function show_menue(id) {
	menu = document.getElementById('menu'+id);
	if(menu) {
		menupunkt = document.getElementById('menupunkt'+id);
		menupos = document.getElementById('nav-top');
		
		menu.style.left = (menupunkt.offsetLeft + getPosition(menupos).x -1) + 'px';
		menu.style.visibility = 'visible';
		
		if(navigator.appName == 'Microsoft Internet Explorer' && menu.offsetHeight) {
			menuabdecker.style.top = '136px';
			menuabdecker.style.left = menu.offsetLeft + 'px';
			menuabdecker.style.height = (menu.offsetHeight - 1) + 'px';
			menuabdecker.style.width = menu.offsetWidth + 'px';
			menuabdecker.style.visibility = 'visible';
		}
	}
}
function hide_menue(id) {
	menu = document.getElementById('menu'+id);
	if(menu) {
		menu.style.visibility = 'hidden';
		menuabdecker = document.getElementById('menue_abdecker');
		menuabdecker.style.visibility = 'hidden';
	}
}

// der Aufruf dieser Funktion ermittelt die absoluten Koordinaten des Objekts element
function getPosition(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	position=new Object();
  position.x=curleft;
  position.y=curtop;
  return position;
}