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);