', false);
	}
	};

	// Converts array of message UIDs to comma-separated list for use in URL
	// with select_all mode checking
	this.uids_to_list = function(uids)
	{
	return this.select_all_mode ? '*' : (uids.length <= 1 ? uids.join(',') : uids);
	};

	// Sets title of the delete button
	this.set_button_titles = function()
	{
	var label = 'deletemessage';

	if (!this.env.flag_for_deletion
	&& this.env.trash_mailbox && this.env.mailbox != this.env.trash_mailbox
	&& (!this.env.delete_junk \|\| !this.env.junk_mailbox \|\| this.env.mailbox != this.env.junk_mailbox)
	)
	label = 'movemessagetotrash';

	this.set_alttext('delete', label);
	};

	// Initialize input element for list page jump
	this.init_pagejumper = function(element)
	{
	$(element).addClass('rcpagejumper')
	.on('focus', function(e) {
	// create and display popup with page selection
	var i, html = '';

	for (i = 1; i <= ref.env.pagecount; i++)
	html += '<li>' + i + '</li>';

	html = '<ul class="toolbarmenu">' + html + '</ul>';

	if (!ref.pagejump) {
	ref.pagejump = $('<div id="pagejump-selector" class="popupmenu"></div>')
	.appendTo(document.body)
	.on('click', 'li', function() {
	if (!ref.busy)
	$(element).val($(this).text()).change();
	});
	}

	if (ref.pagejump.data('count') != i)
	ref.pagejump.html(html);

	ref.pagejump.attr('rel', '#' + this.id).data('count', i);

	// display page selector
	ref.show_menu('pagejump-selector', true, e);
	$(this).keydown();
	})
	// keyboard navigation
	.on('keydown keyup click', function(e) {
	var current, selector = $('#pagejump-selector'),
	ul = $('ul', selector),
	list = $('li', ul),
	height = ul.height(),
	p = parseInt(this.value);

	if (e.which != 27 && e.which != 9 && e.which != 13 && !selector.is(':visible'))
	return ref.show_menu('pagejump-selector', true, e);

	if (e.type == 'keydown') {
	// arrow-down
	if (e.which == 40) {
	if (list.length > p)
	this.value = (p += 1);
	}
	// arrow-up
	else if (e.which == 38) {
	if (p > 1 && list.length > p - 1)
	this.value = (p -= 1);
	}
	// enter
	else if (e.which == 13) {
	return $(this).change();
	}
	// esc, tab
	else if (e.which == 27 \|\| e.which == 9) {
	return $(element).val(ref.env.current_page);
	}
	}

	$('li.selected', ul).removeClass('selected');

	if ((current = $(list[p - 1])).length) {
	current.addClass('selected');
	$('#pagejump-selector').scrollTop(((ul.height() / list.length) * (p - 1)) - selector.height() / 2);
	}
	})
	.on('change', function(e) {
	// go to specified page
	var p = parseInt(this.value);
	if (p && p != ref.env.current_page && !ref.busy) {
	ref.hide_menu('pagejump-selector');
	ref.list_page(p);
	}
	});
	};

	// Update page-jumper state on list updates
	this.update_pagejumper = function()
	{
	$('input.rcpagejumper').val(this.env.current_page).prop('disabled', this.env.pagecount < 2);
	};

	// check for mailvelope API
	this.check_mailvelope = function(action)
	{
	if (typeof window.mailvelope !== 'undefined') {
	this.mailvelope_load(action);
	}
	else {
	$(window).on('mailvelope', function() {
	ref.mailvelope_load(action);
	});
	}
	};

	// Load Mailvelope functionality (and initialize keyring if needed)
	this.mailvelope_load = function(action)
	{
	if (this.env.browser_capabilities)
	this.env.browser_capabilities['pgpmime'] = 1;

	var keyring = this.env.user_id;

	mailvelope.getKeyring(keyring).then(function(kr) {
	ref.mailvelope_keyring = kr;
	ref.mailvelope_init(action, kr);
	}, function(err) {
	// attempt to create a new keyring for this app/user
	mailvelope.createKeyring(keyring).then(function(kr) {
	ref.mailvelope_keyring = kr;
	ref.mailvelope_init(action, kr);
	}, function(err) {
	console.error(err);
	});
	});
	};

	// Initializes Mailvelope editor or display container
	this.mailvelope_init = function(action, keyring)
	{
	if (!window.mailvelope)
	return;

	if (action == 'show' \|\| action == 'preview' \|\| action == 'print') {
	// decrypt text body
	if (this.env.is_pgp_content) {
	var data = $(this.env.is_pgp_content).text();
	ref.mailvelope_display_container(this.env.is_pgp_content, data, keyring);
	}
	// load pgp/mime message and pass it to the mailvelope display container
	else if (this.env.pgp_mime_part) {
	var msgid = this.display_message(this.get_label('loadingdata'), 'loading'),
	selector = this.env.pgp_mime_container;

	$.ajax({
	type: 'GET',
	url: this.url('get', { '_mbox': this.env.mailbox, '_uid': this.env.uid, '_part': this.env.pgp_mime_part }),
	error: function(o, status, err) {
	ref.http_error(o, status, err, msgid);
	},
	success: function(data) {
	ref.mailvelope_display_container(selector, data, keyring, msgid);
	}
	});
	}
	}
	else if (action == 'compose') {
	this.env.compose_commands.push('compose-encrypted');

	var is_html = $('input[name="_is_html"]').val() > 0;

	if (this.env.pgp_mime_message) {
	// fetch PGP/Mime part and open load into Mailvelope editor
	var lock = this.set_busy(true, this.get_label('loadingdata'));

	$.ajax({
	type: 'GET',
	url: this.url('get', this.env.pgp_mime_message),
	error: function(o, status, err) {
	ref.http_error(o, status, err, lock);
	ref.enable_command('compose-encrypted', !is_html);
	},
	success: function(data) {
	ref.set_busy(false, null, lock);

	if (is_html) {
	ref.command('toggle-editor', {html: false, noconvert: true});
	$('#' + ref.env.composebody).val('');
	}

	ref.compose_encrypted({ quotedMail: data });
	ref.enable_command('compose-encrypted', true);
	}
	});
	}
	else {
	// enable encrypted compose toggle
	this.enable_command('compose-encrypted', !is_html);
	}

	// make sure to disable encryption button after toggling editor into HTML mode
	this.addEventListener('actionafter', function(args) {
	if (args.ret && args.action == 'toggle-editor')
	ref.enable_command('compose-encrypted', !args.props.html);
	});
	}
	};

	// handler for the 'compose-encrypted' command
	this.compose_encrypted = function(props)
	{
	var options, container = $('#' + this.env.composebody).parent();

	// remove Mailvelope editor if active
	if (ref.mailvelope_editor) {
	ref.mailvelope_editor = null;
	ref.compose_skip_unsavedcheck = false;
	ref.set_button('compose-encrypted', 'act');

	container.removeClass('mailvelope')
	.find('iframe:not([aria-hidden=true])').remove();
	$('#' + ref.env.composebody).show();
	$("[name='_pgpmime']").remove();

	// disable commands that operate on the compose body
	ref.enable_command('spellcheck', 'insert-sig', 'toggle-editor', 'insert-response', 'save-response', true);
	ref.triggerEvent('compose-encrypted', { active:false });
	}
	// embed Mailvelope editor container
	else {
	if (this.spellcheck_state())
	this.editor.spellcheck_stop();

	if (props.quotedMail) {
	options = { quotedMail: props.quotedMail, quotedMailIndent: false };
	}
	else {
	options = { predefinedText: $('#' + this.env.composebody).val() };
	}

	if (this.env.compose_mode == 'reply') {
	options.quotedMailIndent = true;
	options.quotedMailHeader = this.env.compose_reply_header;
	}

	mailvelope.createEditorContainer('#' + container.attr('id'), ref.mailvelope_keyring, options).then(function(editor) {
	ref.mailvelope_editor = editor;
	ref.compose_skip_unsavedcheck = true;
	ref.set_button('compose-encrypted', 'sel');

	container.addClass('mailvelope');
	$('#' + ref.env.composebody).hide();

	// disable commands that operate on the compose body
	ref.enable_command('spellcheck', 'insert-sig', 'toggle-editor', 'insert-response', 'save-response', false);
	ref.triggerEvent('compose-encrypted', { active:true });

	// notify user about loosing attachments
	if (ref.env.attachments && !$.isEmptyObject(ref.env.attachments)) {
	alert(ref.get_label('encryptnoattachments'));

	$.each(ref.env.attachments, function(name, attach) {
	ref.remove_from_attachment_list(name);
	});
	}
	}, function(err) {
	console.error(err);
	console.log(options);
	});
	}
	};

	// callback to replace the message body with the full armored
	this.mailvelope_submit_messageform = function(draft, saveonly)
	{
	// get recipients
	var recipients = [];
	$.each(['to', 'cc', 'bcc'], function(i,field) {
	var pos, rcpt, val = $.trim($('[name="_' + field + '"]').val());
	while (val.length && rcube_check_email(val, true)) {
	rcpt = RegExp.$2;
	recipients.push(rcpt);
	val = val.substr(val.indexOf(rcpt) + rcpt.length + 1).replace(/^\s,\s/, '');
	}
	});

	// check if we have keys for all recipients
	var isvalid = recipients.length > 0;
	ref.mailvelope_keyring.validKeyForAddress(recipients).then(function(status) {
	var missing_keys = [];
	$.each(status, function(k,v) {
	if (v === false) {
	isvalid = false;
	missing_keys.push(k);
	}
	});

	// list recipients with missing keys
	if (!isvalid && missing_keys.length) {
	// display dialog with missing keys
	ref.simple_dialog(
	ref.get_label('nopubkeyfor').replace('$email', missing_keys.join(', ')) +
	'<p>' + ref.get_label('searchpubkeyservers') + '</p>',
	'encryptedsendialog',
	function() {
	ref.mailvelope_search_pubkeys(missing_keys, function() {
	return true; // close dialog
	});
	},
	{button: 'search'}
	);
	return false;
	}

	if (!isvalid) {
	if (!recipients.length) {
	alert(ref.get_label('norecipientwarning'));
	$("[name='_to']").focus();
	}
	return false;
	}

	// add sender identity to recipients to be able to decrypt our very own message
	var senders = [], selected_sender = ref.env.identities[$("[name='_from'] option:selected").val()];
	$.each(ref.env.identities, function(k, sender) {
	senders.push(sender.email);
	});

	ref.mailvelope_keyring.validKeyForAddress(senders).then(function(status) {
	valid_sender = null;
	$.each(status, function(k,v) {
	if (v !== false) {
	valid_sender = k;
	if (valid_sender == selected_sender) {
	return false; // break
	}
	}
	});

	if (!valid_sender) {
	if (!confirm(ref.get_label('nopubkeyforsender'))) {
	return false;
	}
	}

	recipients.push(valid_sender);

	ref.mailvelope_editor.encrypt(recipients).then(function(armored) {
	// all checks passed, send message
	var form = ref.gui_objects.messageform,
	hidden = $("[name='_pgpmime']", form),
	msgid = ref.set_busy(true, draft \|\| saveonly ? 'savingmessage' : 'sendingmessage')

	form.target = 'savetarget';
	form._draft.value = draft ? '1' : '';
	form.action = ref.add_url(form.action, '_unlock', msgid);
	form.action = ref.add_url(form.action, '_framed', 1);

	if (saveonly) {
	form.action = ref.add_url(form.action, '_saveonly', 1);
	}

	// send pgp conent via hidden field
	if (!hidden.length) {
	hidden = $('<input type="hidden" name="_pgpmime">').appendTo(form);
	}
	hidden.val(armored);

	form.submit();

	}, function(err) {
	console.log(err);
	}); // mailvelope_editor.encrypt()

	}, function(err) {
	console.error(err);
	}); // mailvelope_keyring.validKeyForAddress(senders)

	}, function(err) {
	console.error(err);
	}); // mailvelope_keyring.validKeyForAddress(recipients)

	return false;
	};

	// wrapper for the mailvelope.createDisplayContainer API call
	this.mailvelope_display_container = function(selector, data, keyring, msgid)
	{
	mailvelope.createDisplayContainer(selector, data, keyring, { showExternalContent: this.env.safemode }).then(function() {
	$(selector).addClass('mailvelope').children().not('iframe').hide();
	ref.hide_message(msgid);
	setTimeout(function() { $(window).resize(); }, 10);
	}, function(err) {
	console.error(err);
	ref.hide_message(msgid);
	ref.display_message('Message decryption failed: ' + err.message, 'error')
	});
	};

	// subroutine to query keyservers for public keys
	this.mailvelope_search_pubkeys = function(emails, resolve, import_handler)
	{
	// query with publickey.js
	var deferreds = [],
	pk = new PublicKey(),
	lock = ref.display_message(ref.get_label('loading'), 'loading');

	$.each(emails, function(i, email) {
	var d = $.Deferred();
	pk.search(email, function(results, errorCode) {
	if (errorCode !== null) {
	// rejecting would make all fail
	// d.reject(email);
	d.resolve([email]);
	}
	else {
	d.resolve([email].concat(results));
	}
	});
	deferreds.push(d);
	});

	$.when.apply($, deferreds).then(function() {
	var missing_keys = [],
	key_selection = [];

	// alanyze results of all queries
	$.each(arguments, function(i, result) {
	var email = result.shift();
	if (!result.length) {
	missing_keys.push(email);
	}
	else {
	key_selection = key_selection.concat(result);
	}
	});

	ref.hide_message(lock);
	resolve(true);

	// show key import dialog
	if (key_selection.length) {
	ref.mailvelope_key_import_dialog(key_selection, import_handler);
	}
	// some keys could not be found
	if (missing_keys.length) {
	ref.display_message(ref.get_label('nopubkeyfor').replace('$email', missing_keys.join(', ')), 'warning');
	}
	}).fail(function() {
	console.error('Pubkey lookup failed with', arguments);
	ref.hide_message(lock);
	ref.display_message('pubkeysearcherror', 'error');
	resolve(false);
	});
	};

	// list the given public keys in a dialog with options to import
	// them into the local Maivelope keyring
	this.mailvelope_key_import_dialog = function(candidates, import_handler)
	{
	var ul = $('<div>').addClass('listing pgpkeyimport');
	$.each(candidates, function(i, keyrec) {
	var li = $('<div>').addClass('key');
	if (keyrec.revoked) li.addClass('revoked');
	if (keyrec.disabled) li.addClass('disabled');
	if (keyrec.expired) li.addClass('expired');

	li.append($('<label>').addClass('keyid').text(ref.get_label('keyid')));
	li.append($('<a>').text(keyrec.keyid.substr(-8).toUpperCase())
	.attr('href', keyrec.info)
	.attr('target', '_blank')
	.attr('tabindex', '-1'));

	li.append($('<label>').addClass('keylen').text(ref.get_label('keylength')));
	li.append($('<span>').text(keyrec.keylen));

	if (keyrec.expirationdate) {
	li.append($('<label>').addClass('keyexpired').text(ref.get_label('keyexpired')));
	li.append($('<span>').text(new Date(keyrec.expirationdate * 1000).toDateString()));
	}

	if (keyrec.revoked) {
	li.append($('<span>').addClass('keyrevoked').text(ref.get_label('keyrevoked')));
	}

	var ul_ = $('<ul>').addClass('uids');
	$.each(keyrec.uids, function(j, uid) {
	var li_ = $('<li>').addClass('uid');
	if (uid.revoked) li_.addClass('revoked');
	if (uid.disabled) li_.addClass('disabled');
	if (uid.expired) li_.addClass('expired');

	ul_.append(li_.text(uid.uid));
	});

	li.append(ul_);
	li.append($('<input>')
	.attr('type', 'button')
	.attr('rel', keyrec.keyid)
	.attr('value', ref.get_label('import'))
	.addClass('button importkey')
	.prop('disabled', keyrec.revoked \|\| keyrec.disabled \|\| keyrec.expired));

	ul.append(li);
	});

	// display dialog with missing keys
	ref.show_popup_dialog(
	$('<div>')
	.append($('<p>').html(ref.get_label('encryptpubkeysfound')))
	.append(ul),
	ref.get_label('importpubkeys'),
	[{
	text: ref.get_label('close'),
	click: function() {
	(ref.is_framed() ? parent.$ : $)(this).dialog('close');
	}
	}]
	);

	// delegate handler for import button clicks
	ul.on('click', 'input.button.importkey', function() {
	var btn = $(this),
	keyid = btn.attr('rel'),
	pk = new PublicKey(),
	lock = ref.display_message(ref.get_label('loading'), 'loading');

	// fetch from keyserver and import to Mailvelope keyring
	pk.get(keyid, function(armored, errorCode) {
	ref.hide_message(lock);

	if (errorCode) {
	ref.display_message(ref.get_label('keyservererror'), 'error');
	return;
	}

	if (import_handler) {
	import_handler(armored);
	return;
	}

	// import to keyring
	ref.mailvelope_keyring.importPublicKey(armored).then(function(status) {
	if (status === 'REJECTED') {
	// alert(ref.get_label('Key import was rejected'));
	}
	else {
	var $key = keyid.substr(-8).toUpperCase();
	btn.closest('.key').fadeOut();
	ref.display_message(ref.get_label('keyimportsuccess').replace('$key', $key), 'confirmation');
	}
	}, function(err) {
	console.log(err);
	});
	});
	});

	};


	/*********************************************************/
	/******* mailbox folders methods *******/
	/*********************************************************/

	this.expunge_mailbox = function(mbox)
	{
	var lock, post_data = {_mbox: mbox};

	// lock interface if it's the active mailbox
	if (mbox == this.env.mailbox) {
	lock = this.set_busy(true, 'loading');
	post_data._reload = 1;
	if (this.env.search_request)
	post_data._search = this.env.search_request;
	}

	// send request to server
	this.http_post('expunge', post_data, lock);
	};

	this.purge_mailbox = function(mbox)
	{
	var lock, post_data = {_mbox: mbox};

	if (!confirm(this.get_label('purgefolderconfirm')))
	return false;

	// lock interface if it's the active mailbox
	if (mbox == this.env.mailbox) {
	lock = this.set_busy(true, 'loading');
	post_data._reload = 1;
	}

	// send request to server
	this.http_post('purge', post_data, lock);
	};

	// test if purge command is allowed
	this.purge_mailbox_test = function()
	{
	return (this.env.exists && (
	this.env.mailbox == this.env.trash_mailbox
	\|\| this.env.mailbox == this.env.junk_mailbox
	\|\| this.env.mailbox.startsWith(this.env.trash_mailbox + this.env.delimiter)
	\|\| this.env.mailbox.startsWith(this.env.junk_mailbox + this.env.delimiter)
	));
	};


	/*********************************************************/
	/******* login form methods *******/
	/*********************************************************/

	// handler for keyboard events on the _user field
	this.login_user_keyup = function(e)
	{
	var key = rcube_event.get_keycode(e),
	passwd = $('#rcmloginpwd');

	// enter
	if (key == 13 && passwd.length && !passwd.val()) {
	passwd.focus();
	return rcube_event.cancel(e);
	}

	return true;
	};


	/*********************************************************/
	/******* message compose methods *******/
	/*********************************************************/

	this.open_compose_step = function(p)
	{
	var url = this.url('mail/compose', p);

	// open new compose window
	if (this.env.compose_extwin && !this.env.extwin) {
	this.open_window(url);
	}
	else {
	this.redirect(url);
	if (this.env.extwin)
	window.resizeTo(Math.max(this.env.popup_width, $(window).width()), $(window).height() + 24);
	}
	};

	// init message compose form: set focus and eventhandlers
	this.init_messageform = function()
	{
	if (!this.gui_objects.messageform)
	return false;

	var i, elem, pos, input_from = $("[name='_from']"),
	input_to = $("[name='_to']"),
	input_subject = $("input[name='_subject']"),
	input_message = $("[name='_message']").get(0),
	html_mode = $("input[name='_is_html']").val() == '1',
	ac_fields = ['cc', 'bcc', 'replyto', 'followupto'],
	ac_props, opener_rc = this.opener();

	// close compose step in opener
	if (opener_rc && opener_rc.env.action == 'compose') {
	setTimeout(function(){
	if (opener.history.length > 1)
	opener.history.back();
	else
	opener_rc.redirect(opener_rc.get_task_url('mail'));
	}, 100);
	this.env.opened_extwin = true;
	}

	// configure parallel autocompletion
	if (this.env.autocomplete_threads > 0) {
	ac_props = {
	threads: this.env.autocomplete_threads,
	sources: this.env.autocomplete_sources
	};
	}

	// init live search events
	this.init_address_input_events(input_to, ac_props);
	for (i in ac_fields) {
	this.init_address_input_events($("[name='_"+ac_fields[i]+"']"), ac_props);
	}

	if (!html_mode) {
	pos = this.env.top_posting && this.env.compose_mode ? 0 : input_message.value.length;

	// add signature according to selected identity
	// if we have HTML editor, signature is added in a callback
	if (input_from.prop('type') == 'select-one') {
	this.change_identity(input_from[0]);
	}

