text: /* (Manage)Sieve Filters */
  
  if (window.rcmail) {
    rcmail.addEventListener('init', function(evt) {
      // add managesieve-create command to message_commands array,
      // so it's state will be updated on message selection/unselection
      if (rcmail.env.task == 'mail') {
        if (rcmail.env.action != 'show')
          rcmail.env.message_commands.push('managesieve-create');
        else
          rcmail.enable_command('managesieve-create', true);
      }
      else {
        var tab = $('<span>').attr('id', 'settingstabpluginmanagesieve').addClass('tablink filter'),
          button = $('<a>').attr('href', rcmail.env.comm_path+'&_action=plugin.managesieve')
            .attr('title', rcmail.gettext('managesieve.managefilters'))
            .html(rcmail.gettext('managesieve.filters'))
            .appendTo(tab);
  
        // add tab
        rcmail.add_element(tab, 'tabs');
      }
  
      if (rcmail.env.task == 'mail' || rcmail.env.action.indexOf('plugin.managesieve') != -1) {
        // Create layer for form tips
        if (!rcmail.env.framed) {
          rcmail.env.ms_tip_layer = $('<div id="managesieve-tip" class="popupmenu"></div>');
          rcmail.env.ms_tip_layer.appendTo(document.body);
        }
      }
  
      // register commands
      rcmail.register_command('plugin.managesieve-save', function() { rcmail.managesieve_save() });
      rcmail.register_command('plugin.managesieve-act', function() { rcmail.managesieve_act() });
      rcmail.register_command('plugin.managesieve-add', function() { rcmail.managesieve_add() });
      rcmail.register_command('plugin.managesieve-del', function() { rcmail.managesieve_del() });
      rcmail.register_command('plugin.managesieve-move', function() { rcmail.managesieve_move() });
      rcmail.register_command('plugin.managesieve-setadd', function() { rcmail.managesieve_setadd() });
      rcmail.register_command('plugin.managesieve-setdel', function() { rcmail.managesieve_setdel() });
      rcmail.register_command('plugin.managesieve-setact', function() { rcmail.managesieve_setact() });
      rcmail.register_command('plugin.managesieve-setget', function() { rcmail.managesieve_setget() });
  
      if (rcmail.env.action == 'plugin.managesieve' || rcmail.env.action == 'plugin.managesieve-save') {
        if (rcmail.gui_objects.sieveform) {
          rcmail.enable_command('plugin.managesieve-save', true);
  
          // small resize for header element
          $('select[name="_header[]"]', rcmail.gui_objects.sieveform).each(function() {
            if (this.value == '...') this.style.width = '40px';
          });
  
          // resize dialog window
          if (rcmail.env.action == 'plugin.managesieve' && rcmail.env.task == 'mail') {
            parent.rcmail.managesieve_dialog_resize(rcmail.gui_objects.sieveform);
          }
  
          $('input[type="text"]:first', rcmail.gui_objects.sieveform).focus();
        }
        else {
          rcmail.enable_command('plugin.managesieve-add', 'plugin.managesieve-setadd', !rcmail.env.sieveconnerror);
        }
  
        var i, p = rcmail, setcnt, set = rcmail.env.currentset;
  
        if (rcmail.gui_objects.filterslist) {
          rcmail.filters_list = new rcube_list_widget(rcmail.gui_objects.filterslist,
            {multiselect:false, draggable:true, keyboard:false});
          rcmail.filters_list.addEventListener('select', function(e) { p.managesieve_select(e); });
          rcmail.filters_list.addEventListener('dragstart', function(e) { p.managesieve_dragstart(e); });
          rcmail.filters_list.addEventListener('dragend', function(e) { p.managesieve_dragend(e); });
          rcmail.filters_list.row_init = function (row) {
            row.obj.onmouseover = function() { p.managesieve_focus_filter(row); };
            row.obj.onmouseout = function() { p.managesieve_unfocus_filter(row); };
          };
          rcmail.filters_list.init();
          rcmail.filters_list.focus();
        }
  
