window.addEvent("domready", function() {
		var dropdowns = $$("div.dropdown");
		dropdowns.each(function(dropdown) {
			dropdown.addEvent("click", function() {
				var lists = this.parentNode.getElements("ul");
				if (lists.length > 0) {
					if (this.parentNode.className.indexOf("opened") == -1)
						this.parentNode.addClass("opened");
					else
						this.parentNode.removeClass("opened");
				}
			});
		});
	});