stopwatch counter in jquery

var currentHours = 0;
var currentMinutes = 0;
var currentSeconds = 0;
currentMinutes = ( currentMinutes < 10 ? "0" : "" ) + currentMinutes;
currentHours = ( currentHours < 10 ? "0" : "" ) + currentHours;
 
function updateClock ( )
	{
 
  	currentSeconds++;
 
        if(currentSeconds >59)
  	{
  	currentMinutes++;
  	currentSeconds = 0;
  	currentMinutes = ( currentMinutes < 10 ? "0" : "" ) + currentMinutes;
  	}
  	if(currentMinutes >59)
  	{
  	currentHours++;
  	currentMinutes =0;
  	}
 
 
 
	currentSeconds = ( currentSeconds < 10 ? "0" : "" ) + currentSeconds;
 
	// Compose the string for display
  	currentTimeString = currentHours + ":" + currentMinutes + ":" + currentSeconds;
 
  	$("#clock").html(currentTimeString);
 
}
 
$(document).ready(function()
{
   setInterval('updateClock()', 1000);
});