	// set initial cursor position
	this.set_caret_pos(input_message, pos);

	// scroll to the bottom of the textarea (#1490114)
	if (pos) {
	$(input_message).scrollTop(input_message.scrollHeight);
	}
	}

	// check for locally stored compose data
	if (this.env.save_localstorage)
	this.compose_restore_dialog(0, html_mode)

	if (input_to.val() == '')
	elem = input_to;
	else if (input_subject.val() == '')
	elem = input_subject;
	else if (input_message)
	elem = input_message;

	// focus first empty element (need to be visible on IE8)
	$(elem).filter(':visible').focus();

	this.env.compose_focus_elem = document.activeElement;

	// get summary of all field values
	this.compose_field_hash(true);

	// start the auto-save timer
	this.auto_save_start();
	};

	this.compose_restore_dialog = function(j, html_mode)
	{
	var i, key, formdata, index = this.local_storage_get_item('compose.index', []);

	var show_next = function(i) {
	if (++i < index.length)
	ref.compose_restore_dialog(i, html_mode)
	}

	for (i = j \|\| 0; i < index.length; i++) {
	key = index[i];
	formdata = this.local_storage_get_item('compose.' + key, null, true);
	if (!formdata) {
	continue;
	}
	// restore saved copy of current compose_id
	if (formdata.changed && key == this.env.compose_id) {
	this.restore_compose_form(key, html_mode);
	break;
	}
	// skip records from 'other' drafts
	if (this.env.draft_id && formdata.draft_id && formdata.draft_id != this.env.draft_id) {
	continue;
	}
	// skip records on reply
	if (this.env.reply_msgid && formdata.reply_msgid != this.env.reply_msgid) {
	continue;
	}
	// show dialog asking to restore the message
	if (formdata.changed && formdata.session != this.env.session_id) {
	this.show_popup_dialog(
	this.get_label('restoresavedcomposedata')
	.replace('$date', new Date(formdata.changed).toLocaleString())
	.replace('$subject', formdata._subject)
	.replace(/\n/g, '<br/>'),
	this.get_label('restoremessage'),
	[{
	text: this.get_label('restore'),
	'class': 'mainaction',
	click: function(){
	ref.restore_compose_form(key, html_mode);
	ref.remove_compose_data(key); // remove old copy
	ref.save_compose_form_local(); // save under current compose_id
	$(this).dialog('close');
	}
	},
	{
	text: this.get_label('delete'),
	'class': 'delete',
	click: function(){
	ref.remove_compose_data(key);
	$(this).dialog('close');
	show_next(i);
	}
	},
	{
	text: this.get_label('ignore'),
	click: function(){
	$(this).dialog('close');
	show_next(i);
	}
	}]
	);
	break;
	}
	}
	}

	this.init_address_input_events = function(obj, props)
	{
	this.env.recipients_delimiter = this.env.recipients_separator + ' ';

	obj.keydown(function(e) { return ref.ksearch_keydown(e, this, props); })
	.attr({ 'autocomplete': 'off', 'aria-autocomplete': 'list', 'aria-expanded': 'false', 'role': 'combobox' });
	};

	this.submit_messageform = function(draft, saveonly)
	{
	var form = this.gui_objects.messageform;

	if (!form)
	return;

	// the message has been sent but not saved, ask the user what to do
	if (!saveonly && this.env.is_sent) {
	return this.simple_dialog(this.get_label('messageissent'), '',
	function() {
	ref.submit_messageform(false, true);
	return true;
	}
	);
	}

	// delegate sending to Mailvelope routine
	if (this.mailvelope_editor) {
	return this.mailvelope_submit_messageform(draft, saveonly);
	}

	// all checks passed, send message
	var msgid = this.set_busy(true, draft \|\| saveonly ? 'savingmessage' : 'sendingmessage'),
	lang = this.spellcheck_lang(),
	files = [];

	// send files list
	$('li', this.gui_objects.attachmentlist).each(function() { files.push(this.id.replace(/^rcmfile/, '')); });
	$('input[name="_attachments"]', form).val(files.join());

	form.target = 'savetarget';
	form._draft.value = draft ? '1' : '';
	form.action = this.add_url(form.action, '_unlock', msgid);
	form.action = this.add_url(form.action, '_lang', lang);
	form.action = this.add_url(form.action, '_framed', 1);

	if (saveonly) {
	form.action = this.add_url(form.action, '_saveonly', 1);
	}

	// register timer to notify about connection timeout
	this.submit_timer = setTimeout(function(){
	ref.set_busy(false, null, msgid);
	ref.display_message(ref.get_label('requesttimedout'), 'error');
	}, this.env.request_timeout * 1000);

	form.submit();
	};

	this.compose_recipient_select = function(list)
	{
	var id, n, recipients = 0;
	for (n=0; n < list.selection.length; n++) {
	id = list.selection[n];
	if (this.env.contactdata[id])
	recipients++;
	}
	this.enable_command('add-recipient', recipients);
	};

	this.compose_add_recipient = function(field)
	{
	// find last focused field name
	if (!field) {
	field = $(this.env.focused_field).filter(':visible');
	field = field.length ? field.attr('id').replace('_', '') : 'to';
	}

	var recipients = [], input = $('#_'+field), delim = this.env.recipients_delimiter;

	if (this.contact_list && this.contact_list.selection.length) {
	for (var id, n=0; n < this.contact_list.selection.length; n++) {
	id = this.contact_list.selection[n];
	if (id && this.env.contactdata[id]) {
	recipients.push(this.env.contactdata[id]);

	// group is added, expand it
	if (id.charAt(0) == 'E' && this.env.contactdata[id].indexOf('@') < 0 && input.length) {
	var gid = id.substr(1);
	this.group2expand[gid] = { name:this.env.contactdata[id], input:input.get(0) };
	this.http_request('group-expand', {_source: this.env.source, _gid: gid}, false);
	}
	}
	}
	}

	if (recipients.length && input.length) {
	var oldval = input.val(), rx = new RegExp(RegExp.escape(delim) + '\\s*$');
	if (oldval && !rx.test(oldval))
	oldval += delim + ' ';
	input.val(oldval + recipients.join(delim + ' ') + delim + ' ').change();
	this.triggerEvent('add-recipient', { field:field, recipients:recipients });
	}

	return recipients.length;
	};

	// checks the input fields before sending a message
	this.check_compose_input = function(cmd)
	{
	// check input fields
	var input_to = $("[name='_to']"),
	input_cc = $("[name='_cc']"),
	input_bcc = $("[name='_bcc']"),
	input_from = $("[name='_from']"),
	input_subject = $("[name='_subject']");

	// check sender (if have no identities)
	if (input_from.prop('type') == 'text' && !rcube_check_email(input_from.val(), true)) {
	alert(this.get_label('nosenderwarning'));
	input_from.focus();
	return false;
	}

	// check for empty recipient
	var recipients = input_to.val() ? input_to.val() : (input_cc.val() ? input_cc.val() : input_bcc.val());
	if (!rcube_check_email(recipients.replace(/^\s+/, '').replace(/[\s,;]+$/, ''), true)) {
	alert(this.get_label('norecipientwarning'));
	input_to.focus();
	return false;
	}

	// check if all files has been uploaded
	for (var key in this.env.attachments) {
	if (typeof this.env.attachments[key] === 'object' && !this.env.attachments[key].complete) {
	alert(this.get_label('notuploadedwarning'));
	return false;
	}
	}

	// display localized warning for missing subject
	if (input_subject.val() == '') {
	var buttons = {},
	myprompt = $('<div class="prompt">').html('<div class="message">' + this.get_label('nosubjectwarning') + '</div>')
	.appendTo(document.body),
	prompt_value = $('<input>').attr({type: 'text', size: 30}).val(this.get_label('nosubject'))
	.appendTo(myprompt),
	save_func = function() {
	input_subject.val(prompt_value.val());
	myprompt.dialog('close');
	ref.command(cmd, { nocheck:true }); // repeat command which triggered this
	};

	buttons[this.get_label('sendmessage')] = function() {
	save_func($(this));
	};
	buttons[this.get_label('cancel')] = function() {
	input_subject.focus();
	$(this).dialog('close');
	};

	myprompt.dialog({
	modal: true,
	resizable: false,
	buttons: buttons,
	close: function(event, ui) { $(this).remove(); }
	});

	prompt_value.select().keydown(function(e) {
	if (e.which == 13) save_func();
	});

	return false;
	}

	// check for empty body (only possible if not mailvelope encrypted)
	if (!this.mailvelope_editor && !this.editor.get_content() && !confirm(this.get_label('nobodywarning'))) {
	this.editor.focus();
	return false;
	}

	// move body from html editor to textarea (just to be sure, #1485860)
	this.editor.save();

	return true;
	};

	this.toggle_editor = function(props, obj, e)
	{
	// @todo: this should work also with many editors on page
	var result = this.editor.toggle(props.html, props.noconvert \|\| false);

	// satisfy the expectations of aftertoggle-editor event subscribers
	props.mode = props.html ? 'html' : 'plain';

	if (!result && e) {
	// fix selector value if operation failed
	props.mode = props.html ? 'plain' : 'html';
	$(e.target).filter('select').val(props.mode);
	}

	if (result) {
	// update internal format flag
	$("input[name='_is_html']").val(props.html ? 1 : 0);
	}

	return result;
	};

	this.insert_response = function(key)
	{
	var insert = this.env.textresponses[key] ? this.env.textresponses[key].text : null;

	if (!insert)
	return false;

	this.editor.replace(insert);
	};

	/**
	* Open the dialog to save a new canned response
	*/
	this.save_response = function()
	{
	// show dialog to enter a name and to modify the text to be saved
	var buttons = {}, text = this.editor.get_content({selection: true, format: 'text', nosig: true}),
	html = '<form class="propform">' +
	'<div class="prop block"><label>' + this.get_label('responsename') + '</label>' +
	'<input type="text" name="name" id="ffresponsename" size="40" /></div>' +
	'<div class="prop block"><label>' + this.get_label('responsetext') + '</label>' +
	'<textarea name="text" id="ffresponsetext" cols="40" rows="8"></textarea></div>' +
	'</form>';

	buttons[this.get_label('save')] = function(e) {
	var name = $('#ffresponsename').val(),
	text = $('#ffresponsetext').val();

	if (!text) {
	$('#ffresponsetext').select();
	return false;
	}
	if (!name)
	name = text.substring(0,40);

	var lock = ref.display_message(ref.get_label('savingresponse'), 'loading');
	ref.http_post('settings/responses', { _insert:1, _name:name, _text:text }, lock);
	$(this).dialog('close');
	};

	buttons[this.get_label('cancel')] = function() {
	$(this).dialog('close');
	};

	this.show_popup_dialog(html, this.get_label('newresponse'), buttons, {button_classes: ['mainaction']});

	$('#ffresponsetext').val(text);
	$('#ffresponsename').select();
	};

	this.add_response_item = function(response)
	{
	var key = response.key;
	this.env.textresponses[key] = response;

	// append to responses list
	if (this.gui_objects.responseslist) {
	var li = $('<li>').appendTo(this.gui_objects.responseslist);
	$('<a>').addClass('insertresponse active')
	.attr('href', '#')
	.attr('rel', key)
	.attr('tabindex', '0')
	.html(this.quote_html(response.name))
	.appendTo(li)
	.mousedown(function(e) {
	return rcube_event.cancel(e);
	})
	.on('mouseup keypress', function(e) {
	if (e.type == 'mouseup' \|\| rcube_event.get_keycode(e) == 13) {
	ref.command('insert-response', $(this).attr('rel'));
	$(document.body).trigger('mouseup'); // hides the menu
	return rcube_event.cancel(e);
	}
	});
	}
	};

	this.edit_responses = function()
	{
	// TODO: implement inline editing of responses
	};

	this.delete_response = function(key)
	{
	if (!key && this.responses_list) {
	var selection = this.responses_list.get_selection();
	key = selection[0];
	}

	// submit delete request
	if (key && confirm(this.get_label('deleteresponseconfirm'))) {
	this.http_post('settings/delete-response', { _key: key }, false);
	}
	};

	// updates spellchecker buttons on state change
	this.spellcheck_state = function()
	{
	var active = this.editor.spellcheck_state();

	$.each(this.buttons.spellcheck \|\| [], function(i, v) {
	$('#' + v.id)[active ? 'addClass' : 'removeClass']('selected');
	});

	return active;
	};

	// get selected language
	this.spellcheck_lang = function()
	{
	return this.editor.get_language();
	};

	this.spellcheck_lang_set = function(lang)
	{
	this.editor.set_language(lang);
	};

	// resume spellchecking, highlight provided mispellings without new ajax request
	this.spellcheck_resume = function(data)
	{
	this.editor.spellcheck_resume(data);
	};

	this.set_draft_id = function(id)
	{
	if (id && id != this.env.draft_id) {
	var filter = {task: 'mail', action: ''},
	rc = this.opener(false, filter) \|\| this.opener(true, filter);

	// refresh the drafts folder in the opener window
	if (rc && rc.env.mailbox == this.env.drafts_mailbox)
	rc.command('checkmail');

	this.env.draft_id = id;
	$("input[name='_draft_saveid']").val(id);

	// reset history of hidden iframe used for saving draft (#1489643)
	// but don't do this on timer-triggered draft-autosaving (#1489789)
	if (window.frames['savetarget'] && window.frames['savetarget'].history && !this.draft_autosave_submit && !this.mailvelope_editor) {
	window.frames['savetarget'].history.back();
	}

	this.draft_autosave_submit = false;
	}

	// always remove local copy upon saving as draft
	this.remove_compose_data(this.env.compose_id);
	this.compose_skip_unsavedcheck = false;
	};

	this.auto_save_start = function()
	{
	if (this.env.draft_autosave) {
	this.draft_autosave_submit = false;
	this.save_timer = setTimeout(function(){
	ref.draft_autosave_submit = true; // set auto-saved flag (#1489789)
	ref.command("savedraft");
	}, this.env.draft_autosave * 1000);
	}

	// save compose form content to local storage every 5 seconds
	if (!this.local_save_timer && window.localStorage && this.env.save_localstorage) {
	// track typing activity and only save on changes
	this.compose_type_activity = this.compose_type_activity_last = 0;
	$(document).keypress(function(e) { ref.compose_type_activity++; });

	this.local_save_timer = setInterval(function(){
	if (ref.compose_type_activity > ref.compose_type_activity_last) {
	ref.save_compose_form_local();
	ref.compose_type_activity_last = ref.compose_type_activity;
	}
	}, 5000);

	$(window).on('unload', function() {
	// remove copy from local storage if compose screen is left after warning
	if (!ref.env.server_error)
	ref.remove_compose_data(ref.env.compose_id);
	});
	}

	// check for unsaved changes before leaving the compose page
	if (!window.onbeforeunload) {
	window.onbeforeunload = function() {
	if (!ref.compose_skip_unsavedcheck && ref.cmp_hash != ref.compose_field_hash()) {
	return ref.get_label('notsentwarning');
	}
	};
	}

	// Unlock interface now that saving is complete
	this.busy = false;
	};

	this.compose_field_hash = function(save)
	{
	// check input fields
	var i, id, val, str = '', hash_fields = ['to', 'cc', 'bcc', 'subject'];

	for (i=0; i<hash_fields.length; i++)
	if (val = $('[name="_' + hash_fields[i] + '"]').val())
	str += val + ':';

	str += this.editor.get_content({refresh: false});

	if (this.env.attachments)
	for (id in this.env.attachments)
	str += id;

	// we can't detect changes in the Mailvelope editor so assume it changed
	if (this.mailvelope_editor) {
	str += ';' + new Date().getTime();
	}

	if (save)
	this.cmp_hash = str;

	return str;
	};

	// store the contents of the compose form to localstorage
	this.save_compose_form_local = function()
	{
	// feature is disabled
	if (!this.env.save_localstorage)
	return;

	var formdata = { session:this.env.session_id, changed:new Date().getTime() },
	ed, empty = true;

	// get fresh content from editor
	this.editor.save();

	if (this.env.draft_id) {
	formdata.draft_id = this.env.draft_id;
	}
	if (this.env.reply_msgid) {
	formdata.reply_msgid = this.env.reply_msgid;
	}

	$('input, select, textarea', this.gui_objects.messageform).each(function(i, elem) {
	switch (elem.tagName.toLowerCase()) {
	case 'input':
	if (elem.type == 'button' \|\| elem.type == 'submit' \|\| (elem.type == 'hidden' && elem.name != '_is_html')) {
	break;
	}
	formdata[elem.name] = elem.type != 'checkbox' \|\| elem.checked ? $(elem).val() : '';

	if (formdata[elem.name] != '' && elem.type != 'hidden')
	empty = false;
	break;

	case 'select':
	formdata[elem.name] = $('option:checked', elem).val();
	break;

	default:
	formdata[elem.name] = $(elem).val();
	if (formdata[elem.name] != '')
	empty = false;
	}
	});

	if (!empty) {
	var index = this.local_storage_get_item('compose.index', []),
	key = this.env.compose_id;

	if ($.inArray(key, index) < 0) {
	index.push(key);
	}

	this.local_storage_set_item('compose.' + key, formdata, true);
	this.local_storage_set_item('compose.index', index);
	}
	};

	// write stored compose data back to form
	this.restore_compose_form = function(key, html_mode)
	{
	var ed, formdata = this.local_storage_get_item('compose.' + key, true);

	if (formdata && typeof formdata == 'object') {
	$.each(formdata, function(k, value) {
	if (k[0] == '_') {
	var elem = $("*[name='"+k+"']");
	if (elem[0] && elem[0].type == 'checkbox') {
	elem.prop('checked', value != '');
	}
	else {
	elem.val(value);
	}
	}
	});

	// initialize HTML editor
	if ((formdata._is_html == '1' && !html_mode) \|\| (formdata._is_html != '1' && html_mode)) {
	this.command('toggle-editor', {id: this.env.composebody, html: !html_mode, noconvert: true});
	}
	}
	};

	// remove stored compose data from localStorage
	this.remove_compose_data = function(key)
	{
	var index = this.local_storage_get_item('compose.index', []);

	if ($.inArray(key, index) >= 0) {
	this.local_storage_remove_item('compose.' + key);
	this.local_storage_set_item('compose.index', $.grep(index, function(val,i) { return val != key; }));
	}
	};

	// clear all stored compose data of this user
	this.clear_compose_data = function()
	{
	var i, index = this.local_storage_get_item('compose.index', []);

	for (i=0; i < index.length; i++) {
	this.local_storage_remove_item('compose.' + index[i]);
	}

	this.local_storage_remove_item('compose.index');
	};

	this.change_identity = function(obj, show_sig)
	{
	if (!obj \|\| !obj.options)
	return false;

	if (!show_sig)
	show_sig = this.env.show_sig;

	var id = obj.options[obj.selectedIndex].value,
	sig = this.env.identity,
	delim = this.env.recipients_separator,
	rx_delim = RegExp.escape(delim);

	// enable manual signature insert
	if (this.env.signatures && this.env.signatures[id]) {
	this.enable_command('insert-sig', true);
	this.env.compose_commands.push('insert-sig');
	}
	else
	this.enable_command('insert-sig', false);

	// first function execution
	if (!this.env.identities_initialized) {
	this.env.identities_initialized = true;
	if (this.env.show_sig_later)
	this.env.show_sig = true;
	if (this.env.opened_extwin)
	return;
	}

	// update reply-to/bcc fields with addresses defined in identities
	$.each(['replyto', 'bcc'], function() {
	var rx, key = this,
	old_val = sig && ref.env.identities[sig] ? ref.env.identities[sig][key] : '',
	new_val = id && ref.env.identities[id] ? ref.env.identities[id][key] : '',
	input = $('[name="_'+key+'"]'), input_val = input.val();

	// remove old address(es)
	if (old_val && input_val) {
	rx = new RegExp('\\s' + RegExp.escape(old_val) + '\\s');
	input_val = input_val.replace(rx, '');
	}

	// cleanup
	rx = new RegExp(rx_delim + '\\s*' + rx_delim, 'g');
	input_val = String(input_val).replace(rx, delim);
	rx = new RegExp('^[\\s' + rx_delim + ']+');
	input_val = input_val.replace(rx, '');

	// add new address(es)
	if (new_val && input_val.indexOf(new_val) == -1 && input_val.indexOf(new_val.replace(/"/g, '')) == -1) {
	if (input_val) {
	rx = new RegExp('[' + rx_delim + '\\s]+$')
	input_val = input_val.replace(rx, '') + delim + ' ';
	}

	input_val += new_val + delim + ' ';
	}

	if (old_val \|\| new_val)
	input.val(input_val).change();
	});

	this.editor.change_signature(id, show_sig);
	this.env.identity = id;
	this.triggerEvent('change_identity');
	return true;
	};

	// Open file selection dialog for defined upload form
	// Works only on click and only with smart-upload forms
	this.upload_input = function(name)
	{
	$('#' + name + ' input[type="file"]').click();
	};

	// upload (attachment) file
	this.upload_file = function(form, action, lock)
	{
	if (!form)
	return;

