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);