function display_c(start){
  window.start = parseFloat(start);
 var end = 0 // change this to stop the counter at a higher value
   var refresh=1000; // Refresh rate in milli seconds
if(window.start >= end ){
  mytime=setTimeout('display_ct()',refresh)
}
}

function display_ct() {
   // Calculate the number of days left
   var days=Math.floor(window.start / 86400); 
   // After deducting the days calculate the number of hours left
   var hours = Math.floor((window.start - (days * 86400 ))/3600)
   // After days and hours , how many minutes are left 
   var minutes = Math.floor((window.start - (days * 86400 ) - (hours *3600 ))/60)
   // Finally how many seconds left after removing days, hours and minutes. 
   var secs = Math.floor((window.start - (days * 86400 ) - (hours *3600 ) - (minutes*60)))

   days = '' + days;
   if (days.length == 1)
      days = '0' + days;

   hours = '' + hours;
   if (hours.length == 1)
      hours = '0' + hours;


   minutes = '' + minutes;
   if (minutes.length == 1)
      minutes = '0' + minutes; 

   secs = '' + secs;
   if (secs.length == 1)
      secs = '0' + secs; 

  var x = days + "   " + hours + "   " + minutes + "   " + secs;
   
   document.getElementById('ct').innerHTML = x;
   window.start= window.start- 1;

 tt=display_c(window.start);
}