Solved: total time | Experts Exchange

I have the following code here I was wondering how would i have a label that would calculate the total time of all the timers running.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script language="javascript">
$(document).ready(function () {
	$("#btn1Start").click(function () {
		timer1 = setInterval("$.do_time('timer1')", 1000);
		$(this).attr("disabled", true);
	});
	$("#btn2Start").click(function () {
		timer2 = setInterval("$.do_time('timer2')", 1000);
		$(this).attr("disabled", true);
	});
	$("#btn3Start").click(function () {
		timer3 = setInterval("$.do_time('timer3')", 1000);
		$(this).attr("disabled", true);
	});
});
//Timer JQuery function
(function ($) {
	$.do_time = function(timerID) {
		
		var time = ($("#" + timerID).html()).split(':');
		var hour = parseInt(time[0], 10);
		var minute = parseInt(time[1], 10);
		var second = parseInt(time[2], 10) + 1;
		
		if (second > 59) {
			second = 0;
			minute++;
		}
		if (minute > 59) {
			minute = 0;
			hour++;
		}
		$("#" + timerID).html((hour>9?hour:'0'+hour) +':'+ (minute>9?minute:'0'+minute) +':'+ (second>9?second:'0'+second));
	} //End Doo time function
})(jQuery);
</script>
</head>
<body>
<table width="160">
   <tr>
      <td id="timer1">00:00:00</td>
      <td><input type="button" id="btn1Start" value="button1" /></td>
   </tr>
   <tr>
      <td id="timer2">00:00:00</td>
      <td><input type="button" id="btn2Start" value="button2" /></td>
   </tr>
   <tr>
      <td id="timer3">00:00:00</td>
      <td><input type="button" id="btn3Start" value="button3" /></td>
   </tr>
</table>
</body>
</html>
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