function digitaluhr() {
   var time=new Date();
   var hour=time.getHours();
   var minute=time.getMinutes();
   var second=time.getSeconds();
   var temp=hour;
   temp+=((minute<10)? ":0" : ":")+minute;
   temp+=((second<10)? ":0" : ":")+second;
   document.getElementById('uhrzeit').innerHTML = temp;
   var id=setTimeout("digitaluhr()",1000);
}