Changing this clock to show user's local time

[Emeralda]

http://img715.imageshack.us/img715/8...e6cb9188f3.png

<div style="top:50px;right:100px;position:absolute;display:none">
<script src="http://www.clocklink.com/embed.js"></script><script type="text/javascript" language="JavaScript">obj=new Object;obj.clockfile="5005-white.swf";obj.TimeZone="GMT";obj.width=120;obj.height=40;obj.wmode="transparent";showClock(obj);</script>
</div>

Basically, the current clock is showing only a set one GMT, but I'd like it to function like this one: https://vborg.vbsupport.ru/showthrea...ighlight=clock where it shows the user's current local time. I know it's possible, I saw it in action, but yeah, I have no idea how it's done, the code was totally too difficult for me >.<