        if (rcmail.gui_objects.filtersetslist) {
          rcmail.filtersets_list = new rcube_list_widget(rcmail.gui_objects.filtersetslist, {multiselect:false, draggable:false, keyboard:false});
          rcmail.filtersets_list.addEventListener('select', function(e) { p.managesieve_setselect(e); });
          rcmail.filtersets_list.init();
          rcmail.filtersets_list.focus();
  
          if (set != null) {
            set = rcmail.managesieve_setid(set);
            rcmail.filtersets_list.shift_start = set;
            rcmail.filtersets_list.highlight_row(set, false);
          }
  
          setcnt = rcmail.filtersets_list.rowcount;
          rcmail.enable_command('plugin.managesieve-set', true);
          rcmail.enable_command('plugin.managesieve-setact', 'plugin.managesieve-setget', setcnt);
          rcmail.enable_command('plugin.managesieve-setdel', setcnt > 1);
  
          // Fix dragging filters over sets list
          $('tr', rcmail.gui_objects.filtersetslist).each(function (i, e) { p.managesieve_fixdragend(e); });
        }
      }
      if (rcmail.gui_objects.sieveform && rcmail.env.rule_disabled)
        $('#disabled').attr('checked', true);
    });
  };
  
  /*********************************************************/
  /*********       Managesieve UI methods          *********/
  /*********************************************************/
  
  rcube_webmail.prototype.managesieve_add = function()
  {
    this.load_managesieveframe();
    this.filters_list.clear_selection();
  };
  
  rcube_webmail.prototype.managesieve_del = function()
  {
    var id = this.filters_list.get_single_selection();
    if (confirm(this.get_label('managesieve.filterdeleteconfirm'))) {
      var lock = this.set_busy(true, 'loading');
      this.http_post('plugin.managesieve',
        '_act=delete&_fid='+this.filters_list.rows[id].uid, lock);
    }
  };
  
  rcube_webmail.prototype.managesieve_act = function()
  {
    var id = this.filters_list.get_single_selection(),
      lock = this.set_busy(true, 'loading');
  
    this.http_post('plugin.managesieve',
      '_act=act&_fid='+this.filters_list.rows[id].uid, lock);
  };
  
  // Filter selection
  rcube_webmail.prototype.managesieve_select = function(list)
  {
    var id = list.get_single_selection();
    if (id != null)
      this.load_managesieveframe(list.rows[id].uid);
  };
  
  // Set selection
  rcube_webmail.prototype.managesieve_setselect = function(list)
  {
    this.show_contentframe(false);
    this.filters_list.clear(true);
    this.enable_command('plugin.managesieve-setdel', list.rowcount > 1);
    this.enable_command( 'plugin.managesieve-setact', 'plugin.managesieve-setget', true);
  
    var id = list.get_single_selection();
    if (id != null)
      this.managesieve_list(this.env.filtersets[id]);
  };
  
  rcube_webmail.prototype.managesieve_rowid = function(id)
  {
    var i, rows = this.filters_list.rows;
  
    for (i=0; i<rows.length; i++)
      if (rows[i] != null && rows[i].uid == id)
        return i;
  };
  
  // Returns set's identifier
  rcube_webmail.prototype.managesieve_setid = function(name)
  {
    for (var i in this.env.filtersets)
      if (this.env.filtersets[i] == name)
        return i;
  };
  
  // Filters listing request
  rcube_webmail.prototype.managesieve_list = function(script)
  {
    var lock = this.set_busy(true, 'loading');
  
    this.http_post('plugin.managesieve', '_act=list&_set='+urlencode(script), lock);
  };
  
  // Script download request
  rcube_webmail.prototype.managesieve_setget = function()
  {
    var id = this.filtersets_list.get_single_selection(),
      script = this.env.filtersets[id];
  
    location.href = this.env.comm_path+'&_action=plugin.managesieve&_act=setget&_set='+urlencode(script);
  };
  
