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var starttime=0;
var timer=NULL;
function startCounter(){
var dat=new Date();
starttime=dat.getTime();
timer = window.setTimeout("updateCounter(2)",100);
}
function stopCounter(){
window.clearTimeout(timer);
updateCounter(1);
}
function updateCounter(a)
{
var dat = new Date();
now=dat.getTime();
var dif=now-starttime;
var difstunden=Math.floor(dif/(1000*60*60));
dif=dif-(difstunden*(1000*60*60));
var difminuten=Math.floor(dif/(1000*60));
dif=dif-(difminuten*(1000*60));
var difsekunden=Math.floor(dif/(1000));
dif=dif-(difsekunden*(1000));
var difmili=Math.floor(dif);
document.getElementById("ausgabe").innerHTML=difstunden+":"+difminuten+":"+difsekunden+":"+difmili;
if(a==2)
{
timer=window.setTimeout("updateCounter(2)",500);
}
}
</script>
<html>
<body>
<p id="ausgabe"></p>
<input type="button" onclick="startCounter()" value="start"></input>
<input type="button" onclick="stopCounter()" value="stopp"></input>
</body>
</html>
