How to get ControlID through Javascript in Content Pages

[kewldudehere]

Hi folks,

I have a content Page and have the following Code in the content tag.

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

<input type="Text" name="timestamp" value=""/>

<a href="javascript:show_calendar('document.form1.Con tentPlaceHolder1.timestamp',document.form1.Content PlaceHolder1.timestamp.value);"><img src="cal.gif" width="16" height="16" border="0" alt="Click Here to Pick up the timestamp"/></a>

</asp:Content>

I am trying to get the text box id "timestamp" at runtime and pass to the function show_calendar.

But i am getting Runtime error as ''document.form1.ContentPlaceHolder1.timestamp' is null or not an object.

If it was just an ordinary form , then the 'document.form1.timestamp' is working fine but i am trying to access in content pages as 'document.form1.ContentPlaceHolder1.timestamp' which is not working.

What is the correct syntax for this?

Thanks in advance