hover = function() {
	var nav = document.getElementById("nav");
	if(nav){
		var nodes = nav.getElementsByTagName("li")
		for (var i=0; i<nodes.length; i++) {
			nodes[i].onmouseover=function() {
				this.className+=" hover";
			}
			nodes[i].onmouseout=function() {
				this.className=this.className.replace(new RegExp(" hover\\b"), "");
			}
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", hover);