sfHover = function() {
			var sfEls = document.getElementById("mainNav").getElementsByTagName("li");
			for (var i=0; i<sfEls.length; i++) {
				sfEls[i].onmouseover=function() {
					sel = document.getElementsByTagName("select");
					for (var i=0; i<sel.length; i++) {
						sel[i].style.visibility = 'hidden';	
					}
					this.className+=" sfhover";
				}
				sfEls[i].onmouseout=function() {
					sel = document.getElementsByTagName("select");
					for (var i=0; i<sel.length; i++) {
						sel[i].style.visibility = 'visible';	
					}
					this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
				}
			}
		}
	// only win:
	if (window.attachEvent) window.attachEvent("onload", sfHover);