	// count files and size on capable browser
	var size = 0, numfiles = 0;

	$.each($(form).get(0).elements \|\| [], function() {
	if (this.type != 'file')
	return;

	var i, files = this.files ? this.files.length : (this.value ? 1 : 0);

	// check file size
	if (this.files) {
	for (i=0; i < files; i++)
	size += this.files[i].size;
	}

	numfiles += files;
	});

	// create hidden iframe and post upload form
	if (numfiles) {
	if (this.env.max_filesize && this.env.filesizeerror && size > this.env.max_filesize) {
	this.display_message(this.env.filesizeerror, 'error');
	return false;
	}

	var frame_name = this.async_upload_form(form, action \|\| 'upload', function(e) {
	var d, content = '';
	try {
	if (this.contentDocument) {
	d = this.contentDocument;
	} else if (this.contentWindow) {
	d = this.contentWindow.document;
	}
	content = d.childNodes[1].innerHTML;
	} catch (err) {}

	if (!content.match(/add2attachment/) && (!bw.opera \|\| (ref.env.uploadframe && ref.env.uploadframe == e.data.ts))) {
	if (!content.match(/display_message/))
	ref.display_message(ref.get_label('fileuploaderror'), 'error');
	ref.remove_from_attachment_list(e.data.ts);

	if (lock)
	ref.set_busy(false, null, lock);
	}
	// Opera hack: handle double onload
	if (bw.opera)
	ref.env.uploadframe = e.data.ts;
	});

	// display upload indicator and cancel button
	var content = '<span>' + this.get_label('uploading' + (numfiles > 1 ? 'many' : '')) + '</span>',
	ts = frame_name.replace(/^rcmupload/, '');

	this.add2attachment_list(ts, { name:'', html:content, classname:'uploading', frame:frame_name, complete:false });

	// upload progress support
	if (this.env.upload_progress_time) {
	this.upload_progress_start('upload', ts);
	}

	// set reference to the form object
	this.gui_objects.attachmentform = form;
	return true;
	}
	};

	// add file name to attachment list
	// called from upload page
	this.add2attachment_list = function(name, att, upload_id)
	{
	if (upload_id)
	this.triggerEvent('fileuploaded', {name: name, attachment: att, id: upload_id});

	if (!this.env.attachments)
	this.env.attachments = {};

	if (upload_id && this.env.attachments[upload_id])
	delete this.env.attachments[upload_id];

	this.env.attachments[name] = att;

	if (!this.gui_objects.attachmentlist)
	return false;

	if (!att.complete && this.env.loadingicon)
	att.html = '<img src="'+this.env.loadingicon+'" alt="" class="uploading" />' + att.html;

	if (!att.complete && att.frame)
	att.html = '<a title="'+this.get_label('cancel')+'" onclick="return rcmail.cancel_attachment_upload(\''+name+'\', \''+att.frame+'\');" href="#cancelupload" class="cancelupload">'
	+ (this.env.cancelicon ? '<img src="'+this.env.cancelicon+'" alt="'+this.get_label('cancel')+'" />' : this.get_label('cancel')) + '</a>' + att.html;

	var indicator, li = $('<li>');

	li.attr('id', name)
	.addClass(att.classname)
	.html(att.html)
	.on('mouseover', function() { rcube_webmail.long_subject_title_ex(this); });

	// replace indicator's li
	if (upload_id && (indicator = document.getElementById(upload_id))) {
	li.replaceAll(indicator);
	}
	else { // add new li
	li.appendTo(this.gui_objects.attachmentlist);
	}

	// set tabindex attribute
	var tabindex = $(this.gui_objects.attachmentlist).attr('data-tabindex') \|\| '0';
	li.find('a').attr('tabindex', tabindex);

	this.triggerEvent('fileappended', {name: name, attachment: att, id: upload_id, item: li});

	return true;
	};

	this.remove_from_attachment_list = function(name)
	{
	if (this.env.attachments) {
	delete this.env.attachments[name];
	$('#'+name).remove();
	}
	};

	this.remove_attachment = function(name)
	{
	if (name && this.env.attachments[name])
	this.http_post('remove-attachment', { _id:this.env.compose_id, _file:name });

	return false;
	};

	this.cancel_attachment_upload = function(name, frame_name)
	{
	if (!name \|\| !frame_name)
	return false;

	this.remove_from_attachment_list(name);
	$("iframe[name='"+frame_name+"']").remove();
	return false;
	};

	this.upload_progress_start = function(action, name)
	{
	setTimeout(function() { ref.http_request(action, {_progress: name}); },
	this.env.upload_progress_time * 1000);
	};

	this.upload_progress_update = function(param)
	{
	var elem = $('#'+param.name + ' > span');

	if (!elem.length \|\| !param.text)
	return;

	elem.text(param.text);

	if (!param.done)
	this.upload_progress_start(param.action, param.name);
	};

	// rename uploaded attachment (in compose)
	this.rename_attachment = function(id)
	{
	var attachment = this.env.attachments ? this.env.attachments[id] : null;

	if (!attachment)
	return;

	var input = $('<input>').attr({type: 'text', size: 50}).val(attachment.name),
	content = $('<label>').text(this.get_label('namex')).append(input);

	this.simple_dialog(content, 'attachmentrename', function() {
	var name;
	if ((name = input.val()) && name != attachment.name) {
	ref.http_post('rename-attachment', {_id: ref.env.compose_id, _file: id, _name: name},
	ref.set_busy(true, 'loading'));
	return true;
	}
	},
	{open: function() { input.select(); }}
	);
	};

	// update attachments list with the new name
	this.rename_attachment_handler = function(id, name)
	{
	var attachment = this.env.attachments ? this.env.attachments[id] : null,
	item = $('#' + id + ' > a.filename'),
	link = $('<a>');

	if (!attachment \|\| !name)
	return;

	attachment.name = name;

	// update attachments list
	if (item.length == 1) {
	// create a new element with new attachment name and cloned size
	link.text(name).append($('span', item).clone());
	// update attachment name element
	item.html(link.html());
	// reset parent's title which may contain the old name
	item.parent().attr('title', '');
	}
	};

	// send remote request to add a new contact
	this.add_contact = function(value)
	{
	if (value)
	this.http_post('addcontact', {_address: value});

	return true;
	};

	// send remote request to search mail or contacts
	this.qsearch = function(value)
	{
	if (value \|\| $(this.gui_objects.qsearchbox).val() \|\| $(this.gui_objects.search_interval).val()) {
	var r, lock = this.set_busy(true, 'searching'),
	url = this.search_params(value),
	action = this.env.action == 'compose' && this.contact_list ? 'search-contacts' : 'search';

	if (this.message_list)
	this.clear_message_list();
	else if (this.contact_list)
	this.list_contacts_clear();

	if (this.env.source)
	url._source = this.env.source;
	if (this.env.group)
	url._gid = this.env.group;

	// reset vars
	this.env.current_page = 1;

	r = this.http_request(action, url, lock);

	this.env.qsearch = {lock: lock, request: r};
	this.enable_command('set-listmode', this.env.threads && (this.env.search_scope \|\| 'base') == 'base');

	return true;
	}

	return false;
	};

	this.continue_search = function(request_id)
	{
	var lock = this.set_busy(true, 'stillsearching');

	setTimeout(function() {
	var url = ref.search_params();
	url._continue = request_id;
	ref.env.qsearch = { lock: lock, request: ref.http_request('search', url, lock) };
	}, 100);
	};

	// build URL params for search
	this.search_params = function(search, filter)
	{
	var n, url = {}, mods_arr = [],
	mods = this.env.search_mods,
	scope = this.env.search_scope \|\| 'base',
	mbox = scope == 'all' ? '*' : this.env.mailbox;

	if (!filter && this.gui_objects.search_filter)
	filter = this.gui_objects.search_filter.value;

	if (!search && this.gui_objects.qsearchbox)
	search = this.gui_objects.qsearchbox.value;

	if (filter)
	url._filter = filter;

	if (this.gui_objects.search_interval)
	url._interval = $(this.gui_objects.search_interval).val();

	if (search) {
	url._q = search;

	if (mods && this.message_list)
	mods = mods[mbox] \|\| mods['*'];

	if (mods) {
	for (n in mods)
	mods_arr.push(n);
	url._headers = mods_arr.join(',');
	}
	}

	if (scope)
	url._scope = scope;
	if (mbox && scope != 'all')
	url._mbox = mbox;

	return url;
	};

	// reset search filter
	this.reset_search_filter = function()
	{
	this.filter_disabled = true;
	if (this.gui_objects.search_filter)
	$(this.gui_objects.search_filter).val('ALL').change();
	this.filter_disabled = false;
	};

	// reset quick-search form
	this.reset_qsearch = function(all)
	{
	if (this.gui_objects.qsearchbox)
	this.gui_objects.qsearchbox.value = '';

	if (this.gui_objects.search_interval)
	$(this.gui_objects.search_interval).val('');

	if (this.env.qsearch)
	this.abort_request(this.env.qsearch);

	if (all) {
	this.env.search_scope = 'base';
	this.reset_search_filter();
	}

	this.env.qsearch = null;
	this.env.search_request = null;
	this.env.search_id = null;
	this.select_all_mode = false;

	this.enable_command('set-listmode', this.env.threads);
	};

	this.set_searchscope = function(scope)
	{
	var old = this.env.search_scope;
	this.env.search_scope = scope;

	// re-send search query with new scope
	if (scope != old && this.env.search_request) {
	if (!this.qsearch(this.gui_objects.qsearchbox.value) && this.env.search_filter && this.env.search_filter != 'ALL')
	this.filter_mailbox(this.env.search_filter);
	if (scope != 'all')
	this.select_folder(this.env.mailbox, '', true);
	}
	};

	this.set_searchinterval = function(interval)
	{
	var old = this.env.search_interval;
	this.env.search_interval = interval;

	// re-send search query with new interval
	if (interval != old && this.env.search_request) {
	if (!this.qsearch(this.gui_objects.qsearchbox.value) && this.env.search_filter && this.env.search_filter != 'ALL')
	this.filter_mailbox(this.env.search_filter);
	if (interval)
	this.select_folder(this.env.mailbox, '', true);
	}
	};

	this.set_searchmods = function(mods)
	{
	var mbox = this.env.mailbox,
	scope = this.env.search_scope \|\| 'base';

	if (scope == 'all')
	mbox = '*';

	if (!this.env.search_mods)
	this.env.search_mods = {};

	if (mbox)
	this.env.search_mods[mbox] = mods;
	};

	this.is_multifolder_listing = function()
	{
	return this.env.multifolder_listing !== undefined ? this.env.multifolder_listing :
	(this.env.search_request && (this.env.search_scope \|\| 'base') != 'base');
	};

	// action executed after mail is sent
	this.sent_successfully = function(type, msg, folders, save_error)
	{
	this.display_message(msg, type);
	this.compose_skip_unsavedcheck = true;

	if (this.env.extwin) {
	if (!save_error)
	this.lock_form(this.gui_objects.messageform);

	var filter = {task: 'mail', action: ''},
	rc = this.opener(false, filter) \|\| this.opener(true, filter);

	if (rc) {
	rc.display_message(msg, type);
	// refresh the folder where sent message was saved or replied message comes from
	if (folders && $.inArray(rc.env.mailbox, folders) >= 0) {
	rc.command('checkmail');
	}
	}

	if (!save_error)
	setTimeout(function() { window.close(); }, 1000);
	}
	else if (!save_error) {
	// before redirect we need to wait some time for Chrome (#1486177)
	setTimeout(function() { ref.list_mailbox(); }, 500);
	}

	if (save_error)
	this.env.is_sent = true;
	};


	/*********************************************************/
	/******* keyboard live-search methods *******/
	/*********************************************************/

	// handler for keyboard events on address-fields
	this.ksearch_keydown = function(e, obj, props)
	{
	if (this.ksearch_timer)
	clearTimeout(this.ksearch_timer);

	var key = rcube_event.get_keycode(e),
	mod = rcube_event.get_modifier(e);

	switch (key) {
	case 38: // arrow up
	case 40: // arrow down
	if (!this.ksearch_visible())
	return;

	var dir = key == 38 ? 1 : 0,
	highlight = document.getElementById('rcmkSearchItem' + this.ksearch_selected);

	if (!highlight)
	highlight = this.ksearch_pane.__ul.firstChild;

	if (highlight)
	this.ksearch_select(dir ? highlight.previousSibling : highlight.nextSibling);

	return rcube_event.cancel(e);

	case 9: // tab
	if (mod == SHIFT_KEY \|\| !this.ksearch_visible()) {
	this.ksearch_hide();
	return;
	}

	case 13: // enter
	if (!this.ksearch_visible())
	return false;

	// insert selected address and hide ksearch pane
	this.insert_recipient(this.ksearch_selected);
	this.ksearch_hide();

	return rcube_event.cancel(e);

	case 27: // escape
	this.ksearch_hide();
	return;

	case 37: // left
	case 39: // right
	return;
	}

	// start timer
	this.ksearch_timer = setTimeout(function(){ ref.ksearch_get_results(props); }, 200);
	this.ksearch_input = obj;

	return true;
	};

	this.ksearch_visible = function()
	{
	return this.ksearch_selected !== null && this.ksearch_selected !== undefined && this.ksearch_value;
	};

	this.ksearch_select = function(node)
	{
	if (this.ksearch_pane && node) {
	this.ksearch_pane.find('li.selected').removeClass('selected').removeAttr('aria-selected');
	}

	if (node) {
	$(node).addClass('selected').attr('aria-selected', 'true');
	this.ksearch_selected = node._rcm_id;
	$(this.ksearch_input).attr('aria-activedescendant', 'rcmkSearchItem' + this.ksearch_selected);
	}
	};

	this.insert_recipient = function(id)
	{
	if (id === null \|\| !this.env.contacts[id] \|\| !this.ksearch_input)
	return;

	// get cursor pos
	var inp_value = this.ksearch_input.value,
	cpos = this.get_caret_pos(this.ksearch_input),
	p = inp_value.lastIndexOf(this.ksearch_value, cpos),
	trigger = false,
	insert = '',
	// replace search string with full address
	pre = inp_value.substring(0, p),
	end = inp_value.substring(p+this.ksearch_value.length, inp_value.length);

	this.ksearch_destroy();

	// insert all members of a group
	if (typeof this.env.contacts[id] === 'object' && this.env.contacts[id].type == 'group' && !this.env.contacts[id].email) {
	insert += this.env.contacts[id].name + this.env.recipients_delimiter;
	this.group2expand[this.env.contacts[id].id] = $.extend({ input: this.ksearch_input }, this.env.contacts[id]);
	this.http_request('mail/group-expand', {_source: this.env.contacts[id].source, _gid: this.env.contacts[id].id}, false);
	}
	else if (typeof this.env.contacts[id] === 'object' && this.env.contacts[id].name) {
	insert = this.env.contacts[id].name + this.env.recipients_delimiter;
	trigger = true;
	}
	else if (typeof this.env.contacts[id] === 'string') {
	insert = this.env.contacts[id] + this.env.recipients_delimiter;
	trigger = true;
	}

	this.ksearch_input.value = pre + insert + end;

	// set caret to insert pos
	this.set_caret_pos(this.ksearch_input, p + insert.length);

	if (trigger) {
	this.triggerEvent('autocomplete_insert', { field:this.ksearch_input, insert:insert, data:this.env.contacts[id], search:this.ksearch_value_last, result_type:'person' });
	this.ksearch_value_last = null;
	this.compose_type_activity++;
	}
	};

	this.replace_group_recipients = function(id, recipients)
	{
	if (this.group2expand[id]) {
	this.group2expand[id].input.value = this.group2expand[id].input.value.replace(this.group2expand[id].name, recipients);
	this.triggerEvent('autocomplete_insert', { field:this.group2expand[id].input, insert:recipients, data:this.group2expand[id], search:this.ksearch_value_last, result_type:'group' });
	this.ksearch_value_last = null;
	this.group2expand[id] = null;
	this.compose_type_activity++;
	}
	};

	// address search processor
	this.ksearch_get_results = function(props)
	{
	var inp_value = this.ksearch_input ? this.ksearch_input.value : null;

	if (inp_value === null)
	return;

	if (this.ksearch_pane && this.ksearch_pane.is(":visible"))
	this.ksearch_pane.hide();

	// get string from current cursor pos to last comma
	var cpos = this.get_caret_pos(this.ksearch_input),
	p = inp_value.lastIndexOf(this.env.recipients_separator, cpos-1),
	q = inp_value.substring(p+1, cpos),
	min = this.env.autocomplete_min_length,
	data = this.ksearch_data;

	// trim query string
	q = $.trim(q);

	// Don't (re-)search if the last results are still active
	if (q == this.ksearch_value)
	return;

	this.ksearch_destroy();

	if (q.length && q.length < min) {
	if (!this.ksearch_info) {
	this.ksearch_info = this.display_message(
	this.get_label('autocompletechars').replace('$min', min));
	}
	return;
	}

	var old_value = this.ksearch_value;
	this.ksearch_value = q;
	this.ksearch_value_last = q; // Group expansion clears ksearch_value before calling autocomplete_insert trigger, therefore store it in separate variable for later consumption.

	// ...string is empty
	if (!q.length)
	return;

	// ...new search value contains old one and previous search was not finished or its result was empty
	if (old_value && old_value.length && q.startsWith(old_value) && (!data \|\| data.num <= 0) && this.env.contacts && !this.env.contacts.length)
	return;

	var sources = props && props.sources ? props.sources : [''];
	var reqid = this.multi_thread_http_request({
	items: sources,
	threads: props && props.threads ? props.threads : 1,
	action: props && props.action ? props.action : 'mail/autocomplete',
	postdata: { _search:q, _source:'%s' },
	lock: this.display_message(this.get_label('searching'), 'loading')
	});

	this.ksearch_data = { id:reqid, sources:sources.slice(), num:sources.length };
	};

	this.ksearch_query_results = function(results, search, reqid)
	{
	// trigger multi-thread http response callback
	this.multi_thread_http_response(results, reqid);

	// search stopped in meantime?
	if (!this.ksearch_value)
	return;

	// ignore this outdated search response
	if (this.ksearch_input && search != this.ksearch_value)
	return;

	// display search results
	var i, id, len, ul, text, type, init,
	value = this.ksearch_value,
	maxlen = this.env.autocomplete_max ? this.env.autocomplete_max : 15;

	// create results pane if not present
	if (!this.ksearch_pane) {
	ul = $('<ul>');
	this.ksearch_pane = $('<div>').attr('id', 'rcmKSearchpane').attr('role', 'listbox')
	.css({ position:'absolute', 'z-index':30000 }).append(ul).appendTo(document.body);
	this.ksearch_pane.__ul = ul[0];
	}

	ul = this.ksearch_pane.__ul;

	// remove all search results or add to existing list if parallel search
	if (reqid && this.ksearch_pane.data('reqid') == reqid) {
	maxlen -= ul.childNodes.length;
	}
	else {
	this.ksearch_pane.data('reqid', reqid);
	init = 1;
	// reset content
	ul.innerHTML = '';
	this.env.contacts = [];
	// move the results pane right under the input box
	var pos = $(this.ksearch_input).offset();
	this.ksearch_pane.css({ left:pos.left+'px', top:(pos.top + this.ksearch_input.offsetHeight)+'px', display: 'none'});
	}

	// add each result line to list
	if (results && (len = results.length)) {
	for (i=0; i < len && maxlen > 0; i++) {
	text = typeof results[i] === 'object' ? (results[i].display \|\| results[i].name) : results[i];
	type = typeof results[i] === 'object' ? results[i].type : '';
	id = i + this.env.contacts.length;
	$('<li>').attr('id', 'rcmkSearchItem' + id)
	.attr('role', 'option')
	.html('<i class="icon"></i>' + this.quote_html(text.replace(new RegExp('('+RegExp.escape(value)+')', 'ig'), '##$1%%')).replace(/##([^%]+)%%/g, '<b>$1</b>'))
	.addClass(type \|\| '')
	.appendTo(ul)
	.mouseover(function() { ref.ksearch_select(this); })
	.mouseup(function() { ref.ksearch_click(this); })
	.get(0)._rcm_id = id;
	maxlen -= 1;
	}
	}

	if (ul.childNodes.length) {
	// set the right aria-* attributes to the input field
	$(this.ksearch_input)
	.attr('aria-haspopup', 'true')
	.attr('aria-expanded', 'true')
	.attr('aria-owns', 'rcmKSearchpane');

	this.ksearch_pane.show();

	// select the first
	if (!this.env.contacts.length) {
	this.ksearch_select($('li:first', ul).get(0));
	}
	}

	if (len)
	this.env.contacts = this.env.contacts.concat(results);

	if (this.ksearch_data.id == reqid)
	this.ksearch_data.num--;
	};

	this.ksearch_click = function(node)
	{
	if (this.ksearch_input)
	this.ksearch_input.focus();

	this.insert_recipient(node._rcm_id);
	this.ksearch_hide();
	};

	this.ksearch_blur = function()
	{
	if (this.ksearch_timer)
	clearTimeout(this.ksearch_timer);

	this.ksearch_input = null;
	this.ksearch_hide();
	};

	this.ksearch_hide = function()
	{
	this.ksearch_selected = null;
	this.ksearch_value = '';

	if (this.ksearch_pane)
	this.ksearch_pane.hide();