  // Set activate/deactivate request
  rcube_webmail.prototype.managesieve_setact = function()
  {
    var id = this.filtersets_list.get_single_selection(),
     lock = this.set_busy(true, 'loading'),
      script = this.env.filtersets[id],
      action = $('#rcmrow'+id).hasClass('disabled') ? 'setact' : 'deact';
  
    this.http_post('plugin.managesieve', '_act='+action+'&_set='+urlencode(script), lock);
  };
  
  // Set delete request
  rcube_webmail.prototype.managesieve_setdel = function()
  {
    if (!confirm(this.get_label('managesieve.setdeleteconfirm')))
      return false;
  
    var id = this.filtersets_list.get_single_selection(),
      lock = this.set_busy(true, 'loading'),
      script = this.env.filtersets[id];
  
    this.http_post('plugin.managesieve', '_act=setdel&_set='+urlencode(script), lock);
  };
  
  // Set add request
  rcube_webmail.prototype.managesieve_setadd = function()
  {
    this.filters_list.clear_selection();
    this.enable_command('plugin.managesieve-act', 'plugin.managesieve-del', false);
  
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe]) {
      var lock = this.set_busy(true, 'loading');
      target = window.frames[this.env.contentframe];
      target.location.href = this.env.comm_path+'&_action=plugin.managesieve&_framed=1&_newset=1&_unlock='+lock;
    }
  };
  
  rcube_webmail.prototype.managesieve_updatelist = function(action, o)
  {
    this.set_busy(true);
  
    switch (action) {
  
      // Delete filter row
      case 'del':
        var i = 0, list = this.filters_list;
  
        list.remove_row(this.managesieve_rowid(o.id));
        list.clear_selection();
        this.show_contentframe(false);
        this.enable_command('plugin.managesieve-del', 'plugin.managesieve-act', false);
  
        // filter identifiers changed, fix the list
        $('tr', this.filters_list.list).each(function() {
          // remove hidden (deleted) rows
          if (this.style.display == 'none') {
            $(this).detach();
            return;
          }
  
          // modify ID and remove all attached events
          $(this).attr('id', 'rcmrow'+(i++)).unbind();
        });
        list.init();
  
        break;
  
      // Update filter row
      case 'update':
        var i, row = $('#rcmrow'+this.managesieve_rowid(o.id));
  
        if (o.name)
          $('td', row).text(o.name);
        if (o.disabled)
          row.addClass('disabled');
        else
          row.removeClass('disabled');
  
        $('#disabled', $('iframe').contents()).prop('checked', o.disabled);
  
        break;
  
      // Add filter row to the list
      case 'add':
        var list = this.filters_list,
          row = $('<tr><td class="name"></td></tr>');
  
        $('td', row).text(o.name);
        row.attr('id', 'rcmrow'+o.id);
        if (o.disabled)
          row.addClass('disabled');
  
        list.insert_row(row.get(0));
        list.highlight_row(o.id);
  
        this.enable_command('plugin.managesieve-del', 'plugin.managesieve-act', true);
  
        break;
  
      // Filling rules list
      case 'list':
        var i, tr, td, el, list = this.filters_list;
  
        if (o.clear)
          list.clear();
  
        for (i in o.list) {
          el = o.list[i];
          tr = document.createElement('TR');
          td = document.createElement('TD');
  
          $(td).text(el.name);
          td.className = 'name';
          tr.id = 'rcmrow' + el.id;
          if (el['class'])
              tr.className = el['class'];
          tr.appendChild(td);
  
          list.insert_row(tr);
        }
  
        if (o.set)
          list.highlight_row(o.set);
        else
          this.enable_command('plugin.managesieve-del', 'plugin.managesieve-act', false);
  
        break;
  
      // Sactivate/deactivate set
      case 'setact':
        var id = this.managesieve_setid(o.name), row = $('#rcmrow' + id);
        if (o.active) {
          if (o.all)
            $('tr', this.gui_objects.filtersetslist).addClass('disabled');
          row.removeClass('disabled');
        }
        else
          row.addClass('disabled');
  
        break;
  
