function hideSelects(){
	var selectVar = document.getElementsByTagName("select");
		for (var i=0; i<selectVar.length; i++) {
			selectVar[i].style.visibility = "hidden";
		}
}

function showSelects(){
	var selectVar = document.getElementsByTagName("select");
		for (var i=0; i<selectVar.length; i++) {
			selectVar[i].style.visibility = "visible";
		}
}

sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
			hideSelects();
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
			showSelects();
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);