var folderSizeCol = document.getElementById("folderSizeCol");    folderUnreadCol.setAttribute("hidden", "true");    folderTotalCol.setAttribute("hidden", "true");    folderSizeCol.setAttribute("hidden", "true");    folderNameCol.removeAttribute("label");  }  else  {    folderNameCol.setAttribute("label", folderColumnLabel.value);  }  folderNameCol.setAttribute("hideheader", showColumns ? "false" : "true");  var folderTree = document.getElementById("folderTree");  folderTree.setAttribute("hidecolumnpicker", showColumns ? "false" : "true");  var hidden = folderUnreadCol.getAttribute("hidden");  if (hidden != "true")  {    var folderNameCell = document.getElementById("folderNameCell");    folderNameCell.setAttribute("label", "?folderTreeSimpleName");  }} // loadFolderViewForTree -- a helper routine split away from// loadFolderView.// returns a localized string corresponding to the name of the new viewfunction loadFolderViewForTree(aNewFolderView, aFolderTree){  var folderPaneHeader = document.getElementById('folderpane-title');  var database = aFolderTree.database;  var nsIRDFDataSource = Components.interfaces.nsIRDFDataSource;  // Each folder pane view has the following properties:   // ref-> the ref attribute for the folderTree  // label -> the UI label associated with the folder view  // datasources -> array of the data sources associated with the view  var folderViews = [                       {ref:"msgaccounts:/",           label:"folderPaneHeader",           dataSources: [accountManagerDataSource.QueryInterface(nsIRDFDataSource),                                                                                                        folderDataSource.QueryInterface(nsIRDFDataSource)] },                      {ref:"mailnewsunreadfolders:/", label:"folderPaneHeader_unread",    dataSources: [unreadFolderDataSource.QueryInterface(nsIRDFDataSource)]},                      {ref:"mailnewsfavefolders:/",   label:"folderPaneHeader_favorites", dataSources: [favoriteFoldersDataSource.QueryInterface(nsIRDFDataSource)]},                      {ref:"mailnewsrecentfolders:/", label:"folderPaneHeader_recent",    dataSources: [recentFoldersDataSource.QueryInterface(nsIRDFDataSource)]},                    ];  // unload the current data sources  if (gCurrentFolderView != undefined)  {    var dataSourcesToUnload = folderViews[gCurrentFolderView].dataSources;    for (index in dataSourcesToUnload)      database.RemoveDataSource(dataSourcesToUnload[index]);  }  // add the new data sources  var dataSourcesToAdd = folderViews[aNewFolderView].dataSources;  for (index in dataSourcesToAdd)  {    database.AddDataSource(dataSourcesToAdd[index]);    var msgDS = dataSourcesToAdd[index].QueryInterface(Components.interfaces.nsIMsgRDFDataSource);    msgDS.window = msgWindow;  }  aFolderTree.setAttribute('ref', folderViews[aNewFolderView].ref);  return gMessengerBundle.getString(folderViews[aNewFolderView].label);}function loadFolderView(aNewFolderView){  if (gCurrentFolderView && (gCurrentFolderView == aNewFolderView))    return;      var folderTree = GetFolderTree();  var folderPaneHeader = document.getElementById('folderpane-title');  var folderTree = GetFolderTree();  var database = GetFolderDatasource();    // load the folder view into the folder pane  folderPaneHeader.value = loadFolderViewForTree(aNewFolderView, GetFolderTree());    // if the folder location picker is visible, load the folder view into the location  // picker as well.   var folderLocationPicker = document.getElementById('folder-location-container');  if (folderLocationPicker)    loadFolderViewForTree(aNewFolderView, document.getElementById('folderLocationPopup').tree);  // now reflect the new value back into prefs  pref.setIntPref('mail.ui.folderpane.view', gCurrentFolderView = aNewFolderView);}// we can cycle the folder view forward or backwardsfunction CycleFolderView(aCycleForward){  // pass the call onto loadFolderView...  