startList = function() {
var nodes = document.getElementById("nav").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);