onload=function() {
	function topnav() {
		var top_links=document.getElementById("top-nav").getElementsByTagName("a");
		for (var i=0, curr; curr=top_links[i]; i++) {
			addEvent(top_links[i], "mouseover", function() {this.parentNode.className="active"});
			addEvent(top_links[i], "mouseout", function() {this.parentNode.className=""});
		}
	}
}
function addEvent(obj, type, fn) {
	if (obj.addEventListener)
		obj.addEventListener(type, fn, false);
	else if (obj.attachEvent) {
		obj["e"+type+fn]=fn;
		obj[type+fn]=function() {obj["e"+type+fn](window.event);}
		obj.attachEvent("on"+type, obj[type+fn]);
	}
}