How to make the Ajax Calendar Extender in a fixed position when a user scrolls down the page?

Question

Hi,

In my screen, im using the AJAX Calendar Extender. In that, I'm facing a problem in my page, while scrolling down the page using mouse, the calendar control is also coming down as per the mouse scrolls. I just want to make the calendar control to b fixed or invisible when the users scrolls down the page.

Can any one help me in this regard?

Thanks.