	$(this.ksearch_input)
	.attr('aria-haspopup', 'false')
	.attr('aria-expanded', 'false')
	.removeAttr('aria-activedescendant')
	.removeAttr('aria-owns');

	this.ksearch_destroy();
	};

	// Clears autocomplete data/requests
	this.ksearch_destroy = function()
	{
	if (this.ksearch_data)
	this.multi_thread_request_abort(this.ksearch_data.id);

	if (this.ksearch_info)
	this.hide_message(this.ksearch_info);

	if (this.ksearch_msg)
	this.hide_message(this.ksearch_msg);

	this.ksearch_data = null;
	this.ksearch_info = null;
	this.ksearch_msg = null;
	};


	/*********************************************************/
	/******* address book methods *******/
	/*********************************************************/

	this.contactlist_keypress = function(list)
	{
	if (list.key_pressed == list.DELETE_KEY)
	this.command('delete');
	};

	this.contactlist_select = function(list)
	{
	if (this.preview_timer)
	clearTimeout(this.preview_timer);

	var n, id, sid, contact, writable = false,
	selected = list.selection.length,
	source = this.env.source ? this.env.address_sources[this.env.source] : null;

	// we don't have dblclick handler here, so use 200 instead of this.dblclick_time
	if (this.env.contentframe && (id = list.get_single_selection()))
	this.preview_timer = setTimeout(function(){ ref.load_contact(id, 'show'); }, 200);
	else if (this.env.contentframe)
	this.show_contentframe(false);

	if (selected) {
	list.draggable = false;

	// no source = search result, we'll need to detect if any of
	// selected contacts are in writable addressbook to enable edit/delete
	// we'll also need to know sources used in selection for copy
	// and group-addmember operations (drag&drop)
	this.env.selection_sources = [];

	if (source) {
	this.env.selection_sources.push(this.env.source);
	}

	for (n in list.selection) {
	contact = list.data[list.selection[n]];
	if (!source) {
	sid = String(list.selection[n]).replace(/^[^-]+-/, '');
	if (sid && this.env.address_sources[sid]) {
	writable = writable \|\| (!this.env.address_sources[sid].readonly && !contact.readonly);
	this.env.selection_sources.push(sid);
	}
	}
	else {
	writable = writable \|\| (!source.readonly && !contact.readonly);
	}

	if (contact._type != 'group')
	list.draggable = true;
	}

	this.env.selection_sources = $.unique(this.env.selection_sources);
	}

	// if a group is currently selected, and there is at least one contact selected
	// thend we can enable the group-remove-selected command
	this.enable_command('group-remove-selected', this.env.group && selected && writable);
	this.enable_command('compose', this.env.group \|\| selected);
	this.enable_command('print', selected == 1);
	this.enable_command('export-selected', 'copy', selected > 0);
	this.enable_command('edit', id && writable);
	this.enable_command('delete', 'move', selected && writable);

	return false;
	};

	this.list_contacts = function(src, group, page, search)
	{
	var win, folder, index = -1, url = {},
	refresh = src === undefined && group === undefined && page === undefined,
	target = window;

	if (!src)
	src = this.env.source;

	if (refresh)
	group = this.env.group;

	if (src != this.env.source) {
	page = this.env.current_page = 1;
	this.reset_qsearch();
	}
	else if (!refresh && group != this.env.group)
	page = this.env.current_page = 1;

	if (this.env.search_id)
	folder = 'S'+this.env.search_id;
	else if (!this.env.search_request)
	folder = group ? 'G'+src+group : src;

	this.env.source = src;
	this.env.group = group;

	// truncate groups listing stack
	$.each(this.env.address_group_stack, function(i, v) {
	if (ref.env.group == v.id) {
	index = i;
	return false;
	}
	});

	this.env.address_group_stack = index < 0 ? [] : this.env.address_group_stack.slice(0, index);

	// make sure the current group is on top of the stack
	if (this.env.group) {
	if (!search) search = {};
	search.id = this.env.group;
	this.env.address_group_stack.push(search);

	// mark the first group on the stack as selected in the directory list
	folder = 'G'+src+this.env.address_group_stack[0].id;
	}
	else if (this.gui_objects.addresslist_title) {
	$(this.gui_objects.addresslist_title).text(this.get_label('contacts'));
	}

	if (!this.env.search_id)
	this.select_folder(folder, '', true);

	// load contacts remotely
	if (this.gui_objects.contactslist) {
	this.list_contacts_remote(src, group, page);
	return;
	}

	if (win = this.get_frame_window(this.env.contentframe)) {
	target = win;
	url._framed = 1;
	}

	if (group)
	url._gid = group;
	if (page)
	url._page = page;
	if (src)
	url._source = src;

	// also send search request to get the correct listing
	if (this.env.search_request)
	url._search = this.env.search_request;

	this.set_busy(true, 'loading');
	this.location_href(url, target);
	};

	// send remote request to load contacts list
	this.list_contacts_remote = function(src, group, page)
	{
	// clear message list first
	this.list_contacts_clear();

	// send request to server
	var url = {}, lock = this.set_busy(true, 'loading');

	if (src)
	url._source = src;
	if (page)
	url._page = page;
	if (group)
	url._gid = group;

	this.env.source = src;
	this.env.group = group;

	// also send search request to get the right records
	if (this.env.search_request)
	url._search = this.env.search_request;

	this.http_request(this.env.task == 'mail' ? 'list-contacts' : 'list', url, lock);
	};

	this.list_contacts_clear = function()
	{
	this.contact_list.data = {};
	this.contact_list.clear(true);
	this.show_contentframe(false);
	this.enable_command('delete', 'move', 'copy', 'print', false);
	this.enable_command('compose', this.env.group);
	};

	this.set_group_prop = function(prop)
	{
	if (this.gui_objects.addresslist_title) {
	var boxtitle = $(this.gui_objects.addresslist_title).html(''); // clear contents

	// add link to pop back to parent group
	if (this.env.address_group_stack.length > 1
	\|\| (this.env.address_group_stack.length == 1 && this.env.address_group_stack[0].search_request)
	) {
	$('<a href="#list">...</a>')
	.attr('title', this.get_label('uponelevel'))
	.addClass('poplink')
	.appendTo(boxtitle)
	.click(function(e){ return ref.command('popgroup','',this); });
	boxtitle.append(' » ');
	}

	boxtitle.append($('<span>').text(prop ? prop.name : this.get_label('contacts')));
	}

	if (prop)
	this.triggerEvent('groupupdate', prop);
	};

	// load contact record
	this.load_contact = function(cid, action, framed)
	{
	var win, url = {}, target = window,
	rec = this.contact_list ? this.contact_list.data[cid] : null;

	if (win = this.get_frame_window(this.env.contentframe)) {
	url._framed = 1;
	target = win;
	this.show_contentframe(true);

	// load dummy content, unselect selected row(s)
	if (!cid)
	this.contact_list.clear_selection();

	this.enable_command('compose', rec && rec.email);
	this.enable_command('export-selected', 'print', rec && rec._type != 'group');
	}
	else if (framed)
	return false;

	if (action && (cid \|\| action == 'add') && !this.drag_active) {
	if (this.env.group)
	url._gid = this.env.group;

	if (this.env.search_request)
	url._search = this.env.search_request;

	url._action = action;
	url._source = this.env.source;
	url._cid = cid;

	this.location_href(url, target, true);
	}

	return true;
	};

	// add/delete member to/from the group
	this.group_member_change = function(what, cid, source, gid)
	{
	if (what != 'add')
	what = 'del';

	var label = this.get_label(what == 'add' ? 'addingmember' : 'removingmember'),
	lock = this.display_message(label, 'loading'),
	post_data = {_cid: cid, _source: source, _gid: gid};

	this.http_post('group-'+what+'members', post_data, lock);
	};

	this.contacts_drag_menu = function(e, to)
	{
	var dest = to.type == 'group' ? to.source : to.id,
	source = this.env.source;

	if (!this.env.address_sources[dest] \|\| this.env.address_sources[dest].readonly)
	return true;

	// search result may contain contacts from many sources, but if there is only one...
	if (source == '' && this.env.selection_sources.length == 1)
	source = this.env.selection_sources[0];

	if (to.type == 'group' && dest == source) {
	var cid = this.contact_list.get_selection().join(',');
	this.group_member_change('add', cid, dest, to.id);
	return true;
	}
	// move action is not possible, "redirect" to copy if menu wasn't requested
	else if (!this.commands.move && rcube_event.get_modifier(e) != SHIFT_KEY) {
	this.copy_contacts(to);
	return true;
	}

	return this.drag_menu(e, to);
	};

	// copy contact(s) to the specified target (group or directory)
	this.copy_contacts = function(to)
	{
	var dest = to.type == 'group' ? to.source : to.id,
	source = this.env.source,
	group = this.env.group ? this.env.group : '',
	cid = this.contact_list.get_selection().join(',');

	if (!cid \|\| !this.env.address_sources[dest] \|\| this.env.address_sources[dest].readonly)
	return;

	// search result may contain contacts from many sources, but if there is only one...
	if (source == '' && this.env.selection_sources.length == 1)
	source = this.env.selection_sources[0];

	// tagret is a group
	if (to.type == 'group') {
	if (dest == source)
	return;

	var lock = this.display_message(this.get_label('copyingcontact'), 'loading'),
	post_data = {_cid: cid, _source: this.env.source, _to: dest, _togid: to.id, _gid: group};

	this.http_post('copy', post_data, lock);
	}
	// target is an addressbook
	else if (to.id != source) {
	var lock = this.display_message(this.get_label('copyingcontact'), 'loading'),
	post_data = {_cid: cid, _source: this.env.source, _to: to.id, _gid: group};

	this.http_post('copy', post_data, lock);
	}
	};

	// move contact(s) to the specified target (group or directory)
	this.move_contacts = function(to)
	{
	var dest = to.type == 'group' ? to.source : to.id,
	source = this.env.source,
	group = this.env.group ? this.env.group : '';

	if (!this.env.address_sources[dest] \|\| this.env.address_sources[dest].readonly)
	return;

	// search result may contain contacts from many sources, but if there is only one...
	if (source == '' && this.env.selection_sources.length == 1)
	source = this.env.selection_sources[0];

	if (to.type == 'group') {
	if (dest == source)
	return;

	this._with_selected_contacts('move', {_to: dest, _togid: to.id});
	}
	// target is an addressbook
	else if (to.id != source)
	this._with_selected_contacts('move', {_to: to.id});
	};

	// delete contact(s)
	this.delete_contacts = function()
	{
	var undelete = this.env.source && this.env.address_sources[this.env.source].undelete;

	if (!undelete && !confirm(this.get_label('deletecontactconfirm')))
	return;

	return this._with_selected_contacts('delete');
	};

	this._with_selected_contacts = function(action, post_data)
	{
	var selection = this.contact_list ? this.contact_list.get_selection() : [];

	// exit if no contact specified or if selection is empty
	if (!selection.length && !this.env.cid)
	return;

	var n, a_cids = [],
	label = action == 'delete' ? 'contactdeleting' : 'movingcontact',
	lock = this.display_message(this.get_label(label), 'loading');

	if (this.env.cid)
	a_cids.push(this.env.cid);
	else {
	for (n=0; n<selection.length; n++) {
	id = selection[n];
	a_cids.push(id);
	this.contact_list.remove_row(id, (n == selection.length-1));
	}

	// hide content frame if we delete the currently displayed contact
	if (selection.length == 1)
	this.show_contentframe(false);
	}

	if (!post_data)
	post_data = {};

	post_data._source = this.env.source;
	post_data._from = this.env.action;
	post_data._cid = a_cids.join(',');

	if (this.env.group)
	post_data._gid = this.env.group;

	// also send search request to get the right records from the next page
	if (this.env.search_request)
	post_data._search = this.env.search_request;

	// send request to server
	this.http_post(action, post_data, lock)

	return true;
	};

	// update a contact record in the list
	this.update_contact_row = function(cid, cols_arr, newcid, source, data)
	{
	var list = this.contact_list;

	cid = this.html_identifier(cid);

	// when in searching mode, concat cid with the source name
	if (!list.rows[cid]) {
	cid = cid + '-' + source;
	if (newcid)
	newcid = newcid + '-' + source;
	}

	list.update_row(cid, cols_arr, newcid, true);
	list.data[cid] = data;
	};

	// add row to contacts list
	this.add_contact_row = function(cid, cols, classes, data)
	{
	if (!this.gui_objects.contactslist)
	return false;

	var c, col, list = this.contact_list,
	row = { cols:[] };

	row.id = 'rcmrow' + this.html_identifier(cid);
	row.className = 'contact ' + (classes \|\| '');

	if (list.in_selection(cid))
	row.className += ' selected';

	// add each submitted col
	for (c in cols) {
	col = {};
	col.className = String(c).toLowerCase();
	col.innerHTML = cols[c];
	row.cols.push(col);
	}

	// store data in list member
	list.data[cid] = data;
	list.insert_row(row);

	this.enable_command('export', list.rowcount > 0);
	};

	this.init_contact_form = function()
	{
	var col;

	if (this.env.coltypes) {
	this.set_photo_actions($('#ff_photo').val());
	for (col in this.env.coltypes)
	this.init_edit_field(col, null);
	}

	$('.contactfieldgroup .row a.deletebutton').click(function() {
	ref.delete_edit_field(this);
	return false;
	});

	$('select.addfieldmenu').change(function() {
	ref.insert_edit_field($(this).val(), $(this).attr('rel'), this);
	this.selectedIndex = 0;
	});

	// enable date pickers on date fields
	if ($.datepicker && this.env.date_format) {
	$.datepicker.setDefaults({
	dateFormat: this.env.date_format,
	changeMonth: true,
	changeYear: true,
	yearRange: '-120:+10',
	showOtherMonths: true,
	selectOtherMonths: true
	// onSelect: function(dateText) { $(this).focus().val(dateText); }
	});
	$('input.datepicker').datepicker();
	}

	// Submit search form on Enter
	if (this.env.action == 'search')
	$(this.gui_objects.editform).append($('<input type="submit">').hide())
	.submit(function() { $('input.mainaction').click(); return false; });
	};

	// group creation dialog
	this.group_create = function()
	{
	var input = $('<input>').attr('type', 'text'),
	content = $('<label>').text(this.get_label('namex')).append(input);

	this.simple_dialog(content, 'newgroup',
	function() {
	var name;
	if (name = input.val()) {
	ref.http_post('group-create', {_source: ref.env.source, _name: name},
	ref.set_busy(true, 'loading'));
	return true;
	}
	});
	};

	// group rename dialog
	this.group_rename = function()
	{
	if (!this.env.group)
	return;

	var group_name = this.env.contactgroups['G' + this.env.source + this.env.group].name,
	input = $('<input>').attr('type', 'text').val(group_name),
	content = $('<label>').text(this.get_label('namex')).append(input);

	this.simple_dialog(content, 'grouprename',
	function() {
	var name;
	if ((name = input.val()) && name != group_name) {
	ref.http_post('group-rename', {_source: ref.env.source, _gid: ref.env.group, _name: name},
	ref.set_busy(true, 'loading'));
	return true;
	}
	},
	{open: function() { input.select(); }}
	);
	};

	this.group_delete = function()
	{
	if (this.env.group && confirm(this.get_label('deletegroupconfirm'))) {
	var lock = this.set_busy(true, 'groupdeleting');
	this.http_post('group-delete', {_source: this.env.source, _gid: this.env.group}, lock);
	}
	};

	// callback from server upon group-delete command
	this.remove_group_item = function(prop)
	{
	var key = 'G'+prop.source+prop.id;

	if (this.treelist.remove(key)) {
	this.triggerEvent('group_delete', { source:prop.source, id:prop.id });
	delete this.env.contactfolders[key];
	delete this.env.contactgroups[key];
	}

	this.list_contacts(prop.source, 0);
	};

	//remove selected contacts from current active group
	this.group_remove_selected = function()
	{
	this.http_post('group-delmembers', {_cid: this.contact_list.selection,
	_source: this.env.source, _gid: this.env.group});
	};

	//callback after deleting contact(s) from current group
	this.remove_group_contacts = function(props)
	{
	if (this.env.group !== undefined && (this.env.group === props.gid)) {
	var n, selection = this.contact_list.get_selection();
	for (n=0; n<selection.length; n++) {
	id = selection[n];
	this.contact_list.remove_row(id, (n == selection.length-1));
	}
	}
	};

	// callback for creating a new contact group
	this.insert_contact_group = function(prop)
	{
	prop.type = 'group';

	var key = 'G'+prop.source+prop.id,
	link = $('<a>').attr('href', '#')
	.attr('rel', prop.source+':'+prop.id)
	.click(function() { return ref.command('listgroup', prop, this); })
	.html(prop.name);

	this.env.contactfolders[key] = this.env.contactgroups[key] = prop;
	this.treelist.insert({ id:key, html:link, classes:['contactgroup'] }, prop.source, 'contactgroup');

	this.triggerEvent('group_insert', { id:prop.id, source:prop.source, name:prop.name, li:this.treelist.get_item(key) });
	};

	// callback for renaming a contact group
	this.update_contact_group = function(prop)
	{
	var key = 'G'+prop.source+prop.id,
	newnode = {};

	// group ID has changed, replace link node and identifiers
	if (prop.newid) {
	var newkey = 'G'+prop.source+prop.newid,
	newprop = $.extend({}, prop);

	this.env.contactfolders[newkey] = this.env.contactfolders[key];
	this.env.contactfolders[newkey].id = prop.newid;
	this.env.group = prop.newid;

	delete this.env.contactfolders[key];
	delete this.env.contactgroups[key];

	newprop.id = prop.newid;
	newprop.type = 'group';

	newnode.id = newkey;
	newnode.html = $('<a>').attr('href', '#')
	.attr('rel', prop.source+':'+prop.newid)
	.click(function() { return ref.command('listgroup', newprop, this); })
	.html(prop.name);
	}
	// update displayed group name
	else {
	$(this.treelist.get_item(key)).children().first().html(prop.name);
	this.env.contactfolders[key].name = this.env.contactgroups[key].name = prop.name;
	}

	// update list node and re-sort it
	this.treelist.update(key, newnode, true);

	this.triggerEvent('group_update', { id:prop.id, source:prop.source, name:prop.name, li:this.treelist.get_item(key), newid:prop.newid });
	};

	this.update_group_commands = function()
	{
	var source = this.env.source != '' ? this.env.address_sources[this.env.source] : null,
	supported = source && source.groups && !source.readonly;

	this.enable_command('group-create', supported);
	this.enable_command('group-rename', 'group-delete', supported && this.env.group);
	};

	this.init_edit_field = function(col, elem)
	{
	var label = this.env.coltypes[col].label;

	if (!elem)
	elem = $('.ff_' + col);

	if (label)
	elem.placeholder(label);
	};

	this.insert_edit_field = function(col, section, menu)
	{
	// just make pre-defined input field visible
	var elem = $('#ff_'+col);
	if (elem.length) {
	elem.show().focus();
	$(menu).children('option[value="'+col+'"]').prop('disabled', true);
	}
	else {
	var lastelem = $('.ff_'+col),
	appendcontainer = $('#contactsection'+section+' .contactcontroller'+col);

	if (!appendcontainer.length) {
	var sect = $('#contactsection'+section),
	lastgroup = $('.contactfieldgroup', sect).last();
	appendcontainer = $('<fieldset>').addClass('contactfieldgroup contactcontroller'+col);
	if (lastgroup.length)
	appendcontainer.insertAfter(lastgroup);
	else
	sect.prepend(appendcontainer);
	}

	if (appendcontainer.length && appendcontainer.get(0).nodeName == 'FIELDSET') {
	var input, colprop = this.env.coltypes[col],
	input_id = 'ff_' + col + (colprop.count \|\| 0),
	row = $('<div>').addClass('row'),
	cell = $('<div>').addClass('contactfieldcontent data'),
	label = $('<div>').addClass('contactfieldlabel label');

	if (colprop.subtypes_select)
	label.html(colprop.subtypes_select);
	else
	label.html('<label for="' + input_id + '">' + colprop.label + '</label>');

	var name_suffix = colprop.limit != 1 ? '[]' : '';

	if (colprop.type == 'text' \|\| colprop.type == 'date') {
	input = $('<input>')
	.addClass('ff_'+col)
	.attr({type: 'text', name: '_'+col+name_suffix, size: colprop.size, id: input_id})
	.appendTo(cell);

	this.init_edit_field(col, input);

	if (colprop.type == 'date' && $.datepicker)
	input.datepicker();
	}
	else if (colprop.type == 'textarea') {
	input = $('<textarea>')
	.addClass('ff_'+col)
	.attr({ name: '_'+col+name_suffix, cols:colprop.size, rows:colprop.rows, id: input_id })
	.appendTo(cell);

	this.init_edit_field(col, input);
	}
	else if (colprop.type == 'composite') {
	var i, childcol, cp, first, templ, cols = [], suffices = [];

