Javascript 24 hour clock

A snippet for a javascript clock showing time in 24 hours with seconds

<script type="text/javascript">
  var tick;
  function stop() {
  clearTimeout(tick);
  }
  function clock() {
  var ut=new Date();
  var h,m,s;
  var time="        ";
  h=ut.getHours();
  m=ut.getMinutes();
  s=ut.getSeconds();
  if(s<=9) s="0"+s;
  if(m<=9) m="0"+m;
  if(h<=9) h="0"+h;
  time+=h+":"+m+":"+s;
  document.getElementById('clock').innerHTML=time;
  tick=setTimeout("clock()",1000); 
  }
</script>
<body  onload="clock();" onunload="stop();"> 

<p><span id="clock"></span></p>

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