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