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);