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