Thanks evrybody for your replies !!!!

It helped [:)]

Whoops...looks like I trimmed the full name of the function as I was using gdrp_getComboById rather than igdrp_getComboById.  After this change, we now have a reference to the WebDateChooser control. 

Thanks for this info, Sum Kim.

We have a WebDateChooser control on a Panel in a Master Page.  Given the following code...

<script type="text/javascript">

window.onload=activate;

function activate() 
{
    alert ('<%= wdcDateOfBirth.ClientID %>');
    var dateChooser = gdrp_getComboById('<%= wdcDateOfBirth.ClientID %>');
}

</script>

The alert call is returning a ClientID of ctl00xContentPlaceHolder2xWebPanel5xwdcDateOfBirth.  However, the gdrp_getComboById call is leading to an 'Object Expected' error.  Is there something we're missing here?

Also, once we have the WebDateChooser object, what is the easiest way to set a new date for this control on the client side.  For example, would the following work?

dateChooser.SetValue("2008-5-5");

Thanks in advance