      // Delete set row
      case 'setdel':
        var id = this.managesieve_setid(o.name);
  
        this.filtersets_list.remove_row(id);
        this.filters_list.clear();
        this.show_contentframe(false);
        this.enable_command('plugin.managesieve-setdel', 'plugin.managesieve-setact', 'plugin.managesieve-setget', false);
  
        delete this.env.filtersets[id];
  
        break;
  
      // Create set row
      case 'setadd':
        var id = 'S' + new Date().getTime(),
          list = this.filtersets_list,
          row = $('<tr class="disabled"><td class="name"></td></tr>');
  
        $('td', row).text(o.name);
        row.attr('id', 'rcmrow'+id);
  
        this.env.filtersets[id] = o.name;
        list.insert_row(row.get(0));
  
        // move row into its position on the list
        if (o.index != list.rowcount-1) {
          row.detach();
          var elem = $('tr:visible', list.list).get(o.index);
          row.insertBefore(elem);
        }
  
        list.select(id);
  
        // Fix dragging filters over sets list
        this.managesieve_fixdragend(row);
  
        break;
    }
  
    this.set_busy(false);
  };
  
  // load filter frame
  rcube_webmail.prototype.load_managesieveframe = function(id)
  {
    var has_id = typeof(id) != 'undefined' && id != null;
    this.enable_command('plugin.managesieve-act', 'plugin.managesieve-del', has_id);
  
    if (this.env.contentframe && window.frames && window.frames[this.env.contentframe]) {
      target = window.frames[this.env.contentframe];
      var msgid = this.set_busy(true, 'loading');
      target.location.href = this.env.comm_path+'&_action=plugin.managesieve&_framed=1'
        +(has_id ? '&_fid='+id : '')+'&_unlock='+msgid;
    }
  };
  
  // load filter frame
  rcube_webmail.prototype.managesieve_dragstart = function(list)
  {
    var id = this.filters_list.get_single_selection();
  
    this.drag_active = true;
    this.drag_filter = id;
  };
  
  rcube_webmail.prototype.managesieve_dragend = function(e)
  {
    if (this.drag_active) {
      if (this.drag_filter_target) {
        var lock = this.set_busy(true, 'loading');
  
        this.show_contentframe(false);
        this.http_post('plugin.managesieve', '_act=move&_fid='+this.drag_filter
          +'&_to='+this.drag_filter_target, lock);
      }
      this.drag_active = false;
    }
  };
  
  // Fixes filters dragging over sets list
  // @TODO: to be removed after implementing copying filters
  rcube_webmail.prototype.managesieve_fixdragend = function(elem)
  {
    var p = this;
    $(elem).bind('mouseup' + ((bw.iphone || bw.ipad) ? ' touchend' : ''), function(e) {
      if (p.drag_active)
        p.filters_list.drag_mouse_up(e);
    });
  };
  
  rcube_webmail.prototype.managesieve_focus_filter = function(row)
  {
    var id = row.id.replace(/^rcmrow/, '');
    if (this.drag_active && id != this.drag_filter) {
      this.drag_filter_target = id;
      $(row.obj).addClass(id < this.drag_filter ? 'filtermoveup' : 'filtermovedown');
    }
  };
  
  rcube_webmail.prototype.managesieve_unfocus_filter = function(row)
  {
    if (this.drag_active) {
      $(row.obj).removeClass('filtermoveup filtermovedown');
      this.drag_filter_target = null;
    }
  };
  
  /*********************************************************/
  /*********          Filter Form methods          *********/
  /*********************************************************/
  
  // Form submition
  rcube_webmail.prototype.managesieve_save = function()
  {
    if (parent.rcmail && parent.rcmail.filters_list && this.gui_objects.sieveform.name != 'filtersetform') {
      var id = parent.rcmail.filters_list.get_single_selection();
      if (id != null)
        this.gui_objects.sieveform.elements['_fid'].value = parent.rcmail.filters_list.rows[id].uid;
    }
    this.gui_objects.sieveform.submit();
  };
  