	// read template for composite field order
	if ((templ = this.env[col+'_template'])) {
	for (i=0; i < templ.length; i++) {
	cols.push(templ[i][1]);
	suffices.push(templ[i][2]);
	}
	}
	else { // list fields according to appearance in colprop
	for (childcol in colprop.childs)
	cols.push(childcol);
	}

	for (i=0; i < cols.length; i++) {
	childcol = cols[i];
	cp = colprop.childs[childcol];
	input = $('<input>')
	.addClass('ff_'+childcol)
	.attr({ type: 'text', name: '_'+childcol+name_suffix, size: cp.size })
	.appendTo(cell);
	cell.append(suffices[i] \|\| " ");
	this.init_edit_field(childcol, input);
	if (!first) first = input;
	}
	input = first; // set focus to the first of this composite fields
	}
	else if (colprop.type == 'select') {
	input = $('<select>')
	.addClass('ff_'+col)
	.attr({ 'name': '_'+col+name_suffix, id: input_id })
	.appendTo(cell);

	var options = input.attr('options');
	options[options.length] = new Option('---', '');
	if (colprop.options)
	$.each(colprop.options, function(i, val){ options[options.length] = new Option(val, i); });
	}

	if (input) {
	var delbutton = $('<a href="#del"></a>')
	.addClass('contactfieldbutton deletebutton')
	.attr({title: this.get_label('delete'), rel: col})
	.html(this.env.delbutton)
	.click(function(){ ref.delete_edit_field(this); return false })
	.appendTo(cell);

	row.append(label).append(cell).appendTo(appendcontainer.show());
	input.first().focus();

	// disable option if limit reached
	if (!colprop.count) colprop.count = 0;
	if (++colprop.count == colprop.limit && colprop.limit)
	$(menu).children('option[value="'+col+'"]').prop('disabled', true);
	}
	}
	}
	};

	this.delete_edit_field = function(elem)
	{
	var col = $(elem).attr('rel'),
	colprop = this.env.coltypes[col],
	fieldset = $(elem).parents('fieldset.contactfieldgroup'),
	addmenu = fieldset.parent().find('select.addfieldmenu');

	// just clear input but don't hide the last field
	if (--colprop.count <= 0 && colprop.visible)
	$(elem).parent().children('input').val('').blur();
	else {
	$(elem).parents('div.row').remove();
	// hide entire fieldset if no more rows
	if (!fieldset.children('div.row').length)
	fieldset.hide();
	}

	// enable option in add-field selector or insert it if necessary
	if (addmenu.length) {
	var option = addmenu.children('option[value="'+col+'"]');
	if (option.length)
	option.prop('disabled', false);
	else
	option = $('<option>').attr('value', col).html(colprop.label).appendTo(addmenu);
	addmenu.show();
	}
	};

	this.upload_contact_photo = function(form)
	{
	if (form && form.elements._photo.value) {
	this.async_upload_form(form, 'upload-photo', function(e) {
	ref.set_busy(false, null, ref.file_upload_id);
	});

	// display upload indicator
	this.file_upload_id = this.set_busy(true, 'uploading');
	}
	};

	this.replace_contact_photo = function(id)
	{
	var img_src = id == '-del-' ? this.env.photo_placeholder :
	this.env.comm_path + '&_action=photo&_source=' + this.env.source + '&_cid=' + (this.env.cid \|\| 0) + '&_photo=' + id;

	this.set_photo_actions(id);
	$(this.gui_objects.contactphoto).children('img').attr('src', img_src);
	};

	this.photo_upload_end = function()
	{
	this.set_busy(false, null, this.file_upload_id);
	delete this.file_upload_id;
	};

	this.set_photo_actions = function(id)
	{
	var n, buttons = this.buttons['upload-photo'];
	for (n=0; buttons && n < buttons.length; n++)
	$('a#'+buttons[n].id).html(this.get_label(id == '-del-' ? 'addphoto' : 'replacephoto'));

	$('#ff_photo').val(id);
	this.enable_command('upload-photo', this.env.coltypes.photo ? true : false);
	this.enable_command('delete-photo', this.env.coltypes.photo && id != '-del-');
	};

	// load advanced search page
	this.advanced_search = function()
	{
	var win, url = {_form: 1, _action: 'search'}, target = window;

	if (win = this.get_frame_window(this.env.contentframe)) {
	url._framed = 1;
	target = win;
	this.contact_list.clear_selection();
	}

	this.location_href(url, target, true);

	return true;
	};

	// unselect directory/group
	this.unselect_directory = function()
	{
	this.select_folder('');
	this.enable_command('search-delete', false);
	};

	// callback for creating a new saved search record
	this.insert_saved_search = function(name, id)
	{
	var key = 'S'+id,
	link = $('<a>').attr('href', '#')
	.attr('rel', id)
	.click(function() { return ref.command('listsearch', id, this); })
	.html(name),
	prop = { name:name, id:id };

	this.savedsearchlist.insert({ id:key, html:link, classes:['contactsearch'] }, null, 'contactsearch');
	this.select_folder(key,'',true);
	this.enable_command('search-delete', true);
	this.env.search_id = id;

	this.triggerEvent('abook_search_insert', prop);
	};

	// creates a dialog for saved search
	this.search_create = function()
	{
	var input = $('<input>').attr('type', 'text'),
	content = $('<label>').text(this.get_label('namex')).append(input);

	this.simple_dialog(content, 'searchsave',
	function() {
	var name;
	if (name = input.val()) {
	ref.http_post('search-create', {_search: ref.env.search_request, _name: name},
	ref.set_busy(true, 'loading'));
	return true;
	}
	}
	);
	};

	this.search_delete = function()
	{
	if (this.env.search_request) {
	var lock = this.set_busy(true, 'savedsearchdeleting');
	this.http_post('search-delete', {_sid: this.env.search_id}, lock);
	}
	};

	// callback from server upon search-delete command
	this.remove_search_item = function(id)
	{
	var li, key = 'S'+id;
	if (this.savedsearchlist.remove(key)) {
	this.triggerEvent('search_delete', { id:id, li:li });
	}

	this.env.search_id = null;
	this.env.search_request = null;
	this.list_contacts_clear();
	this.reset_qsearch();
	this.enable_command('search-delete', 'search-create', false);
	};

	this.listsearch = function(id)
	{
	var lock = this.set_busy(true, 'searching');

	if (this.contact_list) {
	this.list_contacts_clear();
	}

	this.reset_qsearch();

	if (this.savedsearchlist) {
	this.treelist.select('');
	this.savedsearchlist.select('S'+id);
	}
	else
	this.select_folder('S'+id, '', true);

	// reset vars
	this.env.current_page = 1;
	this.http_request('search', {_sid: id}, lock);
	};


	/*********************************************************/
	/******* user settings methods *******/
	/*********************************************************/

	// preferences section select and load options frame
	this.section_select = function(list)
	{
	var win, id = list.get_single_selection(), target = window,
	url = {_action: 'edit-prefs', _section: id};

	if (id) {
	if (win = this.get_frame_window(this.env.contentframe)) {
	url._framed = 1;
	target = win;
	}
	this.location_href(url, target, true);
	}

	return true;
	};

	this.identity_select = function(list)
	{
	var id;
	if (id = list.get_single_selection()) {
	this.enable_command('delete', list.rowcount > 1 && this.env.identities_level < 2);
	this.load_identity(id, 'edit-identity');
	}
	};

	// load identity record
	this.load_identity = function(id, action)
	{
	if (action == 'edit-identity' && (!id \|\| id == this.env.iid))
	return false;

	var win, target = window,
	url = {_action: action, _iid: id};

	if (win = this.get_frame_window(this.env.contentframe)) {
	url._framed = 1;
	target = win;
	}

	if (id \|\| action == 'add-identity') {
	this.location_href(url, target, true);
	}

	return true;
	};

	this.delete_identity = function(id)
	{
	// exit if no identity is specified or if selection is empty
	var selection = this.identity_list.get_selection();
	if (!(selection.length \|\| this.env.iid))
	return;

	if (!id)
	id = this.env.iid ? this.env.iid : selection[0];

	// submit request with appended token
	if (id && confirm(this.get_label('deleteidentityconfirm')))
	this.http_post('settings/delete-identity', { _iid: id }, true);
	};

	this.update_identity_row = function(id, name, add)
	{
	var list = this.identity_list,
	rid = this.html_identifier(id);

	if (add) {
	list.insert_row({ id:'rcmrow'+rid, cols:[ { className:'mail', innerHTML:name } ] });
	list.select(rid);
	}
	else {
	list.update_row(rid, [ name ]);
	}
	};

	this.update_response_row = function(response, oldkey)
	{
	var list = this.responses_list;

	if (list && oldkey) {
	list.update_row(oldkey, [ response.name ], response.key, true);
	}
	else if (list) {
	list.insert_row({ id:'rcmrow'+response.key, cols:[ { className:'name', innerHTML:response.name } ] });
	list.select(response.key);
	}
	};

	this.remove_response = function(key)
	{
	var frame;

	if (this.env.textresponses) {
	delete this.env.textresponses[key];
	}

	if (this.responses_list) {
	this.responses_list.remove_row(key);
	if (this.env.contentframe && (frame = this.get_frame_window(this.env.contentframe))) {
	frame.location.href = this.env.blankpage;
	}
	}

	this.enable_command('delete', false);
	};

	this.remove_identity = function(id)
	{
	var frame, list = this.identity_list,
	rid = this.html_identifier(id);

	if (list && id) {
	list.remove_row(rid);
	if (this.env.contentframe && (frame = this.get_frame_window(this.env.contentframe))) {
	frame.location.href = this.env.blankpage;
	}
	}

	this.enable_command('delete', false);
	};


	/*********************************************************/
	/******* folder manager methods *******/
	/*********************************************************/

	this.init_subscription_list = function()
	{
	var delim = RegExp.escape(this.env.delimiter);

	this.last_sub_rx = RegExp('['+delim+']?[^'+delim+']+$');

	this.subscription_list = new rcube_treelist_widget(this.gui_objects.subscriptionlist, {
	selectable: true,
	tabexit: false,
	parent_focus: true,
	id_prefix: 'rcmli',
	id_encode: this.html_identifier_encode,
	id_decode: this.html_identifier_decode,
	searchbox: '#foldersearch'
	});

	this.subscription_list
	.addEventListener('select', function(node) { ref.subscription_select(node.id); })
	.addEventListener('collapse', function(node) { ref.folder_collapsed(node) })
	.addEventListener('expand', function(node) { ref.folder_collapsed(node) })
	.addEventListener('search', function(p) { if (p.query) ref.subscription_select(); })
	.draggable({cancel: 'li.mailbox.root'})
	.droppable({
	// @todo: find better way, accept callback is executed for every folder
	// on the list when dragging starts (and stops), this is slow, but
	// I didn't find a method to check droptarget on over event
	accept: function(node) {
	if (!$(node).is('.mailbox'))
	return false;

	var source_folder = ref.folder_id2name($(node).attr('id')),
	dest_folder = ref.folder_id2name(this.id),
	source = ref.env.subscriptionrows[source_folder],
	dest = ref.env.subscriptionrows[dest_folder];

	return source && !source[2]
	&& dest_folder != source_folder.replace(ref.last_sub_rx, '')
	&& !dest_folder.startsWith(source_folder + ref.env.delimiter);
	},
	drop: function(e, ui) {
	var source = ref.folder_id2name(ui.draggable.attr('id')),
	dest = ref.folder_id2name(this.id);

	ref.subscription_move_folder(source, dest);
	}
	});
	};

	this.folder_id2name = function(id)
	{
	return id ? ref.html_identifier_decode(id.replace(/^rcmli/, '')) : null;
	};

	this.subscription_select = function(id)
	{
	var folder;

	if (id && id != '*' && (folder = this.env.subscriptionrows[id])) {
	this.env.mailbox = id;
	this.show_folder(id);
	this.enable_command('delete-folder', !folder[2]);
	}
	else {
	this.env.mailbox = null;
	this.show_contentframe(false);
	this.enable_command('delete-folder', 'purge', false);
	}
	};

	this.subscription_move_folder = function(from, to)
	{
	if (from && to !== null && from != to && to != from.replace(this.last_sub_rx, '')) {
	var path = from.split(this.env.delimiter),
	basename = path.pop(),
	newname = to === '' \|\| to === '*' ? basename : to + this.env.delimiter + basename;

	if (newname != from) {
	this.http_post('rename-folder', {_folder_oldname: from, _folder_newname: newname},
	this.set_busy(true, 'foldermoving'));
	}
	}
	};

	// tell server to create and subscribe a new mailbox
	this.create_folder = function()
	{
	this.show_folder('', this.env.mailbox);
	};

	// delete a specific mailbox with all its messages
	this.delete_folder = function(name)
	{
	if (!name)
	name = this.env.mailbox;

	if (name && confirm(this.get_label('deletefolderconfirm'))) {
	this.http_post('delete-folder', {_mbox: name}, this.set_busy(true, 'folderdeleting'));
	}
	};

	// Add folder row to the table and initialize it
	this.add_folder_row = function (id, name, display_name, is_protected, subscribed, class_name, refrow, subfolders)
	{
	if (!this.gui_objects.subscriptionlist)
	return false;

	// reset searching
	if (this.subscription_list.is_search()) {
	this.subscription_select();
	this.subscription_list.reset_search();
	}

	// disable drag-n-drop temporarily
	this.subscription_list.draggable('destroy').droppable('destroy');

	var row, n, tmp, tmp_name, rowid, collator, pos, p, parent = '',
	folders = [], list = [], slist = [],
	list_element = $(this.gui_objects.subscriptionlist);
	row = refrow ? refrow : $($('li', list_element).get(1)).clone(true);

	if (!row.length) {
	// Refresh page if we don't have a table row to clone
	this.goto_url('folders');
	return false;
	}

	// set ID, reset css class
	row.attr({id: 'rcmli' + this.html_identifier_encode(id), 'class': class_name});

	if (!refrow \|\| !refrow.length) {
	// remove old data, subfolders and toggle
	$('ul,div.treetoggle', row).remove();
	row.removeData('filtered');
	}

	// set folder name
	$('a:first', row).text(display_name);

	// update subscription checkbox
	$('input[name="_subscribed[]"]:first', row).val(id)
	.prop({checked: subscribed ? true : false, disabled: is_protected ? true : false});

	// add to folder/row-ID map
	this.env.subscriptionrows[id] = [name, display_name, false];

	// copy folders data to an array for sorting
	$.each(this.env.subscriptionrows, function(k, v) { v[3] = k; folders.push(v); });

	try {
	// use collator if supported (FF29, IE11, Opera15, Chrome24)
	collator = new Intl.Collator(this.env.locale.replace('_', '-'));
	}
	catch (e) {};

	// sort folders
	folders.sort(function(a, b) {
	var i, f1, f2,
	path1 = a[0].split(ref.env.delimiter),
	path2 = b[0].split(ref.env.delimiter),
	len = path1.length;

	for (i=0; i<len; i++) {
	f1 = path1[i];
	f2 = path2[i];

	if (f1 !== f2) {
	if (f2 === undefined)
	return 1;
	if (collator)
	return collator.compare(f1, f2);
	else
	return f1 < f2 ? -1 : 1;
	}
	else if (i == len-1) {
	return -1
	}
	}
	});

	for (n in folders) {
	p = folders[n][3];
	// protected folder
	if (folders[n][2]) {
	tmp_name = p + this.env.delimiter;
	// prefix namespace cannot have subfolders (#1488349)
	if (tmp_name == this.env.prefix_ns)
	continue;
	slist.push(p);
	tmp = tmp_name;
	}
	// protected folder's child
	else if (tmp && p.startsWith(tmp))
	slist.push(p);
	// other
	else {
	list.push(p);
	tmp = null;
	}
	}

	// check if subfolder of a protected folder
	for (n=0; n<slist.length; n++) {
	if (id.startsWith(slist[n] + this.env.delimiter))
	rowid = slist[n];
	}

	// find folder position after sorting
	for (n=0; !rowid && n<list.length; n++) {
	if (n && list[n] == id)
	rowid = list[n-1];
	}

	// add row to the table
	if (rowid && (n = this.subscription_list.get_item(rowid, true))) {
	// find parent folder
	if (pos = id.lastIndexOf(this.env.delimiter)) {
	parent = id.substring(0, pos);
	parent = this.subscription_list.get_item(parent, true);

	// add required tree elements to the parent if not already there
	if (!$('div.treetoggle', parent).length) {
	$('<div> </div>').addClass('treetoggle collapsed').appendTo(parent);
	}
	if (!$('ul', parent).length) {
	$('<ul>').css('display', 'none').appendTo(parent);
	}
	}

	if (parent && n == parent) {
	$('ul:first', parent).append(row);
	}
	else {
	while (p = $(n).parent().parent().get(0)) {
	if (parent && p == parent)
	break;
	if (!$(p).is('li.mailbox'))
	break;
	n = p;
	}

	$(n).after(row);
	}
	}
	else {
	list_element.append(row);
	}

	// add subfolders
	$.extend(this.env.subscriptionrows, subfolders \|\| {});

	// update list widget
	this.subscription_list.reset(true);
	this.subscription_select();

	// expand parent
	if (parent) {
	this.subscription_list.expand(this.folder_id2name(parent.id));
	}

	row = row.show().get(0);
	if (row.scrollIntoView)
	row.scrollIntoView();

	return row;
	};

	// replace an existing table row with a new folder line (with subfolders)
	this.replace_folder_row = function(oldid, id, name, display_name, is_protected, class_name)
	{
	if (!this.gui_objects.subscriptionlist) {
	if (this.is_framed()) {
	// @FIXME: for some reason this 'parent' variable need to be prefixed with 'window.'
	return window.parent.rcmail.replace_folder_row(oldid, id, name, display_name, is_protected, class_name);
	}

	return false;
	}

	// reset searching
	if (this.subscription_list.is_search()) {
	this.subscription_select();
	this.subscription_list.reset_search();
	}

	var subfolders = {},
	row = this.subscription_list.get_item(oldid, true),
	parent = $(row).parent(),
	old_folder = this.env.subscriptionrows[oldid],
	prefix_len_id = oldid.length,
	prefix_len_name = old_folder[0].length,
	subscribed = $('input[name="_subscribed[]"]:first', row).prop('checked');

	// no renaming, only update class_name
	if (oldid == id) {
	$(row).attr('class', class_name \|\| '');
	return;
	}

	// update subfolders
	$('li', row).each(function() {
	var fname = ref.folder_id2name(this.id),
	folder = ref.env.subscriptionrows[fname],
	newid = id + fname.slice(prefix_len_id);

	this.id = 'rcmli' + ref.html_identifier_encode(newid);
	$('input[name="_subscribed[]"]:first', this).val(newid);
	folder[0] = name + folder[0].slice(prefix_len_name);

	subfolders[newid] = folder;
	delete ref.env.subscriptionrows[fname];
	});

	// get row off the list
	row = $(row).detach();

	delete this.env.subscriptionrows[oldid];

	// remove parent list/toggle elements if not needed
	if (parent.get(0) != this.gui_objects.subscriptionlist && !$('li', parent).length) {
	$('ul,div.treetoggle', parent.parent()).remove();
	}

	// move the existing table row
	this.add_folder_row(id, name, display_name, is_protected, subscribed, class_name, row, subfolders);
	};

	// remove the table row of a specific mailbox from the table
	this.remove_folder_row = function(folder)
	{
	// reset searching
	if (this.subscription_list.is_search()) {
	this.subscription_select();
	this.subscription_list.reset_search();
	}

	var list = [], row = this.subscription_list.get_item(folder, true);

	// get subfolders if any
	$('li', row).each(function() { list.push(ref.folder_id2name(this.id)); });

	// remove folder row (and subfolders)
	this.subscription_list.remove(folder);

	// update local list variable
	list.push(folder);
	$.each(list, function(i, v) { delete ref.env.subscriptionrows[v]; });
	};

	this.subscribe = function(folder)
	{
	if (folder) {
	var lock = this.display_message(this.get_label('foldersubscribing'), 'loading');
	this.http_post('subscribe', {_mbox: folder}, lock);
	}
	};

	this.unsubscribe = function(folder)
	{
	if (folder) {
	var lock = this.display_message(this.get_label('folderunsubscribing'), 'loading');
	this.http_post('unsubscribe', {_mbox: folder}, lock);
	}
	};

	// when user select a folder in manager
	this.show_folder = function(folder, path, force)
	{
	var win, target = window,
	url = '&_action=edit-folder&_mbox='+urlencode(folder);

	if (path)
	url += '&_path='+urlencode(path);

	if (win = this.get_frame_window(this.env.contentframe)) {
	target = win;
	url += '&_framed=1';
	}

	if (String(target.location.href).indexOf(url) >= 0 && !force)
	this.show_contentframe(true);
	else
	this.location_href(this.env.comm_path+url, target, true);
	};

	// disables subscription checkbox (for protected folder)
	this.disable_subscription = function(folder)
	{
	var row = this.subscription_list.get_item(folder, true);
	if (row)
	$('input[name="_subscribed[]"]:first', row).prop('disabled', true);
	};

