topsfHover = function() {
	var topsfEls = document.getElementById("top_nav").getElementsByTagName("LI");
	for (var i=0; i<topsfEls.length; i++) {
		topsfEls[i].onmouseover=function() {
			this.className+=" topsfhover";
		}
		topsfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" topsfhover\\b"), "");
		}
	}
}
//if (window.attachEvent) window.attachEvent("onload", topsfHover);
if (document.all) { //MS IE
	if (window.attachEvent) window.attachEvent("onload", topsfHover);
	else { //IE 5.2 Mac does not support attachEvent
		var alte = window.onload;
		window.onload = function() { if (alte) alte(); topsfHover(); }
	}
}