hoofdmenu = function() {
	menu = document.getElementById("hoofdmenu");
	
	for( i=0; i < menu.childNodes.length; i++ ) {
		node = menu.childNodes[i];

		if( node.nodeName == "LI" ) {
			node.onmouseover=function() {
				this.className = "over";
			}

			node.onmouseout=function() {
				this.className = '';
			}
		}
	}
}

hoofdmenuIntern = function () {
	menu = document.getElementById( "hoofdmenu" );
	uls = menu.getElementsByTagName( "ul" );
	for( i=0; i < uls.length; i++ ) {
		node = uls[i];

		node.onmouseover=function() {
			this.parentNode.className="over";
		}

		node.onmouseout=function() {
			this.parentNode.className = '';
		}
	}
	
}

Event.observe(window, 'load', hoofdmenu );
Event.observe(window, 'load', hoofdmenuIntern );