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