var clockObj;
 function initClock()
 {
   document.write("<span id='clockInitialization'></span>");
   clockObj = document.getElementById('clockInitialization');
   clockFunction();
 }

 function clockFunction(){
  var data = new Date();
  var hours = data.getHours();
  var mins   = data.getMinutes();
  var seconds = data.getSeconds();
  
  if(hours < 10) hours = "0" + hours;
  if(mins < 10) mins = "0" + mins;
  if(seconds < 10) seconds = "0" + seconds;
  
  var time = hours + ":" + mins + ":" + seconds;
  
  clockObj.innerHTML = time;
  
  setTimeout("clockFunction()",1000);
  
  
 }
 initClock();