function counter() {
  		var aktuell = new Date();
  		var ziel = new Date(2006,8,24,09,00,00);
  		var count = ziel.getTime() - aktuell.getTime();
  		
  		var tage = Math.floor(count / (60 * 60 * 24 *1000));
  		var st = Math.floor((count / (60 * 60 * 1000)) - (tage * 24));
  		var min = Math.floor((count / (60 * 1000)) - (tage * 24 * 60) - (st * 60));
  		var sek = Math.floor((count / 1000) - (tage * 24 * 60 * 60) - (st * 60 * 60) - (min * 60));

  		document.getElementById("block").innerText = tage + ":" + st + ":" + min + ":" + sek; 
  		}
  		
  		var aufruf = window.setInterval("counter()", 500);