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)
}