	// resets state of subscription checkbox (e.g. on error)
	this.reset_subscription = function(folder, state)
	{
	var row = this.subscription_list.get_item(folder, true);
	if (row)
	$('input[name="_subscribed[]"]:first', row).prop('checked', state);
	};

	this.folder_size = function(folder)
	{
	var lock = this.set_busy(true, 'loading');
	this.http_post('folder-size', {_mbox: folder}, lock);
	};

	this.folder_size_update = function(size)
	{
	$('#folder-size').replaceWith(size);
	};

	// filter folders by namespace
	this.folder_filter = function(prefix)
	{
	this.subscription_list.reset_search();

	this.subscription_list.container.children('li').each(function() {
	var i, folder = ref.folder_id2name(this.id);
	// show all folders
	if (prefix == '---') {
	}
	// got namespace prefix
	else if (prefix) {
	if (folder !== prefix) {
	$(this).data('filtered', true).hide();
	return
	}
	}
	// no namespace prefix, filter out all other namespaces
	else {
	// first get all namespace roots
	for (i in ref.env.ns_roots) {
	if (folder === ref.env.ns_roots[i]) {
	$(this).data('filtered', true).hide();
	return;
	}
	}
	}

	$(this).removeData('filtered').show();
	});
	};

	/*********************************************************/
	/******* GUI functionality *******/
	/*********************************************************/

	var init_button = function(cmd, prop)
	{
	var elm = document.getElementById(prop.id);
	if (!elm)
	return;

	var preload = false;
	if (prop.type == 'image') {
	elm = elm.parentNode;
	preload = true;
	}

	elm._command = cmd;
	elm._id = prop.id;
	if (prop.sel) {
	elm.onmousedown = function(e) { return ref.button_sel(this._command, this._id); };
	elm.onmouseup = function(e) { return ref.button_out(this._command, this._id); };
	if (preload)
	new Image().src = prop.sel;
	}
	if (prop.over) {
	elm.onmouseover = function(e) { return ref.button_over(this._command, this._id); };
	elm.onmouseout = function(e) { return ref.button_out(this._command, this._id); };
	if (preload)
	new Image().src = prop.over;
	}
	};

	// set event handlers on registered buttons
	this.init_buttons = function()
	{
	for (var cmd in this.buttons) {
	if (typeof cmd !== 'string')
	continue;

	for (var i=0; i<this.buttons[cmd].length; i++) {
	init_button(cmd, this.buttons[cmd][i]);
	}
	}
	};

	// set button to a specific state
	this.set_button = function(command, state)
	{
	var n, button, obj, $obj, a_buttons = this.buttons[command],
	len = a_buttons ? a_buttons.length : 0;

	for (n=0; n<len; n++) {
	button = a_buttons[n];
	obj = document.getElementById(button.id);

	if (!obj \|\| button.status === state)
	continue;

	// get default/passive setting of the button
	if (button.type == 'image' && !button.status) {
	button.pas = obj._original_src ? obj._original_src : obj.src;
	// respect PNG fix on IE browsers
	if (obj.runtimeStyle && obj.runtimeStyle.filter && obj.runtimeStyle.filter.match(/src=['"]([^'"]+)['"]/))
	button.pas = RegExp.$1;
	}
	else if (!button.status)
	button.pas = String(obj.className);

	button.status = state;

	// set image according to button state
	if (button.type == 'image' && button[state]) {
	obj.src = button[state];
	}
	// set class name according to button state
	else if (button[state] !== undefined) {
	obj.className = button[state];
	}
	// disable/enable input buttons
	if (button.type == 'input') {
	obj.disabled = state == 'pas';
	}
	else if (button.type == 'uibutton') {
	button.status = state;
	$(obj).button('option', 'disabled', state == 'pas');
	}
	else {
	$obj = $(obj);
	$obj
	.attr('tabindex', state == 'pas' \|\| state == 'sel' ? '-1' : ($obj.attr('data-tabindex') \|\| '0'))
	.attr('aria-disabled', state == 'pas' \|\| state == 'sel' ? 'true' : 'false');
	}
	}
	};

	// display a specific alttext
	this.set_alttext = function(command, label)
	{
	var n, button, obj, link, a_buttons = this.buttons[command],
	len = a_buttons ? a_buttons.length : 0;

	for (n=0; n<len; n++) {
	button = a_buttons[n];
	obj = document.getElementById(button.id);

	if (button.type == 'image' && obj) {
	obj.setAttribute('alt', this.get_label(label));
	if ((link = obj.parentNode) && link.tagName.toLowerCase() == 'a')
	link.setAttribute('title', this.get_label(label));
	}
	else if (obj)
	obj.setAttribute('title', this.get_label(label));
	}
	};

	// mouse over button
	this.button_over = function(command, id)
	{
	this.button_event(command, id, 'over');
	};

	// mouse down on button
	this.button_sel = function(command, id)
	{
	this.button_event(command, id, 'sel');
	};

	// mouse out of button
	this.button_out = function(command, id)
	{
	this.button_event(command, id, 'act');
	};

	// event of button
	this.button_event = function(command, id, event)
	{
	var n, button, obj, a_buttons = this.buttons[command],
	len = a_buttons ? a_buttons.length : 0;

	for (n=0; n<len; n++) {
	button = a_buttons[n];
	if (button.id == id && button.status == 'act') {
	if (button[event] && (obj = document.getElementById(button.id))) {
	obj[button.type == 'image' ? 'src' : 'className'] = button[event];
	}

	if (event == 'sel') {
	this.buttons_sel[id] = command;
	}
	}
	}
	};

	// write to the document/window title
	this.set_pagetitle = function(title)
	{
	if (title && document.title)
	document.title = title;
	};

	// display a system message, list of types in common.css (below #message definition)
	this.display_message = function(msg, type, timeout, key)
	{
	// pass command to parent window
	if (this.is_framed())
	return parent.rcmail.display_message(msg, type, timeout);

	if (!this.gui_objects.message) {
	// save message in order to display after page loaded
	if (type != 'loading')
	this.pending_message = [msg, type, timeout, key];
	return 1;
	}

	if (!type)
	type = 'notice';

	if (!key)
	key = this.html_identifier(msg);

	var date = new Date(),
	id = type + date.getTime();

	if (!timeout) {
	switch (type) {
	case 'error':
	case 'warning':
	timeout = this.message_time * 2;
	break;

	case 'uploading':
	timeout = 0;
	break;

	default:
	timeout = this.message_time;
	}
	}

	if (type == 'loading') {
	key = 'loading';
	timeout = this.env.request_timeout * 1000;
	if (!msg)
	msg = this.get_label('loading');
	}

	// The same message is already displayed
	if (this.messages[key]) {
	// replace label
	if (this.messages[key].obj)
	this.messages[key].obj.html(msg);
	// store label in stack
	if (type == 'loading') {
	this.messages[key].labels.push({'id': id, 'msg': msg});
	}
	// add element and set timeout
	this.messages[key].elements.push(id);
	setTimeout(function() { ref.hide_message(id, type == 'loading'); }, timeout);
	return id;
	}

	// create DOM object and display it
	var obj = $('<div>').addClass(type).html(msg).data('key', key),
	cont = $(this.gui_objects.message).append(obj).show();

	this.messages[key] = {'obj': obj, 'elements': [id]};

	if (type == 'loading') {
	this.messages[key].labels = [{'id': id, 'msg': msg}];
	}
	else if (type != 'uploading') {
	obj.click(function() { return ref.hide_message(obj); })
	.attr('role', 'alert');
	}

	this.triggerEvent('message', { message:msg, type:type, timeout:timeout, object:obj });

	if (timeout > 0)
	setTimeout(function() { ref.hide_message(id, type != 'loading'); }, timeout);

	return id;
	};

	// make a message to disapear
	this.hide_message = function(obj, fade)
	{
	// pass command to parent window
	if (this.is_framed())
	return parent.rcmail.hide_message(obj, fade);

	if (!this.gui_objects.message)
	return;

	var k, n, i, o, m = this.messages;

	// Hide message by object, don't use for 'loading'!
	if (typeof obj === 'object') {
	o = $(obj);
	k = o.data('key');
	this.hide_message_object(o, fade);
	if (m[k])
	delete m[k];
	}
	// Hide message by id
	else {
	for (k in m) {
	for (n in m[k].elements) {
	if (m[k] && m[k].elements[n] == obj) {
	m[k].elements.splice(n, 1);
	// hide DOM element if last instance is removed
	if (!m[k].elements.length) {
	this.hide_message_object(m[k].obj, fade);
	delete m[k];
	}
	// set pending action label for 'loading' message
	else if (k == 'loading') {
	for (i in m[k].labels) {
	if (m[k].labels[i].id == obj) {
	delete m[k].labels[i];
	}
	else {
	o = m[k].labels[i].msg;
	m[k].obj.html(o);
	}
	}
	}
	}
	}
	}
	}
	};

	// hide message object and remove from the DOM
	this.hide_message_object = function(o, fade)
	{
	if (fade)
	o.fadeOut(600, function() {$(this).remove(); });
	else
	o.hide().remove();
	};

	// remove all messages immediately
	this.clear_messages = function()
	{
	// pass command to parent window
	if (this.is_framed())
	return parent.rcmail.clear_messages();

	var k, n, m = this.messages;

	for (k in m)
	for (n in m[k].elements)
	if (m[k].obj)
	this.hide_message_object(m[k].obj);

	this.messages = {};
	};

	// display uploading message with progress indicator
	// data should contain: name, total, current, percent, text
	this.display_progress = function(data)
	{
	if (!data \|\| !data.name)
	return;

	var msg = this.messages['progress' + data.name];

	if (!data.label)
	data.label = this.get_label('uploadingmany');

	if (!msg) {
	if (!data.percent \|\| data.percent < 100)
	this.display_message(data.label, 'uploading', 0, 'progress' + data.name);
	return;
	}

	if (!data.total \|\| data.percent >= 100) {
	this.hide_message(msg.obj);
	return;
	}

	if (data.text)
	data.label += ' ' + data.text;

	msg.obj.text(data.label);
	};

	// open a jquery UI dialog with the given content
	this.show_popup_dialog = function(content, title, buttons, options)
	{
	// forward call to parent window
	if (this.is_framed()) {
	return parent.rcmail.show_popup_dialog(content, title, buttons, options);
	}

	var popup = $('<div class="popup">');

	if (typeof content == 'object')
	popup.append(content);
	else
	popup.html(content);

	options = $.extend({
	title: title,
	buttons: buttons,
	modal: true,
	resizable: true,
	width: 500,
	close: function(event, ui) { $(this).remove(); }
	}, options \|\| {});

	popup.dialog(options);

	// resize and center popup
	var win = $(window), w = win.width(), h = win.height(),
	width = popup.width(), height = popup.height();

	popup.dialog('option', {
	height: Math.min(h - 40, height + 75 + (buttons ? 50 : 0)),
	width: Math.min(w - 20, width + 36)
	});

	// assign special classes to dialog buttons
	$.each(options.button_classes \|\| [], function(i, v) {
	if (v) $($('.ui-dialog-buttonpane button.ui-button', popup.parent()).get(i)).addClass(v);
	});

	return popup;
	};

	// show_popup_dialog() wrapper for simple dialogs with Save and Cancel buttons
	this.simple_dialog = function(content, title, button_func, options)
	{
	var title = this.get_label(title),
	buttons = [{
	text: this.get_label((options \|\| {}).button \|\| 'save'),
	'class': 'mainaction',
	click: function() {
	if (button_func())
	$(this).dialog('close');
	}
	},
	{
	text: ref.get_label('cancel'),
	click: function() {
	$(this).dialog('close');
	}
	}];

	return this.show_popup_dialog(content, title, buttons, options);
	};

	// enable/disable buttons for page shifting
	this.set_page_buttons = function()
	{
	this.enable_command('nextpage', 'lastpage', this.env.pagecount > this.env.current_page);
	this.enable_command('previouspage', 'firstpage', this.env.current_page > 1);

	this.update_pagejumper();
	};

	// mark a mailbox as selected and set environment variable
	this.select_folder = function(name, prefix, encode)
	{
	if (this.savedsearchlist) {
	this.savedsearchlist.select('');
	}

	if (this.treelist) {
	this.treelist.select(name);
	}
	else if (this.gui_objects.folderlist) {
	$('li.selected', this.gui_objects.folderlist).removeClass('selected');
	$(this.get_folder_li(name, prefix, encode)).addClass('selected');

	// trigger event hook
	this.triggerEvent('selectfolder', { folder:name, prefix:prefix });
	}
	};

	// adds a class to selected folder
	this.mark_folder = function(name, class_name, prefix, encode)
	{
	$(this.get_folder_li(name, prefix, encode)).addClass(class_name);
	this.triggerEvent('markfolder', {folder: name, mark: class_name, status: true});
	};

	// adds a class to selected folder
	this.unmark_folder = function(name, class_name, prefix, encode)
	{
	$(this.get_folder_li(name, prefix, encode)).removeClass(class_name);
	this.triggerEvent('markfolder', {folder: name, mark: class_name, status: false});
	};

	// helper method to find a folder list item
	this.get_folder_li = function(name, prefix, encode)
	{
	if (!prefix)
	prefix = 'rcmli';

	if (this.gui_objects.folderlist) {
	name = this.html_identifier(name, encode);
	return document.getElementById(prefix+name);
	}
	};

	// for reordering column array (Konqueror workaround)
	// and for setting some message list global variables
	this.set_message_coltypes = function(listcols, repl, smart_col)
	{
	var list = this.message_list,
	thead = list ? list.thead : null,
	repl, cell, col, n, len, tr;

	this.env.listcols = listcols;

	if (!this.env.coltypes)
	this.env.coltypes = {};

	// replace old column headers
	if (thead) {
	if (repl) {
	thead.innerHTML = '';
	tr = document.createElement('tr');

	for (c=0, len=repl.length; c < len; c++) {
	cell = document.createElement('th');
	cell.innerHTML = repl[c].html \|\| '';
	if (repl[c].id) cell.id = repl[c].id;
	if (repl[c].className) cell.className = repl[c].className;
	tr.appendChild(cell);
	}
	thead.appendChild(tr);
	}

	for (n=0, len=this.env.listcols.length; n<len; n++) {
	col = this.env.listcols[n];
	if ((cell = thead.rows[0].cells[n]) && (col == 'from' \|\| col == 'to' \|\| col == 'fromto')) {
	$(cell).attr('rel', col).find('span,a').text(this.get_label(col == 'fromto' ? smart_col : col));
	}
	}
	}

	this.env.subject_col = null;
	this.env.flagged_col = null;
	this.env.status_col = null;

	if (this.env.coltypes.folder)
	this.env.coltypes.folder.hidden = !(this.env.search_request \|\| this.env.search_id) \|\| this.env.search_scope == 'base';

	if ((n = $.inArray('subject', this.env.listcols)) >= 0) {
	this.env.subject_col = n;
	if (list)
	list.subject_col = n;
	}
	if ((n = $.inArray('flag', this.env.listcols)) >= 0)
	this.env.flagged_col = n;
	if ((n = $.inArray('status', this.env.listcols)) >= 0)
	this.env.status_col = n;

	if (list) {
	list.hide_column('folder', (this.env.coltypes.folder && this.env.coltypes.folder.hidden) \|\| $.inArray('folder', this.env.listcols) < 0);
	list.init_header();
	}
	};

	// replace content of row count display
	this.set_rowcount = function(text, mbox)
	{
	// #1487752
	if (mbox && mbox != this.env.mailbox)
	return false;

	$(this.gui_objects.countdisplay).html(text);

	// update page navigation buttons
	this.set_page_buttons();
	};

	// replace content of mailboxname display
	this.set_mailboxname = function(content)
	{
	if (this.gui_objects.mailboxname && content)
	this.gui_objects.mailboxname.innerHTML = content;
	};

	// replace content of quota display
	this.set_quota = function(content)
	{
	if (this.gui_objects.quotadisplay && content && content.type == 'text')
	$(this.gui_objects.quotadisplay).text((content.percent\|\|0) + '%').attr('title', content.title);

	this.triggerEvent('setquota', content);
	this.env.quota_content = content;
	};

	// update trash folder state
	this.set_trash_count = function(count)
	{
	this[(count ? 'un' : '') + 'mark_folder'](this.env.trash_mailbox, 'empty', '', true);
	};

	// update the mailboxlist
	this.set_unread_count = function(mbox, count, set_title, mark)
	{
	if (!this.gui_objects.mailboxlist)
	return false;

	this.env.unread_counts[mbox] = count;
	this.set_unread_count_display(mbox, set_title);

	if (mark)
	this.mark_folder(mbox, mark, '', true);
	else if (!count)
	this.unmark_folder(mbox, 'recent', '', true);
	};

	// update the mailbox count display
	this.set_unread_count_display = function(mbox, set_title)
	{
	var reg, link, text_obj, item, mycount, childcount, div;

	if (item = this.get_folder_li(mbox, '', true)) {
	mycount = this.env.unread_counts[mbox] ? this.env.unread_counts[mbox] : 0;
	link = $(item).children('a').eq(0);
	text_obj = link.children('span.unreadcount');
	if (!text_obj.length && mycount)
	text_obj = $('<span>').addClass('unreadcount').appendTo(link);
	reg = /\s+$[0-9]+$$/i;

	childcount = 0;
	if ((div = item.getElementsByTagName('div')[0]) &&
	div.className.match(/collapsed/)) {
	// add children's counters
	for (var k in this.env.unread_counts)
	if (k.startsWith(mbox + this.env.delimiter))
	childcount += this.env.unread_counts[k];
	}

	if (mycount && text_obj.length)
	text_obj.html(this.env.unreadwrap.replace(/%[sd]/, mycount));
	else if (text_obj.length)
	text_obj.remove();

	// set parent's display
	reg = new RegExp(RegExp.escape(this.env.delimiter) + '[^' + RegExp.escape(this.env.delimiter) + ']+$');
	if (mbox.match(reg))
	this.set_unread_count_display(mbox.replace(reg, ''), false);

	// set the right classes
	if ((mycount+childcount)>0)
	$(item).addClass('unread');
	else
	$(item).removeClass('unread');
	}

	// set unread count to window title
	reg = /^$[0-9]+$\s+/i;
	if (set_title && document.title) {
	var new_title = '',
	doc_title = String(document.title);

	if (mycount && doc_title.match(reg))
	new_title = doc_title.replace(reg, '('+mycount+') ');
	else if (mycount)
	new_title = '('+mycount+') '+doc_title;
	else
	new_title = doc_title.replace(reg, '');

	this.set_pagetitle(new_title);
	}
	};

	// display fetched raw headers
	this.set_headers = function(content)
	{
	if (this.gui_objects.all_headers_row && this.gui_objects.all_headers_box && content)
	$(this.gui_objects.all_headers_box).html(content).show();
	};

	// display all-headers row and fetch raw message headers
	this.show_headers = function(props, elem)
	{
	if (!this.gui_objects.all_headers_row \|\| !this.gui_objects.all_headers_box \|\| !this.env.uid)
	return;

	$(elem).removeClass('show-headers').addClass('hide-headers');
	$(this.gui_objects.all_headers_row).show();
	elem.onclick = function() { ref.command('hide-headers', '', elem); };

	// fetch headers only once
	if (!this.gui_objects.all_headers_box.innerHTML) {
	this.http_post('headers', {_uid: this.env.uid, _mbox: this.env.mailbox},
	this.display_message(this.get_label('loading'), 'loading')
	);
	}
	};

	// hide all-headers row
	this.hide_headers = function(props, elem)
	{
	if (!this.gui_objects.all_headers_row \|\| !this.gui_objects.all_headers_box)
	return;

	$(elem).removeClass('hide-headers').addClass('show-headers');
	$(this.gui_objects.all_headers_row).hide();
	elem.onclick = function() { ref.command('show-headers', '', elem); };
	};

	// create folder selector popup, position and display it
	this.folder_selector = function(event, callback)
	{
	var container = this.folder_selector_element;

	if (!container) {
	var rows = [],
	delim = this.env.delimiter,
	ul = $('<ul class="toolbarmenu">'),
	link = document.createElement('a');

	container = $('<div id="folder-selector" class="popupmenu"></div>');
	link.href = '#';
	link.className = 'icon';

	// loop over sorted folders list
	$.each(this.env.mailboxes_list, function() {
	var n = 0, s = 0,
	folder = ref.env.mailboxes[this],
	id = folder.id,
	a = $(link.cloneNode(false)),
	row = $('<li>');

	if (folder.virtual)
	a.addClass('virtual').attr('aria-disabled', 'true').attr('tabindex', '-1');
	else
	a.addClass('active').data('id', folder.id);

	if (folder['class'])
	a.addClass(folder['class']);

	// calculate/set indentation level
	while ((s = id.indexOf(delim, s)) >= 0) {
	n++; s++;
	}
	a.css('padding-left', n ? (n * 16) + 'px' : 0);