var offset = aCycleForward ? 1 : kNumFolderViews - 1;  loadFolderView((gCurrentFolderView + offset) % kNumFolderViews);}function OnLoadFolderPane(){  UpdateFolderColumnVisibility();  var folderUnreadCol = document.getElementById("folderUnreadCol");  folderUnreadCol.addEventListener("DOMAttrModified", OnFolderUnreadColAttrModified, false);  loadFolderView(pref.getIntPref('mail.ui.folderpane.view'));  var folderTree = GetFolderTree();  var folderTreeBuilder = folderTree.builder.QueryInterface(Components.interfaces.nsIXULTreeBuilder);  folderTreeBuilder.addObserver(folderObserver);  folderTree.addEventListener("click",FolderPaneOnClick,true);  folderTree.addEventListener("mousedown",TreeOnMouseDown,true);}function OnUnloadFolderPane(){  var folderTreeBuilder = GetFolderTree().builder.QueryInterface(Components.interfaces.nsIXULTreeBuilder);  folderTreeBuilder.removeObserver(folderObserver);}// builds prior to 12-08-2001 did not have the labels column// in the thread pane.  so if a user ran an old build, and then// upgraded, they get the new column, and this causes problems.// We're trying to avoid a similar problem to bug #96979.// to work around this, we hide the column once, using the // "mailnews.ui.threadpane.version" pref.function UpgradeThreadPaneUI(){  var threadPaneUIVersion;  try {    threadPaneUIVersion = pref.getIntPref("mailnews.ui.threadpane.version");    if (threadPaneUIVersion < 5) {      var threadTree = document.getElementById("threadTree");              var junkCol = document.getElementById("junkStatusCol");      var beforeCol;      if (threadPaneUIVersion < 4) {        if (threadPaneUIVersion < 3) {                    // in thunderbird, we are inserting the junk column just before the           // date column.           var dateCol = document.getElementById("dateCol");          threadTree._reorderColumn(junkCol, dateCol, true);        }        var senderCol = document.getElementById("senderCol");        var recipientCol = document.getElementById("recipientCol");            threadTree._reorderColumn(recipientCol, junkCol, true);                threadTree._reorderColumn(senderCol, recipientCol, true);      } // version 4 upgrades      // version 5 adds a new column called attachments      var attachmentCol = document.getElementById("attachmentCol");      var subjectCol = document.getElementById("subjectCol");            threadTree._reorderColumn(attachmentCol, subjectCol, true);      pref.setIntPref("mailnews.ui.threadpane.version", 5);    } // version 5 upgrades	}  catch (ex) {    dump("UpgradeThreadPane: ex = " + ex + "\n");  }}function OnLoadThreadPane(){  UpgradeThreadPaneUI();}// folderLocationPickerOnLoad can be called multiple times// and it can be called when the location picker isn't in the toolbarfunction folderLocationPickerOnLoad(){  var folderLocationPicker = document.getElementById('folder-location-container');  if (!folderLocationPicker)     return;    var locationTree = document.getElementById('folderLocationPopup').tree;  locationTree.database.AddDataSource(accountManagerDataSource);  locationTree.database.AddDataSource(folderDataSource);  locationTree.setAttribute("ref", "msgaccounts:/");}function OnLocationTreeSelect(menulist){  SelectFolder(menulist.getAttribute('uri'));}function UpdateFolderLocationPicker(resource){  var folderLocationPicker = document.getElementById('folder-location-container');  if (!folderLocationPicker)     return;    var tree = GetFolderTree();  var folders = document.getElementById('locationFolders');  var properties = ['BiffState', 'NewMessages', 'HasUnreadMessages',                    'SpecialFolder', 'IsServer', 'IsSecure', 'ServerType', 'NoSelect'];  var label = GetFolderAttribute(tree, resource, 'FolderTreeName');  folders.setAttribute("label", label);  for (var i in properties)   {    var property = properties[i];    var value = GetFolderAttribute(tree, resource, property);    