  // Operations on filters form
  rcube_webmail.prototype.managesieve_ruleadd = function(id)
  {
    this.http_post('plugin.managesieve', '_act=ruleadd&_rid='+id);
  };
  
  rcube_webmail.prototype.managesieve_rulefill = function(content, id, after)
  {
    if (content != '') {
      // create new element
      var div = document.getElementById('rules'),
        row = document.createElement('div');
  
      this.managesieve_insertrow(div, row, after);
      // fill row after inserting (for IE)
      row.setAttribute('id', 'rulerow'+id);
      row.className = 'rulerow';
      row.innerHTML = content;
  
      this.managesieve_formbuttons(div);
    }
  };
  
  rcube_webmail.prototype.managesieve_ruledel = function(id)
  {
    if ($('#ruledel'+id).hasClass('disabled'))
      return;
  
    if (confirm(this.get_label('managesieve.ruledeleteconfirm'))) {
      var row = document.getElementById('rulerow'+id);
      row.parentNode.removeChild(row);
      this.managesieve_formbuttons(document.getElementById('rules'));
    }
  };
  
  rcube_webmail.prototype.managesieve_actionadd = function(id)
  {
    this.http_post('plugin.managesieve', '_act=actionadd&_aid='+id);
  };
  
  rcube_webmail.prototype.managesieve_actionfill = function(content, id, after)
  {
    if (content != '') {
      var div = document.getElementById('actions'),
        row = document.createElement('div');
  
      this.managesieve_insertrow(div, row, after);
      // fill row after inserting (for IE)
      row.className = 'actionrow';
      row.setAttribute('id', 'actionrow'+id);
      row.innerHTML = content;
  
      this.managesieve_formbuttons(div);
    }
  };
  
  rcube_webmail.prototype.managesieve_actiondel = function(id)
  {
    if ($('#actiondel'+id).hasClass('disabled'))
      return;
  
    if (confirm(this.get_label('managesieve.actiondeleteconfirm'))) {
      var row = document.getElementById('actionrow'+id);
      row.parentNode.removeChild(row);
      this.managesieve_formbuttons(document.getElementById('actions'));
    }
  };
  
  // insert rule/action row in specified place on the list
  rcube_webmail.prototype.managesieve_insertrow = function(div, row, after)
  {
    for (var i=0; i<div.childNodes.length; i++) {
      if (div.childNodes[i].id == (div.id == 'rules' ? 'rulerow' : 'actionrow')  + after)
        break;
    }
  
    if (div.childNodes[i+1])
      div.insertBefore(row, div.childNodes[i+1]);
    else
      div.appendChild(row);
  };
  
  // update Delete buttons status
  rcube_webmail.prototype.managesieve_formbuttons = function(div)
  {
    var i, button, buttons = [];
  
    // count and get buttons
    for (i=0; i<div.childNodes.length; i++) {
      if (div.id == 'rules' && div.childNodes[i].id) {
        if (/rulerow/.test(div.childNodes[i].id))
          buttons.push('ruledel' + div.childNodes[i].id.replace(/rulerow/, ''));
      }
      else if (div.childNodes[i].id) {
        if (/actionrow/.test(div.childNodes[i].id))
          buttons.push( 'actiondel' + div.childNodes[i].id.replace(/actionrow/, ''));
      }
    }
  
    for (i=0; i<buttons.length; i++) {
      button = document.getElementById(buttons[i]);
      if (i>0 || buttons.length>1) {
        $(button).removeClass('disabled');
      }
      else {
        $(button).addClass('disabled');
      }
    }
  };
  
  function rule_header_select(id)
  {
    var obj = document.getElementById('header' + id),
      size = document.getElementById('rule_size' + id),
      op = document.getElementById('rule_op' + id),
      target = document.getElementById('rule_target' + id),
      header = document.getElementById('custom_header' + id),
      mod = document.getElementById('rule_mod' + id),
      trans = document.getElementById('rule_trans' + id),
      comp = document.getElementById('rule_comp' + id);
  
