Time Count Display in asp 2.0

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ASP.NET

If the User Start to Fill the Form the Time Starts from 00:00:01 to continuously... Its been Clearly performed By using Javascript:

<script language="JavaScript" type="text/javascript">

var c = 0;
var m = 0;
var h = 0;
var t;
var timer_is_on = 0;

function timedCount()
{
    document.getElementById('lblsec').innerHTML = c;
    document.getElementById('lblmins').innerHTML = m + ' : ';
    document.getElementById('lblhrs').innerHTML = h + ' : ';
    c = c + 1;

    if(c > 59)
    {
        m = m + 1;
        c = 0;
        if(m > 59)
        {
            h = h + 1;
            m = 0;
        }
    }
    t = setTimeout("timedCount()", 1000);

}

function doTimer()
{
    if (!timer_is_on)
    {
        timer_is_on = 1;
        timedCount();
    }
}

window.onload = doTimer;

</script>

This Script is Clearly Working....
My Big Issue is..

I have Three LinkButtons , if i Click any Link Button the Whole Page is Reloading and also the time is reset and starts from 00:00:01...

Can anyone help me..

Regards,
Prince Antony G