var aktiv = window.setInterval("bewegemenue()", 25);

function bewegemenue() {
	y = window.pageYOffset;
	if (y == undefined) {
		y = document.documentElement.scrollTop;
	}
	
	if (document.getElementById("submenu")) {
		document.getElementById("submenu").style.top = (y + 30) + "px";
	}
	//document.getElementById("menu").style.top = (y) + "px";
}