    if (obj.value == 'size') {
      size.style.display = 'inline';
      op.style.display = 'none';
      target.style.display = 'none';
      header.style.display = 'none';
      mod.style.display = 'none';
      trans.style.display = 'none';
      comp.style.display = 'none';
    }
    else {
      header.style.display = obj.value != '...' ? 'none' : 'inline';
      size.style.display = 'none';
      op.style.display = 'inline';
      comp.style.display = '';
      rule_op_select(id);
      mod.style.display = obj.value == 'body' ? 'none' : 'block';
      trans.style.display = obj.value == 'body' ? 'block' : 'none';
    }
  
    obj.style.width = obj.value == '...' ? '40px' : '';
  };
  
  function rule_op_select(id)
  {
    var obj = document.getElementById('rule_op' + id),
      target = document.getElementById('rule_target' + id);
  
    target.style.display = obj.value == 'exists' || obj.value == 'notexists' ? 'none' : 'inline';
  };
  
  function rule_trans_select(id)
  {
    var obj = document.getElementById('rule_trans_op' + id),
      target = document.getElementById('rule_trans_type' + id);
  
    target.style.display = obj.value != 'content' ? 'none' : 'inline';
  };
  
  function rule_mod_select(id)
  {
    var obj = document.getElementById('rule_mod_op' + id),
      target = document.getElementById('rule_mod_type' + id);
  
    target.style.display = obj.value != 'address' && obj.value != 'envelope' ? 'none' : 'inline';
  };
  
  function rule_join_radio(value)
  {
    $('#rules').css('display', value == 'any' ? 'none' : 'block');
  };
  
  function rule_adv_switch(id, elem)
  {
    var elem = $(elem), enabled = elem.hasClass('hide'), adv = $('#rule_advanced'+id);
  
    if (enabled) {
      adv.hide();
      elem.removeClass('hide').addClass('show');
    }
    else {
      adv.show();
      elem.removeClass('show').addClass('hide');
    }
  }
  
  function action_type_select(id)
  {
    var obj = document.getElementById('action_type' + id),
      enabled = {},
      elems = {
        mailbox: document.getElementById('action_mailbox' + id),
        target: document.getElementById('action_target' + id),
        target_area: document.getElementById('action_target_area' + id),
        flags: document.getElementById('action_flags' + id),
        vacation: document.getElementById('action_vacation' + id),
        set: document.getElementById('action_set' + id),
        notify: document.getElementById('action_notify' + id)
      };
  
    if (obj.value == 'fileinto' || obj.value == 'fileinto_copy') {
      enabled.mailbox = 1;
    }
    else if (obj.value == 'redirect' || obj.value == 'redirect_copy') {
      enabled.target = 1;
    }
    else if (obj.value.match(/^reject|ereject$/)) {
      enabled.target_area = 1;
    }
    else if (obj.value.match(/^(add|set|remove)flag$/)) {
      enabled.flags = 1;
    }
    else if (obj.value == 'vacation') {
      enabled.vacation = 1;
    }
    else if (obj.value == 'set') {
      enabled.set = 1;
    }
    else if (obj.value == 'notify') {
      enabled.notify = 1;
    }
  
    for (var x in elems) {
      elems[x].style.display = !enabled[x] ? 'none' : 'inline';
    }
  };
  
  // Register onmouse(leave/enter) events for tips on specified form element
  rcube_webmail.prototype.managesieve_tip_register = function(tips)
  {
    var n, framed = parent.rcmail,
      tip = framed ? parent.rcmail.env.ms_tip_layer : rcmail.env.ms_tip_layer;
  
    for (var n in tips) {
      $('#'+tips[n][0])
        .bind('mouseenter', {str: tips[n][1]},
          function(e) {
            var offset = $(this).offset(),
              left = offset.left,
              top = offset.top - 12,
              minwidth = $(this).width();
  
            if (framed) {
              offset = $((rcmail.env.task == 'mail'  ? '#sievefilterform > iframe' : '#filter-box'), parent.document).offset();
              top  += offset.top;
              left += offset.left;
            }
  
            tip.html(e.data.str)
            top -= tip.height();
  
            tip.css({left: left, top: top, minWidth: (minwidth-2) + 'px'}).show();
          })
        .bind('mouseleave', function(e) { tip.hide(); });
    }
  };
  