folders.setAttribute(property, value);  }  folders.setAttribute('uri', resource.Value);}function GetFolderDatasource(){  var folderTree = GetFolderTree();  return folderTree.database;}/* Functions for accessing particular parts of the window*/function GetFolderTree(){  if (! gFolderTree)    gFolderTree = document.getElementById("folderTree");  return gFolderTree;}function GetSearchInput(){  if (!gSearchInput)    gSearchInput = document.getElementById("searchInput");  return gSearchInput;}function GetMessagePane(){  if (!gMessagePane)     gMessagePane = document.getElementById("messagepanebox");  return gMessagePane;}function GetMessagePaneFrame(){  return window.content;}function FindInSidebar(currentWindow, id){	var item = currentWindow.document.getElementById(id);	if(item)		return item;	for(var i = 0; i < currentWindow.frames.length; i++)	{		var frameItem = FindInSidebar(currentWindow.frames[i], id);		if(frameItem)			return frameItem;	}	return null;}function GetThreadAndMessagePaneSplitter(){	if(gThreadAndMessagePaneSplitter) return gThreadAndMessagePaneSplitter;	var splitter = document.getElementById('threadpane-splitter');	gThreadAndMessagePaneSplitter = splitter;	return splitter;}function GetUnreadCountElement(){	if(gUnreadCount) return gUnreadCount;	var unreadCount = document.getElementById('unreadMessageCount');	gUnreadCount = unreadCount;	return unreadCount;}function GetTotalCountElement(){	if(gTotalCount) return gTotalCount;	var totalCount = document.getElementById('totalMessageCount');	gTotalCount = totalCount;	return totalCount;}function IsMessagePaneCollapsed(){  return GetMessagePane().collapsed;}function IsFolderPaneCollapsed(){  return GetFolderTree().parentNode.collapsed;}function FindMessenger(){  return messenger;}function ClearThreadPaneSelection(){  try {    if (gDBView) {      var treeView = gDBView.QueryInterface(Components.interfaces.nsITreeView);      var treeSelection = treeView.selection;      if (treeSelection)         treeSelection.clearSelection();     }  }  catch (ex) {    dump("ClearThreadPaneSelection: ex = " + ex + "\n");  }}function ClearMessagePane(){  if(gHaveLoadedMessage)  {    gHaveLoadedMessage = false;    if (GetMessagePaneFrame().location.href != "about:blank")        GetMessagePaneFrame().location.href = "about:blank";    // hide the message header view AND the message pane...    HideMessageHeaderPane();    gMessageNotificationBar.clearMsgNotifications();    ClearPendingReadTimer();  }}function GetSelectedFolderIndex(){    var folderTree = GetFolderTree();    var startIndex = {};    var endIndex = {};    folderTree.view.selection.getRangeAt(0, startIndex, endIndex);    return startIndex.value;}// Function to change the highlighted row to where the mouse was clicked// without loading the contents of the selected row.// It will also keep the outline/dotted line in the original row.function ChangeSelectionWithoutContentLoad(event, tree){    var treeBoxObj = tree.treeBoxObject;    var treeSelection = treeBoxObj.view.selection;    var row = treeBoxObj.getRowAt(event.clientX, event.clientY);    // make sure that row.value is valid so that it doesn't mess up    // the call to ensureRowIsVisible().    if((row >= 0) && !treeSelection.isSelected(row))    {        var saveCurrentIndex = treeSelection.currentIndex;        treeSelection.selectEventsSuppressed = true;        treeSelection.select(row);        treeSelection.currentIndex = saveCurrentIndex;        treeBoxObj.ensureRowIsVisible(row);        treeSelection.selectEventsSuppressed = false;        // Keep track of which row in the thread pane is currently selected.        if(tree.id == "threadTree")          gThreadPaneCurrentSelectedIndex = row;    }    event.stopPropagation();}function TreeOnMouseDown(event){    // Detect right mouse click and change the highlight to the row    // where the click happened without loading the message headers in