Change a dynamically resizing page into a centered page

Look at? [login to view URL] I no longer want this page to dynamically resize in width, only in height. I want you to quote for modding the code so I end up with a fixed width page - 1000px wide, floating in the middle of the web browser window BUT the height must remain dynamic and change according to the height of the browser window. Just supply the revised css and or html for the main page and I will update the rest... ## Deliverables I need this very quickly - probably 24 hrs...