var speed = 1000;
var tid = 0;

function dodate()
  {
	tmpDate = new Date();
	Stunden = tmpDate.getHours();
    Minuten = tmpDate.getMinutes();
    Sekunden = tmpDate.getSeconds();
    aktZeit = Stunden;
    aktZeit += ((Minuten < 10) ? ":0" : ":") + Minuten;
    aktZeit += ((Sekunden < 10) ? ":0" : ":") + Sekunden;
 	
	f.date.value=aktZeit;
  	tid=window.setTimeout("dodate()",speed);
  }
function start(x) 
  {
  f=x;
  tid=window.setTimeout("dodate(f)",speed);
  }