var timer=null;

function stop()
{
clearTimeout(timer);
}

function start()
{
var time=new Date();
var hours=time.getHours();
var minutes=time.getMinutes();
minutes=((minutes < 10) ? "0" : "") + minutes;
var seconds=time.getSeconds();
seconds=((seconds < 10) ? "0" : "") + seconds;
var clock=hours + ":" + minutes + ":" + seconds;
document.forms[0].display.value=clock;
timer=setTimeout("start()",1000);
}