xdrop = function() {
	if (document.all&&document.getElementById) {
		for (n=1;document.getElementById("nav"+n)!=null;n++)
		{
				navRoot = document.getElementById("nav"+n);
				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=xdrop;