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);