tried this code instead

<script type="text/javascript>
<!--
function myClock() { 
for(hh=0;hh<24;hh++){
for (mm=0;mm<60;mm++){
for (ss=0;ss<60;ss++){
document.write(String.format("%02d:%02d:%02d",hh,mm,ss))
document.d.d2.value=String.format("%02d:%02d:%02d",hh,mm,ss)
ss++
setInterval("myClock()",1000)
}
}   
}
}
//-->
</script>