sec = 0;
min = 0;
hour = 0;

function stopwatch(clock_id) 
{
  if($(clock_id))
	{
	  sec++;
		if (sec == 60) 
		{
			sec = 0;
			min = min + 1; 
		}
		else 
		{
			min = min; 
		}
		if (min == 60)
		{
			min = 0; 
			hour += 1; 
		}
	
		if (sec<=9) 
		{ 
			sec = "0" + sec; 
		}
		now =  ( (hour<=9) ? "0" + hour : hour) + ":" + ( (min<=9) ? "0" + min : min) + ":" + sec;
		$('#' + clock_id).html(now)
		my_timer = window.setTimeout("stopwatch('" + clock_id + "');", 1000);	
  
  }
	
}