var actief_li = -1;

sfHover = function() {
	var sfEls = document.getElementById("menu").getElementsByTagName("li");
	for (var i=0; i<sfEls.length; i++) {
		if(sfEls[i].parentNode.parentNode.parentNode.parentNode.id == "menu") {
			sfEls[i].nodeid = i;
			sfEls[i].firstChild.onmousedown=function() {
				if(this.parentNode.className.indexOf("selected_productgroup") != -1) {
					this.parentNode.className = this.parentNode.className.replace(" selected_productgroup", "");
					actief_li = -1;
				}
				else {
					if(actief_li != -1) {
						sfEls[actief_li].className = this.parentNode.className.replace(" selected_productgroup", "");
					}
					this.parentNode.className += " selected_productgroup";
					actief_li = this.parentNode.nodeid;
				}
			}
		}
		if(sfEls[i].className.indexOf("selected_productgroup") != -1) {
			actief_li = sfEls[i].nodeid;
		}
		
	}
}

function init() {
	sfHover();
}