Скрипт такой:
<script type="text/javascript">
$(
function() {
$("#menu-level-1> a.item, a.item-selected").hover(
function(){
var elm = "#light #menu-level-2-"+$(this).attr("id");
$(elm).css("top",$("#menu-container > #dark ").offset().top + $("#menu-container > #dark").height()-2);
$(elm).css("left",$(this).offset().left);
if(this.className ="item")
this.className = this.className.replace("item","item-selected");
$(elm).css("display","inline");
//$(elm).css("visibility","visible");
},
function(){
var elm = "#light #menu-level-2-"+$(this).attr("id");
$(elm).css("display","inline");
}
);
</script>