	// add folder name element
	a.append($('<span>').text(folder.name));

	row.append(a);
	rows.push(row);
	});

	ul.append(rows).appendTo(container);

	// temporarily show element to calculate its size
	container.css({left: '-1000px', top: '-1000px'})
	.appendTo($('body')).show();

	// set max-height if the list is long
	if (rows.length > 10)
	container.css('max-height', $('li', container)[0].offsetHeight * 10 + 9);

	// register delegate event handler for folder item clicks
	container.on('click', 'a.active', function(e){
	container.data('callback')($(this).data('id'));
	return false;
	});

	this.folder_selector_element = container;
	}

	container.data('callback', callback);

	// position menu on the screen
	this.show_menu('folder-selector', true, event);
	};


	/***********************************************/
	/******* popup menu functions *******/
	/***********************************************/

	// Show/hide a specific popup menu
	this.show_menu = function(prop, show, event)
	{
	var name = typeof prop == 'object' ? prop.menu : prop,
	obj = $('#'+name),
	ref = event && event.target ? $(event.target) : $(obj.attr('rel') \|\| '#'+name+'link'),
	keyboard = rcube_event.is_keyboard(event),
	align = obj.attr('data-align') \|\| '',
	stack = false;

	// find "real" button element
	if (ref.get(0).tagName != 'A' && ref.closest('a').length)
	ref = ref.closest('a');

	if (typeof prop == 'string')
	prop = { menu:name };

	// let plugins or skins provide the menu element
	if (!obj.length) {
	obj = this.triggerEvent('menu-get', { name:name, props:prop, originalEvent:event });
	}

	if (!obj \|\| !obj.length) {
	// just delegate the action to subscribers
	return this.triggerEvent(show === false ? 'menu-close' : 'menu-open', { name:name, props:prop, originalEvent:event });
	}

	// move element to top for proper absolute positioning
	obj.appendTo(document.body);

	if (typeof show == 'undefined')
	show = obj.is(':visible') ? false : true;

	if (show && ref.length) {
	var win = $(window),
	pos = ref.offset(),
	above = align.indexOf('bottom') >= 0;

	stack = ref.attr('role') == 'menuitem' \|\| ref.closest('[role=menuitem]').length > 0;

	ref.offsetWidth = ref.outerWidth();
	ref.offsetHeight = ref.outerHeight();
	if (!above && pos.top + ref.offsetHeight + obj.height() > win.height()) {
	above = true;
	}
	if (align.indexOf('right') >= 0) {
	pos.left = pos.left + ref.outerWidth() - obj.width();
	}
	else if (stack) {
	pos.left = pos.left + ref.offsetWidth - 5;
	pos.top -= ref.offsetHeight;
	}
	if (pos.left + obj.width() > win.width()) {
	pos.left = win.width() - obj.width() - 12;
	}
	pos.top = Math.max(0, pos.top + (above ? -obj.height() : ref.offsetHeight));
	obj.css({ left:pos.left+'px', top:pos.top+'px' });
	}

	// add menu to stack
	if (show) {
	// truncate stack down to the one containing the ref link
	for (var i = this.menu_stack.length - 1; stack && i >= 0; i--) {
	if (!$(ref).parents('#'+this.menu_stack[i]).length && $(event.target).parent().attr('role') != 'menuitem')
	this.hide_menu(this.menu_stack[i], event);
	}
	if (stack && this.menu_stack.length) {
	obj.data('parent', $.last(this.menu_stack));
	obj.css('z-index', ($('#'+$.last(this.menu_stack)).css('z-index') \|\| 0) + 1);
	}
	else if (!stack && this.menu_stack.length) {
	this.hide_menu(this.menu_stack[0], event);
	}

	obj.show().attr('aria-hidden', 'false').data('opener', ref.attr('aria-expanded', 'true').get(0));
	this.triggerEvent('menu-open', { name:name, obj:obj, props:prop, originalEvent:event });
	this.menu_stack.push(name);

	this.menu_keyboard_active = show && keyboard;
	if (this.menu_keyboard_active) {
	this.focused_menu = name;
	obj.find('a,input:not(:disabled)').not('[aria-disabled=true]').first().focus();
	}
	}
	else { // close menu
	this.hide_menu(name, event);
	}

	return show;
	};

	// hide the given popup menu (and it's childs)
	this.hide_menu = function(name, event)
	{
	if (!this.menu_stack.length) {
	// delegate to subscribers
	this.triggerEvent('menu-close', { name:name, props:{ menu:name }, originalEvent:event });
	return;
	}

	var obj, keyboard = rcube_event.is_keyboard(event);
	for (var j=this.menu_stack.length-1; j >= 0; j--) {
	obj = $('#' + this.menu_stack[j]).hide().attr('aria-hidden', 'true').data('parent', false);
	this.triggerEvent('menu-close', { name:this.menu_stack[j], obj:obj, props:{ menu:this.menu_stack[j] }, originalEvent:event });
	if (this.menu_stack[j] == name) {
	j = -1; // stop loop
	if (obj.data('opener')) {
	$(obj.data('opener')).attr('aria-expanded', 'false');
	if (keyboard)
	obj.data('opener').focus();
	}
	}
	this.menu_stack.pop();
	}

	// focus previous menu in stack
	if (this.menu_stack.length && keyboard) {
	this.menu_keyboard_active = true;
	this.focused_menu = $.last(this.menu_stack);
	if (!obj \|\| !obj.data('opener'))
	$('#'+this.focused_menu).find('a,input:not(:disabled)').not('[aria-disabled=true]').first().focus();
	}
	else {
	this.focused_menu = null;
	this.menu_keyboard_active = false;
	}
	}


	// position a menu element on the screen in relation to other object
	this.element_position = function(element, obj)
	{
	var obj = $(obj), win = $(window),
	width = obj.outerWidth(),
	height = obj.outerHeight(),
	menu_pos = obj.data('menu-pos'),
	win_height = win.height(),
	elem_height = $(element).height(),
	elem_width = $(element).width(),
	pos = obj.offset(),
	top = pos.top,
	left = pos.left + width;

	if (menu_pos == 'bottom') {
	top += height;
	left -= width;
	}
	else
	left -= 5;

	if (top + elem_height > win_height) {
	top -= elem_height - height;
	if (top < 0)
	top = Math.max(0, (win_height - elem_height) / 2);
	}

	if (left + elem_width > win.width())
	left -= elem_width + width;

	element.css({left: left + 'px', top: top + 'px'});
	};

	// initialize HTML editor
	this.editor_init = function(config, id)
	{
	this.editor = new rcube_text_editor(config, id);
	};


	/********************************************************/
	/******* html to text conversion functions *******/
	/********************************************************/

	this.html2plain = function(html, func)
	{
	return this.format_converter(html, 'html', func);
	};

	this.plain2html = function(plain, func)
	{
	return this.format_converter(plain, 'plain', func);
	};

	this.format_converter = function(text, format, func)
	{
	// warn the user (if converted content is not empty)
	if (!text
	\|\| (format == 'html' && !(text.replace(/<[^>]+>\| \|\xC2\xA0\|\s/g, '')).length)
	\|\| (format != 'html' && !(text.replace(/\xC2\xA0\|\s/g, '')).length)
	) {
	// without setTimeout() here, textarea is filled with initial (onload) content
	if (func)
	setTimeout(function() { func(''); }, 50);
	return true;
	}

	var confirmed = this.env.editor_warned \|\| confirm(this.get_label('editorwarning'));

	this.env.editor_warned = true;

	if (!confirmed)
	return false;

	var url = '?_task=utils&_action=' + (format == 'html' ? 'html2text' : 'text2html'),
	lock = this.set_busy(true, 'converting');

	$.ajax({ type: 'POST', url: url, data: text, contentType: 'application/octet-stream',
	error: function(o, status, err) { ref.http_error(o, status, err, lock); },
	success: function(data) {
	ref.set_busy(false, null, lock);
	if (func) func(data);
	}
	});

	return true;
	};


	/********************************************************/
	/******* remote request methods *******/
	/********************************************************/

	// compose a valid url with the given parameters
	this.url = function(action, query)
	{
	var querystring = typeof query === 'string' ? query : '';

	if (typeof action !== 'string')
	query = action;
	else if (!query \|\| typeof query !== 'object')
	query = {};

	if (action)
	query._action = action;
	else if (this.env.action)
	query._action = this.env.action;

	var url = this.env.comm_path, k, param = {};

	// overwrite task name
	if (action && action.match(/([a-z0-9_-]+)\/([a-z0-9-_.]+)/)) {
	query._action = RegExp.$2;
	url = url.replace(/\_task=[a-z0-9_-]+/, '_task=' + RegExp.$1);
	}

	// remove undefined values
	for (k in query) {
	if (query[k] !== undefined && query[k] !== null)
	param[k] = query[k];
	}

	if (param = $.param(param))
	url += (url.indexOf('?') > -1 ? '&' : '?') + param;

	if (querystring)
	url += (url.indexOf('?') > -1 ? '&' : '?') + querystring;

	return url;
	};

	this.redirect = function(url, lock)
	{
	if (lock \|\| lock === null)
	this.set_busy(true);

	if (this.is_framed()) {
	parent.rcmail.redirect(url, lock);
	}
	else {
	if (this.env.extwin) {
	if (typeof url == 'string')
	url += (url.indexOf('?') < 0 ? '?' : '&') + '_extwin=1';
	else
	url._extwin = 1;
	}
	this.location_href(url, window);
	}
	};

	this.goto_url = function(action, query, lock, secure)
	{
	var url = this.url(action, query)
	if (secure) url = this.secure_url(url);
	this.redirect(url, lock);
	};

	this.location_href = function(url, target, frame)
	{
	if (frame)
	this.lock_frame();

	if (typeof url == 'object')
	url = this.env.comm_path + '&' + $.param(url);

	// simulate real link click to force IE to send referer header
	if (bw.ie && target == window)
	$('<a>').attr('href', url).appendTo(document.body).get(0).click();
	else
	target.location.href = url;

	// reset keep-alive interval
	this.start_keepalive();
	};

	// update browser location to remember current view
	this.update_state = function(query)
	{
	if (window.history.replaceState)
	window.history.replaceState({}, document.title, rcmail.url('', query));
	};

	// send a http request to the server
	this.http_request = function(action, data, lock, type)
	{
	if (type != 'POST')
	type = 'GET';

	if (typeof data !== 'object')
	data = rcube_parse_query(data);

	data._remote = 1;
	data._unlock = lock ? lock : 0;

	// trigger plugin hook
	var result = this.triggerEvent('request' + action, data);

	// abort if one of the handlers returned false
	if (result === false) {
	if (data._unlock)
	this.set_busy(false, null, data._unlock);
	return false;
	}
	else if (result !== undefined) {
	data = result;
	if (data._action) {
	action = data._action;
	delete data._action;
	}
	}

	var url = this.url(action);

	// reset keep-alive interval
	this.start_keepalive();

	// send request
	return $.ajax({
	type: type, url: url, data: data, dataType: 'json',
	success: function(data) { ref.http_response(data); },
	error: function(o, status, err) { ref.http_error(o, status, err, lock, action); }
	});
	};

	// send a http GET request to the server
	this.http_get = this.http_request;

	// send a http POST request to the server
	this.http_post = function(action, data, lock)
	{
	return this.http_request(action, data, lock, 'POST');
	};

	// aborts ajax request
	this.abort_request = function(r)
	{
	if (r.request)
	r.request.abort();
	if (r.lock)
	this.set_busy(false, null, r.lock);
	};

	// handle HTTP response
	this.http_response = function(response)
	{
	if (!response)
	return;

	if (response.unlock)
	this.set_busy(false);

	this.triggerEvent('responsebefore', {response: response});
	this.triggerEvent('responsebefore'+response.action, {response: response});

	// set env vars
	if (response.env)
	this.set_env(response.env);

	var i;

	// we have labels to add
	if (typeof response.texts === 'object') {
	for (i in response.texts)
	if (typeof response.texts[i] === 'string')
	this.add_label(i, response.texts[i]);
	}

	// if we get javascript code from server -> execute it
	if (response.exec) {
	eval(response.exec);
	}

	// execute callback functions of plugins
	if (response.callbacks && response.callbacks.length) {
	for (i=0; i < response.callbacks.length; i++)
	this.triggerEvent(response.callbacks[i][0], response.callbacks[i][1]);
	}

	// process the response data according to the sent action
	switch (response.action) {
	case 'delete':
	if (this.task == 'addressbook') {
	var sid, uid = this.contact_list.get_selection(), writable = false;

	if (uid && this.contact_list.rows[uid]) {
	// search results, get source ID from record ID
	if (this.env.source == '') {
	sid = String(uid).replace(/^[^-]+-/, '');
	writable = sid && this.env.address_sources[sid] && !this.env.address_sources[sid].readonly;
	}
	else {
	writable = !this.env.address_sources[this.env.source].readonly;
	}
	}
	this.enable_command('compose', (uid && this.contact_list.rows[uid]));
	this.enable_command('delete', 'edit', writable);
	this.enable_command('export', (this.contact_list && this.contact_list.rowcount > 0));
	this.enable_command('export-selected', 'print', false);
	}

	case 'move':
	if (this.env.action == 'show') {
	// re-enable commands on move/delete error
	this.enable_command(this.env.message_commands, true);
	if (!this.env.list_post)
	this.enable_command('reply-list', false);
	}
	else if (this.task == 'addressbook') {
	this.triggerEvent('listupdate', { folder:this.env.source, rowcount:this.contact_list.rowcount });
	}

	case 'purge':
	case 'expunge':
	if (this.task == 'mail') {
	if (!this.env.exists) {
	// clear preview pane content
	if (this.env.contentframe)
	this.show_contentframe(false);
	// disable commands useless when mailbox is empty
	this.enable_command(this.env.message_commands, 'purge', 'expunge',
	'select-all', 'select-none', 'expand-all', 'expand-unread', 'collapse-all', false);
	}
	if (this.message_list)
	this.triggerEvent('listupdate', { folder:this.env.mailbox, rowcount:this.message_list.rowcount });
	}
	break;

	case 'refresh':
	case 'check-recent':
	// update message flags
	$.each(this.env.recent_flags \|\| {}, function(uid, flags) {
	ref.set_message(uid, 'deleted', flags.deleted);
	ref.set_message(uid, 'replied', flags.answered);
	ref.set_message(uid, 'unread', !flags.seen);
	ref.set_message(uid, 'forwarded', flags.forwarded);
	ref.set_message(uid, 'flagged', flags.flagged);
	});
	delete this.env.recent_flags;

	case 'getunread':
	case 'search':
	this.env.qsearch = null;
	case 'list':
	if (this.task == 'mail') {
	var is_multifolder = this.is_multifolder_listing(),
	list = this.message_list,
	uid = this.env.list_uid;

	this.enable_command('show', 'select-all', 'select-none', this.env.messagecount > 0);
	this.enable_command('expunge', this.env.exists && !is_multifolder);
	this.enable_command('purge', this.purge_mailbox_test() && !is_multifolder);
	this.enable_command('import-messages', !is_multifolder);
	this.enable_command('expand-all', 'expand-unread', 'collapse-all', this.env.threading && this.env.messagecount && !is_multifolder);

	if (list) {
	if (response.action == 'list' \|\| response.action == 'search') {
	// highlight message row when we're back from message page
	if (uid) {
	if (!list.rows[uid])
	uid += '-' + this.env.mailbox;
	if (list.rows[uid]) {
	list.select(uid);
	}
	delete this.env.list_uid;
	}

	this.enable_command('set-listmode', this.env.threads && !is_multifolder);
	if (list.rowcount > 0 && !$(document.activeElement).is('input,textarea'))
	list.focus();

	// trigger 'select' so all dependent actions update its state
	// e.g. plugins use this event to activate buttons (#1490647)
	list.triggerEvent('select');
	}

	if (response.action != 'getunread')
	this.triggerEvent('listupdate', { folder:this.env.mailbox, rowcount:list.rowcount });
	}
	}
	else if (this.task == 'addressbook') {
	this.enable_command('export', (this.contact_list && this.contact_list.rowcount > 0));

	if (response.action == 'list' \|\| response.action == 'search') {
	this.enable_command('search-create', this.env.source == '');
	this.enable_command('search-delete', this.env.search_id);
	this.update_group_commands();
	if (this.contact_list.rowcount > 0 && !$(document.activeElement).is('input,textarea'))
	this.contact_list.focus();
	this.triggerEvent('listupdate', { folder:this.env.source, rowcount:this.contact_list.rowcount });
	}
	}
	break;

	case 'list-contacts':
	case 'search-contacts':
	if (this.contact_list && this.contact_list.rowcount > 0)
	this.contact_list.focus();
	break;
	}

	if (response.unlock)
	this.hide_message(response.unlock);

	this.triggerEvent('responseafter', {response: response});
	this.triggerEvent('responseafter'+response.action, {response: response});

	// reset keep-alive interval
	this.start_keepalive();
	};

	// handle HTTP request errors
	this.http_error = function(request, status, err, lock, action)
	{
	var errmsg = request.statusText;

	this.set_busy(false, null, lock);
	request.abort();

	// don't display error message on page unload (#1488547)
	if (this.unload)
	return;

	if (request.status && errmsg)
	this.display_message(this.get_label('servererror') + ' (' + errmsg + ')', 'error');
	else if (status == 'timeout')
	this.display_message(this.get_label('requesttimedout'), 'error');
	else if (request.status == 0 && status != 'abort')
	this.display_message(this.get_label('connerror'), 'error');

	// redirect to url specified in location header if not empty
	var location_url = request.getResponseHeader("Location");
	if (location_url && this.env.action != 'compose') // don't redirect on compose screen, contents might get lost (#1488926)
	this.redirect(location_url);

	// 403 Forbidden response (CSRF prevention) - reload the page.
	// In case there's a new valid session it will be used, otherwise
	// login form will be presented (#1488960).
	if (request.status == 403) {
	(this.is_framed() ? parent : window).location.reload();
	return;
	}

	// re-send keep-alive requests after 30 seconds
	if (action == 'keep-alive')
	setTimeout(function(){ ref.keep_alive(); ref.start_keepalive(); }, 30000);
	};

	// handler for session errors detected on the server
	this.session_error = function(redirect_url)
	{
	this.env.server_error = 401;

	// save message in local storage and do not redirect
	if (this.env.action == 'compose') {
	this.save_compose_form_local();
	this.compose_skip_unsavedcheck = true;
	}
	else if (redirect_url) {
	setTimeout(function(){ ref.redirect(redirect_url, true); }, 2000);
	}
	};

	// callback when an iframe finished loading
	this.iframe_loaded = function(unlock)
	{
	this.set_busy(false, null, unlock);

	if (this.submit_timer)
	clearTimeout(this.submit_timer);
	};

	/**
	Send multi-threaded parallel HTTP requests to the server for a list if items.
	The string '%' in either a GET query or POST parameters will be replaced with the respective item value.
	This is the argument object expected: {
	items: ['foo','bar','gna'], // list of items to send requests for
	action: 'task/some-action', // Roudncube action to call
	query: { q:'%s' }, // GET query parameters
	postdata: { source:'%s' }, // POST data (sends a POST request if present)
	threads: 3, // max. number of concurrent requests
	onresponse: function(data){ }, // Callback function called for every response received from server
	whendone: function(alldata){ } // Callback function called when all requests have been sent
	}
	*/
	this.multi_thread_http_request = function(prop)
	{
	var i, item, reqid = new Date().getTime(),
	threads = prop.threads \|\| 1;

	prop.reqid = reqid;
	prop.running = 0;
	prop.requests = [];
	prop.result = [];
	prop._items = $.extend([], prop.items); // copy items

	if (!prop.lock)
	prop.lock = this.display_message(this.get_label('loading'), 'loading');

	// add the request arguments to the jobs pool
	this.http_request_jobs[reqid] = prop;

	// start n threads
	for (i=0; i < threads; i++) {
	item = prop._items.shift();
	if (item === undefined)
	break;

	prop.running++;
	prop.requests.push(this.multi_thread_send_request(prop, item));
	}

	return reqid;
	};

	// helper method to send an HTTP request with the given iterator value
	this.multi_thread_send_request = function(prop, item)
	{
	var k, postdata, query;

	// replace %s in post data
	if (prop.postdata) {
	postdata = {};
	for (k in prop.postdata) {
	postdata[k] = String(prop.postdata[k]).replace('%s', item);
	}
	postdata._reqid = prop.reqid;
	}
	// replace %s in query
	else if (typeof prop.query == 'string') {
	query = prop.query.replace('%s', item);
	query += '&_reqid=' + prop.reqid;
	}
	else if (typeof prop.query == 'object' && prop.query) {
	query = {};
	for (k in prop.query) {
	query[k] = String(prop.query[k]).replace('%s', item);
	}
	query._reqid = prop.reqid;
	}

	// send HTTP GET or POST request
	return postdata ? this.http_post(prop.action, postdata) : this.http_request(prop.action, query);
	};

	// callback function for multi-threaded http responses
	this.multi_thread_http_response = function(data, reqid)
	{
	var prop = this.http_request_jobs[reqid];
	if (!prop \|\| prop.running <= 0 \|\| prop.cancelled)
	return;

	prop.running--;

