var folderClosed = new Image(16,16);
folderClosed.src='/style/lze/16/html-menu-treeview/folderClosed.gif';
var plusNode = new Image(16,16);
plusNode.src='/style/lze/16/html-menu-treeview/plusNode.gif';
var lastPlusNode = new Image(16,16);
lastPlusNode.src='/style/lze/16/html-menu-treeview/lastPlusNode.gif';