I found a useful Javascript countdown clock written by Robert Hashemian and modified by Munsifali Rashid. Download the countdown.js @ JavaScript Countdown/Count-up Timer/Clock/Ticker for Web Pages and try the following example.
<html>
<head>
<title>Countdown</title>
<script language="javascript" src="countdown.js"></script>
<script language="javascript">
var cd1 = new countdown('cd1');
cd1.Div = "clock1";
cd1.TargetDate = "11/7/2011 12:00 AM";
cd1.DisplayFormat = "%%D%% days, %%H%% hours, %%M%% minutes, %%S%% seconds until event Tinyan's birthday";
</script>
</head>
<body>
<div id="clockwrapper"><div id="clock1">[clock]</div></div>
<script language="javascript">
<!--
cd1.Setup();
//-->
</script>
</body>
</html>
Done =)
Reference: JavaScript Countdown/Count-up Timer/Clock/Ticker for Web Pages
Eureka! 