var TimerID=null;
var elId = null;

function StartClock(param){
  elId = param;  
  TimerID=setTimeout("ShowClock()",1000);
}
 
function ShowClock(){

	   var today=new Date();
     var display_value ="   " + today.getHours()
     if(today.getMinutes() < 10){ 
        display_value+=":0" + today.getMinutes();
     }
     else{
        display_value+=":" + today.getMinutes();
     }
     if (today.getSeconds() < 10){
        display_value+=":0" + today.getSeconds();
     }
     else{
        display_value+=":" + today.getSeconds();
     }
	  document.getElementById(elId).innerHTML=" "+display_value;

		TimerID=setTimeout("ShowClock()",1000);
	
}