function initMenu() {
	if (document.all&&document.getElementById) {
		var navRoot=document.getElementById('topNav');	
		var nodes=navRoot.getElementsByTagName('li');
		for (i=0;i<nodes.length;i++) {
			var node=nodes[i];				
			node.onmouseover=function() {
				this.className+=(this.className!="")?' over':'over';
			}				
			node.onmouseout=function() {
				this.className=(this.className=="over")?'':this.className.replace(' over', ''); 
			}
		}
	}
}

window.onload=initMenu