  /*********************************************************/
  /*********           Mail UI methods             *********/
  /*********************************************************/
  
  rcube_webmail.prototype.managesieve_create = function()
  {
    if (!rcmail.env.sieve_headers || !rcmail.env.sieve_headers.length)
      return;
  
    var i, html, buttons = {}, dialog = $("#sievefilterform");
  
    // create dialog window
    if (!dialog.length) {
      dialog = $('<div id="sievefilterform"></div>');
      $('body').append(dialog);
    }
  
    // build dialog window content
    html = '<fieldset><legend>'+this.gettext('managesieve.usedata')+'</legend><ul>';
    for (i in rcmail.env.sieve_headers)
      html += '<li><input type="checkbox" name="headers[]" id="sievehdr'+i+'" value="'+i+'" checked="checked" />'
        +'<label for="sievehdr'+i+'">'+rcmail.env.sieve_headers[i][0]+':</label> '+rcmail.env.sieve_headers[i][1]+'</li>';
    html += '</ul></fieldset>';
  
    dialog.html(html);
  
    // [Next Step] button action
    buttons[this.gettext('managesieve.nextstep')] = function () {
      // check if there's at least one checkbox checked
      var hdrs = $('input[name="headers[]"]:checked', dialog);
      if (!hdrs.length) {
        alert(rcmail.gettext('managesieve.nodata'));
        return;
      }
  
      // build frame URL
      var url = rcmail.get_task_url('mail');
      url = rcmail.add_url(url, '_action', 'plugin.managesieve');
      url = rcmail.add_url(url, '_framed', 1);
  
      hdrs.map(function() {
        var val = rcmail.env.sieve_headers[this.value];
        url = rcmail.add_url(url, 'r['+this.value+']', val[0]+':'+val[1]);
      });
  
      // load form in the iframe
      var frame = $('<iframe>').attr({src: url, frameborder: 0})
      dialog.empty().append(frame).dialog('widget').resize();
  
      // Change [Next Step] button with [Save] button
      buttons = {};
      buttons[rcmail.gettext('save')] = function() {
        var win = $('iframe', dialog).get(0).contentWindow;
        win.rcmail.managesieve_save();
      };
      dialog.dialog('option', 'buttons', buttons);
    };
  
    // show dialog window
    dialog.dialog({
      modal: false,
      resizable: !bw.ie6,
      closeOnEscape: (!bw.ie6 && !bw.ie7),  // disable for performance reasons
      title: this.gettext('managesieve.newfilter'),
      close: function() { rcmail.managesieve_dialog_close(); },
      buttons: buttons,
      minWidth: 600,
      minHeight: 300,
      height: 250
    }).show();
  
    this.env.managesieve_dialog = dialog;
  }
  
  rcube_webmail.prototype.managesieve_dialog_close = function()
  {
    var dialog = this.env.managesieve_dialog;
  
    // BUG(?): if we don't remove the iframe first, it will be reloaded
    dialog.html('');
    dialog.dialog('destroy').hide();
  }
  
  rcube_webmail.prototype.managesieve_dialog_resize = function(o)
  {
    var dialog = this.env.managesieve_dialog,
      win = $(window), form = $(o);
      width = $('fieldset:first', o).width(), // fieldset width is more appropriate here
      height = form.height(),
      w = win.width(), h = win.height();
  
    dialog.dialog('option', { height: Math.min(h-20, height+120), width: Math.min(w-20, width+65) })
      .dialog('option', 'position', ['center', 'center']);  // works in a separate call only (!?)
  }
  