startList = function() {

var nodes = document.getElementById("ul_menu").getElementsByTagName("LI");
for (var i=0; i<nodes.length; i++) {
	nodes[i].onmouseover = function() {
		this.className += " over";
		}

	nodes[i].onmouseout = function() {
		this.className = this.className.replace(new RegExp(" over\\b"), "");
		}
	}
}

if (window.attachEvent) window.attachEvent("onload", startList);