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);