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

window.onload=startList;