sfHover = function() {
	var sfTopEls = document.getElementById("topnav").getElementsByTagName("li");
	for (var i=0; i<sfTopEls.length; i++) {
		sfTopEls[i].onmouseover=function() {
			if (document.all) this.className+=" sfTopHover";
		}
		sfTopEls[i].onmouseout=function() {
			if (document.all) this.className=this.className.replace(new RegExp(" sfTopHover\\b"), "");
		}
	}
	var sfBotEls = document.getElementById("botnav").getElementsByTagName("li");
	for (var i=0; i<sfBotEls.length; i++) {
		sfBotEls[i].onmouseover=function() {
			if (document.all) this.className+=" sfBotHover";
		}
		sfBotEls[i].onmouseout=function() {
			if (document.all) this.className=this.className.replace(new RegExp(" sfBotHover\\b"), "");
		}
	}  
}

function addEvent(obj, evType, fn){
 if (obj.addEventListener){
   obj.addEventListener(evType, fn, true);
   return true;
 } else if (obj.attachEvent){
   var r = obj.attachEvent("on"+evType, fn);
   return r;
 } else {
   return false;
 }
}

addEvent(window, 'load', sfHover);