<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                                "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<script type="text/javascript">
function $(id){
    return document.getElementById(id);
 }
var time = 24*60*60;   
  
 function changeTime(){
    time = time-1;   
    var hours = Math.floor(time/(60*60));   
    hours = (hours>9?hours:('0'+hours))
    var minitus = Math.floor(time/60%60);
    minitus = (minitus>9?minitus:('0'+minitus))
    var seconds =Math.floor(time%60%60);
    seconds = (seconds>9?seconds:('0'+seconds));
    $('time').innerHTML = hours +':'+minitus +':'+seconds ;   
       
 }   
 setInterval('changeTime()',1000);
</script>  
</head>  
<body>  
<div style='font-size:111px' id='time'></div>