Can we fix the column headers of a table placed in a scroll container?

Hi

I have a big table placed inside a scroll container.

The table is so big that both horizontal and vertical scroll bars appears always.

So what happens is...

when the user moves the vertical scrollbar down, the column headers move

up,so that they are no visible, when he reaches the bottom of the table.

What is our requirement is, even if the user moves the vertical scrollbars the headers should be visible.

Can anybody solve this problem??

Thanks

Smitha