startList = function() {	
	navRoot = document.getElementById("nav");
	for (i=0; i<navRoot.childNodes.length; i++) {
		node = navRoot.childNodes[i];
		if (node.nodeName=="LI") {
			node.onmouseover=function() {
			this.className+="over";
			
			}
			node.onmouseout=function() {
			this.className=this.className.replace("over", "");
			}
		}
	}
}

window.onload=startList;