CollapsibleNav = Class.create(Navigation,
{
	initialize: function($super, element)
	{
		$super(element);
	},
	_initItem: function($super, item)
	{
			this.closeItem(item);
			item.onclick = item.onmouseout = item.onmouseover = function(evt){
				document.fire(evt.target.id + ":" + evt.type, evt);
			};
	}
});