	// trigger response callback
	if (prop.onresponse && typeof prop.onresponse == 'function') {
	prop.onresponse(data);
	}

	prop.result = $.extend(prop.result, data);

	// send next request if prop.items is not yet empty
	var item = prop._items.shift();
	if (item !== undefined) {
	prop.running++;
	prop.requests.push(this.multi_thread_send_request(prop, item));
	}
	// trigger whendone callback and mark this request as done
	else if (prop.running == 0) {
	if (prop.whendone && typeof prop.whendone == 'function') {
	prop.whendone(prop.result);
	}

	this.set_busy(false, '', prop.lock);

	// remove from this.http_request_jobs pool
	delete this.http_request_jobs[reqid];
	}
	};

	// abort a running multi-thread request with the given identifier
	this.multi_thread_request_abort = function(reqid)
	{
	var prop = this.http_request_jobs[reqid];
	if (prop) {
	for (var i=0; prop.running > 0 && i < prop.requests.length; i++) {
	if (prop.requests[i].abort)
	prop.requests[i].abort();
	}

	prop.running = 0;
	prop.cancelled = true;
	this.set_busy(false, '', prop.lock);
	}
	};

	// post the given form to a hidden iframe
	this.async_upload_form = function(form, action, onload)
	{
	// create hidden iframe
	var ts = new Date().getTime(),
	frame_name = 'rcmupload' + ts,
	frame = this.async_upload_form_frame(frame_name);

	// upload progress support
	if (this.env.upload_progress_name) {
	var fname = this.env.upload_progress_name,
	field = $('input[name='+fname+']', form);

	if (!field.length) {
	field = $('<input>').attr({type: 'hidden', name: fname});
	field.prependTo(form);
	}

	field.val(ts);
	}

	// handle upload errors by parsing iframe content in onload
	frame.on('load', {ts:ts}, onload);

	$(form).attr({
	target: frame_name,
	action: this.url(action, {_id: this.env.compose_id \|\| '', _uploadid: ts, _from: this.env.action}),
	method: 'POST'})
	.attr(form.encoding ? 'encoding' : 'enctype', 'multipart/form-data')
	.submit();

	return frame_name;
	};

	// create iframe element for files upload
	this.async_upload_form_frame = function(name)
	{
	return $('<iframe>').attr({name: name, style: 'border: none; width: 0; height: 0; visibility: hidden'})
	.appendTo(document.body);
	};

	// html5 file-drop API
	this.document_drag_hover = function(e, over)
	{
	// don't e.preventDefault() here to not block text dragging on the page (#1490619)
	$(this.gui_objects.filedrop)[(over?'addClass':'removeClass')]('active');
	};

	this.file_drag_hover = function(e, over)
	{
	e.preventDefault();
	e.stopPropagation();
	$(this.gui_objects.filedrop)[(over?'addClass':'removeClass')]('hover');
	};

	// handler when files are dropped to a designated area.
	// compose a multipart form data and submit it to the server
	this.file_dropped = function(e)
	{
	// abort event and reset UI
	this.file_drag_hover(e, false);

	// prepare multipart form data composition
	var uri, files = e.target.files \|\| e.dataTransfer.files,
	formdata = window.FormData ? new FormData() : null,
	fieldname = (this.env.filedrop.fieldname \|\| '_file') + (this.env.filedrop.single ? '' : '[]'),
	boundary = '------multipartformboundary' + (new Date).getTime(),
	dashdash = '--', crlf = '\r\n',
	multipart = dashdash + boundary + crlf,
	args = {_id: this.env.compose_id \|\| this.env.cid \|\| '', _remote: 1, _from: this.env.action};

	if (!files \|\| !files.length) {
	// Roundcube attachment, pass its uri to the backend and attach
	if (uri = e.dataTransfer.getData('roundcube-uri')) {
	var ts = new Date().getTime(),
	// jQuery way to escape filename (#1490530)
	content = $('<span>').text(e.dataTransfer.getData('roundcube-name') \|\| this.get_label('attaching')).html();

	args._uri = uri;
	args._uploadid = ts;

	// add to attachments list
	if (!this.add2attachment_list(ts, {name: '', html: content, classname: 'uploading', complete: false}))
	this.file_upload_id = this.set_busy(true, 'attaching');

	this.http_post(this.env.filedrop.action \|\| 'upload', args);
	}
	return;
	}

	// inline function to submit the files to the server
	var submit_data = function() {
	var multiple = files.length > 1,
	ts = new Date().getTime(),
	// jQuery way to escape filename (#1490530)
	content = $('<span>').text(multiple ? ref.get_label('uploadingmany') : files[0].name).html();

	// add to attachments list
	if (!ref.add2attachment_list(ts, { name:'', html:content, classname:'uploading', complete:false }))
	ref.file_upload_id = ref.set_busy(true, 'uploading');

	// complete multipart content and post request
	multipart += dashdash + boundary + dashdash + crlf;

	args._uploadid = ts;

	$.ajax({
	type: 'POST',
	dataType: 'json',
	url: ref.url(ref.env.filedrop.action \|\| 'upload', args),
	contentType: formdata ? false : 'multipart/form-data; boundary=' + boundary,
	processData: false,
	timeout: 0, // disable default timeout set in ajaxSetup()
	data: formdata \|\| multipart,
	headers: {'X-Roundcube-Request': ref.env.request_token},
	xhr: function() { var xhr = jQuery.ajaxSettings.xhr(); if (!formdata && xhr.sendAsBinary) xhr.send = xhr.sendAsBinary; return xhr; },
	success: function(data){ ref.http_response(data); },
	error: function(o, status, err) { ref.http_error(o, status, err, null, 'attachment'); }
	});
	};

	// get contents of all dropped files
	var last = this.env.filedrop.single ? 0 : files.length - 1;
	for (var j=0, i=0, f; j <= last && (f = files[i]); i++) {
	if (!f.name) f.name = f.fileName;
	if (!f.size) f.size = f.fileSize;
	if (!f.type) f.type = 'application/octet-stream';

	// file name contains non-ASCII characters, do UTF8-binary string conversion.
	if (!formdata && /[^\x20-\x7E]/.test(f.name))
	f.name_bin = unescape(encodeURIComponent(f.name));

	// filter by file type if requested
	if (this.env.filedrop.filter && !f.type.match(new RegExp(this.env.filedrop.filter))) {
	// TODO: show message to user
	continue;
	}

	// do it the easy way with FormData (FF 4+, Chrome 5+, Safari 5+)
	if (formdata) {
	formdata.append(fieldname, f);
	if (j == last)
	return submit_data();
	}
	// use FileReader supporetd by Firefox 3.6
	else if (window.FileReader) {
	var reader = new FileReader();

	// closure to pass file properties to async callback function
	reader.onload = (function(file, j) {
	return function(e) {
	multipart += 'Content-Disposition: form-data; name="' + fieldname + '"';
	multipart += '; filename="' + (f.name_bin \|\| file.name) + '"' + crlf;
	multipart += 'Content-Length: ' + file.size + crlf;
	multipart += 'Content-Type: ' + file.type + crlf + crlf;
	multipart += reader.result + crlf;
	multipart += dashdash + boundary + crlf;

	if (j == last) // we're done, submit the data
	return submit_data();
	}
	})(f,j);
	reader.readAsBinaryString(f);
	}
	// Firefox 3
	else if (f.getAsBinary) {
	multipart += 'Content-Disposition: form-data; name="' + fieldname + '"';
	multipart += '; filename="' + (f.name_bin \|\| f.name) + '"' + crlf;
	multipart += 'Content-Length: ' + f.size + crlf;
	multipart += 'Content-Type: ' + f.type + crlf + crlf;
	multipart += f.getAsBinary() + crlf;
	multipart += dashdash + boundary +crlf;

	if (j == last)
	return submit_data();
	}

	j++;
	}
	};

	// starts interval for keep-alive signal
	this.start_keepalive = function()
	{
	if (!this.env.session_lifetime \|\| this.env.framed \|\| this.env.extwin \|\| this.task == 'login' \|\| this.env.action == 'print')
	return;

	if (this._keepalive)
	clearInterval(this._keepalive);

	// use Math to prevent from an integer overflow (#5273)
	// maximum interval is 15 minutes, minimum is 30 seconds
	var interval = Math.min(1800, this.env.session_lifetime) * 0.5 * 1000;
	this._keepalive = setInterval(function() { ref.keep_alive(); }, interval < 30000 ? 30000 : interval);
	};

	// starts interval for refresh signal
	this.start_refresh = function()
	{
	if (!this.env.refresh_interval \|\| this.env.framed \|\| this.env.extwin \|\| this.task == 'login' \|\| this.env.action == 'print')
	return;

	if (this._refresh)
	clearInterval(this._refresh);

	this._refresh = setInterval(function(){ ref.refresh(); }, this.env.refresh_interval * 1000);
	};

	// sends keep-alive signal
	this.keep_alive = function()
	{
	if (!this.busy)
	this.http_request('keep-alive');
	};

	// sends refresh signal
	this.refresh = function()
	{
	if (this.busy) {
	// try again after 10 seconds
	setTimeout(function(){ ref.refresh(); ref.start_refresh(); }, 10000);
	return;
	}

	var params = {}, lock = this.set_busy(true, 'refreshing');

	if (this.task == 'mail' && this.gui_objects.mailboxlist)
	params = this.check_recent_params();

	params._last = Math.floor(this.env.lastrefresh.getTime() / 1000);
	this.env.lastrefresh = new Date();

	// plugins should bind to 'requestrefresh' event to add own params
	this.http_post('refresh', params, lock);
	};

	// returns check-recent request parameters
	this.check_recent_params = function()
	{
	var params = {_mbox: this.env.mailbox};

	if (this.gui_objects.mailboxlist)
	params._folderlist = 1;
	if (this.gui_objects.quotadisplay)
	params._quota = 1;
	if (this.env.search_request)
	params._search = this.env.search_request;

	if (this.gui_objects.messagelist) {
	params._list = 1;

	// message uids for flag updates check
	params._uids = $.map(this.message_list.rows, function(row, uid) { return uid; }).join(',');
	}

	return params;
	};


	/********************************************************/
	/******* helper methods *******/
	/********************************************************/

	/**
	* Quote html entities
	*/
	this.quote_html = function(str)
	{
	return String(str).replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
	};

	// get window.opener.rcmail if available
	this.opener = function(deep, filter)
	{
	var i, win = window.opener;

	// catch Error: Permission denied to access property rcmail
	try {
	if (win && !win.closed) {
	// try parent of the opener window, e.g. preview frame
	if (deep && (!win.rcmail \|\| win.rcmail.env.framed) && win.parent && win.parent.rcmail)
	win = win.parent;

	if (win.rcmail && filter)
	for (i in filter)
	if (win.rcmail.env[i] != filter[i])
	return;

	return win.rcmail;
	}
	}
	catch (e) {}
	};

	// check if we're in show mode or if we have a unique selection
	// and return the message uid
	this.get_single_uid = function()
	{
	var uid = this.env.uid \|\| (this.message_list ? this.message_list.get_single_selection() : null);
	var result = ref.triggerEvent('get_single_uid', { uid: uid });
	return result \|\| uid;
	};

	// same as above but for contacts
	this.get_single_cid = function()
	{
	var cid = this.env.cid \|\| (this.contact_list ? this.contact_list.get_single_selection() : null);
	var result = ref.triggerEvent('get_single_cid', { cid: cid });
	return result \|\| cid;
	};

	// get the IMP mailbox of the message with the given UID
	this.get_message_mailbox = function(uid)
	{
	var msg = (this.env.messages && uid ? this.env.messages[uid] : null) \|\| {};
	return msg.mbox \|\| this.env.mailbox;
	};

	// build request parameters from single message id (maybe with mailbox name)
	this.params_from_uid = function(uid, params)
	{
	if (!params)
	params = {};

	params._uid = String(uid).split('-')[0];
	params._mbox = this.get_message_mailbox(uid);

	return params;
	};

	// gets cursor position
	this.get_caret_pos = function(obj)
	{
	if (obj.selectionEnd !== undefined)
	return obj.selectionEnd;

	return obj.value.length;
	};

	// moves cursor to specified position
	this.set_caret_pos = function(obj, pos)
	{
	try {
	if (obj.setSelectionRange)
	obj.setSelectionRange(pos, pos);
	}
	catch(e) {} // catch Firefox exception if obj is hidden
	};

	// get selected text from an input field
	this.get_input_selection = function(obj)
	{
	var start = 0, end = 0, normalizedValue = '';

	if (typeof obj.selectionStart == "number" && typeof obj.selectionEnd == "number") {
	normalizedValue = obj.value;
	start = obj.selectionStart;
	end = obj.selectionEnd;
	}

	return {start: start, end: end, text: normalizedValue.substr(start, end-start)};
	};

	// disable/enable all fields of a form
	this.lock_form = function(form, lock)
	{
	if (!form \|\| !form.elements)
	return;

	var n, len, elm;

	if (lock)
	this.disabled_form_elements = [];

	for (n=0, len=form.elements.length; n<len; n++) {
	elm = form.elements[n];

	if (elm.type == 'hidden')
	continue;
	// remember which elem was disabled before lock
	if (lock && elm.disabled)
	this.disabled_form_elements.push(elm);
	else if (lock \|\| $.inArray(elm, this.disabled_form_elements) < 0)
	elm.disabled = lock;
	}
	};

	this.mailto_handler_uri = function()
	{
	return location.href.split('?')[0] + '?_task=mail&_action=compose&_to=%s';
	};

	this.register_protocol_handler = function(name)
	{
	try {
	window.navigator.registerProtocolHandler('mailto', this.mailto_handler_uri(), name);
	}
	catch(e) {
	this.display_message(String(e), 'error');
	}
	};

	this.check_protocol_handler = function(name, elem)
	{
	var nav = window.navigator;

	if (!nav \|\| (typeof nav.registerProtocolHandler != 'function')) {
	$(elem).addClass('disabled').click(function(){ return false; });
	}
	else if (typeof nav.isProtocolHandlerRegistered == 'function') {
	var status = nav.isProtocolHandlerRegistered('mailto', this.mailto_handler_uri());
	if (status)
	$(elem).parent().find('.mailtoprotohandler-status').html(status);
	}
	else {
	$(elem).click(function() { ref.register_protocol_handler(name); return false; });
	}
	};

	// Checks browser capabilities eg. PDF support, TIF support
	this.browser_capabilities_check = function()
	{
	if (!this.env.browser_capabilities)
	this.env.browser_capabilities = {};

	$.each(['pdf', 'flash', 'tiff', 'webp'], function() {
	if (ref.env.browser_capabilities[this] === undefined)
	ref.env.browser_capabilities[this] = ref[this + '_support_check']();
	});
	};

	// Returns browser capabilities string
	this.browser_capabilities = function()
	{
	if (!this.env.browser_capabilities)
	return '';

	var n, ret = [];

	for (n in this.env.browser_capabilities)
	ret.push(n + '=' + this.env.browser_capabilities[n]);

	return ret.join();
	};

	this.tiff_support_check = function()
	{
	this.image_support_check('tiff');
	return 0;
	};

	this.webp_support_check = function()
	{
	this.image_support_check('webp');
	return 0;
	};

	this.image_support_check = function(type)
	{
	window.setTimeout(function() {
	var img = new Image();
	img.onload = function() { ref.env.browser_capabilities[type] = 1; };
	img.onerror = function() { ref.env.browser_capabilities[type] = 0; };
	img.src = ref.assets_path('program/resources/blank.' + type);
	}, 10);
	};

	this.pdf_support_check = function()
	{
	var plugin = navigator.mimeTypes ? navigator.mimeTypes["application/pdf"] : {},
	plugins = navigator.plugins,
	len = plugins.length,
	regex = /Adobe Reader\|PDF\|Acrobat/i;

	if (plugin && plugin.enabledPlugin)
	return 1;

	if ('ActiveXObject' in window) {
	try {
	if (plugin = new ActiveXObject("AcroPDF.PDF"))
	return 1;
	}
	catch (e) {}
	try {
	if (plugin = new ActiveXObject("PDF.PdfCtrl"))
	return 1;
	}
	catch (e) {}
	}

	for (i=0; i<len; i++) {
	plugin = plugins[i];
	if (typeof plugin === 'String') {
	if (regex.test(plugin))
	return 1;
	}
	else if (plugin.name && regex.test(plugin.name))
	return 1;
	}

	window.setTimeout(function() {
	$('<object>').css({position: 'absolute', left: '-10000px'})
	.attr({data: ref.assets_path('program/resources/dummy.pdf'), width: 1, height: 1, type: 'application/pdf'})
	.on('load', function() { ref.env.browser_capabilities.pdf = 1; })
	.on('error', function() { ref.env.browser_capabilities.pdf = 0; })
	.appendTo($('body'));
	}, 10);

	return 0;
	};

	this.flash_support_check = function()
	{
	var plugin = navigator.mimeTypes ? navigator.mimeTypes["application/x-shockwave-flash"] : {};

	if (plugin && plugin.enabledPlugin)
	return 1;

	if ('ActiveXObject' in window) {
	try {
	if (plugin = new ActiveXObject("ShockwaveFlash.ShockwaveFlash"))
	return 1;
	}
	catch (e) {}
	}

	return 0;
	};

	this.assets_path = function(path)
	{
	if (this.env.assets_path && !path.startsWith(this.env.assets_path)) {
	path = this.env.assets_path + path;
	}

	return path;
	};

	// Cookie setter
	this.set_cookie = function(name, value, expires)
	{
	setCookie(name, value, expires, this.env.cookie_path, this.env.cookie_domain, this.env.cookie_secure);
	};

	this.get_local_storage_prefix = function()
	{
	if (!this.local_storage_prefix)
	this.local_storage_prefix = 'roundcube.' + (this.env.user_id \|\| 'anonymous') + '.';

	return this.local_storage_prefix;
	};

	// wrapper for localStorage.getItem(key)
	this.local_storage_get_item = function(key, deflt, encrypted)
	{
	var item, result;

	// TODO: add encryption
	try {
	item = localStorage.getItem(this.get_local_storage_prefix() + key);
	result = JSON.parse(item);
	}
	catch (e) { }

	return result \|\| deflt \|\| null;
	};

	// wrapper for localStorage.setItem(key, data)
	this.local_storage_set_item = function(key, data, encrypted)
	{
	// try/catch to handle no localStorage support, but also error
	// in Safari-in-private-browsing-mode where localStorage exists
	// but can't be used (#1489996)
	try {
	// TODO: add encryption
	localStorage.setItem(this.get_local_storage_prefix() + key, JSON.stringify(data));
	return true;
	}
	catch (e) {
	return false;
	}
	};

	// wrapper for localStorage.removeItem(key)
	this.local_storage_remove_item = function(key)
	{
	try {
	localStorage.removeItem(this.get_local_storage_prefix() + key);
	return true;
	}
	catch (e) {
	return false;
	}
	};

	this.print_dialog = function()
	{
	if (bw.safari)
	setTimeout('window.print()', 10);
	else
	window.print();
	};
	} // end object rcube_webmail


	// some static methods
	rcube_webmail.long_subject_title = function(elem, indent)
	{
	if (!elem.title) {
	var $elem = $(elem);
	if ($elem.width() + (indent \|\| 0) * 15 > $elem.parent().width())
	elem.title = rcube_webmail.subject_text(elem);
	}
	};

	rcube_webmail.long_subject_title_ex = function(elem)
	{
	if (!elem.title) {
	var $elem = $(elem),
	txt = $.trim($elem.text()),
	tmp = $('<span>').text(txt)
	.css({'position': 'absolute', 'float': 'left', 'visibility': 'hidden',
	'font-size': $elem.css('font-size'), 'font-weight': $elem.css('font-weight')})
	.appendTo($('body')),
	w = tmp.width();

	tmp.remove();
	if (w + $('span.branch', $elem).width() * 15 > $elem.width())
	elem.title = rcube_webmail.subject_text(elem);
	}
	};

	rcube_webmail.subject_text = function(elem)
	{
	var t = $(elem).clone();
	t.find('.skip-on-drag,.skip-content,.voice').remove();
	return t.text();
	};

	// set event handlers on all iframe elements (and their contents)
	rcube_webmail.set_iframe_events = function(events)
	{
	$('iframe').each(function() {
	var frame = $(this);
	$.each(events, function(event_name, event_handler) {
	frame.on('load', function(e) {
	try { $(this).contents().on(event_name, event_handler); }
	catch (e) {/* catch possible permission error in IE */ }
	});

	try { frame.contents().on(event_name, event_handler); }
	catch (e) {/* catch possible permission error in IE */ }
	});
	});
	};

	rcube_webmail.prototype.get_cookie = getCookie;

	// copy event engine prototype
	rcube_webmail.prototype.addEventListener = rcube_event_engine.prototype.addEventListener;
	rcube_webmail.prototype.removeEventListener = rcube_event_engine.prototype.removeEventListener;
	rcube_webmail.prototype.triggerEvent = rcube_event_engine.prototype.triggerEvent;

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