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