Keeping div tags in page?

Hi,

How would I keep a floating div tag inside the page when the user resizes the browser?

When I click a certain button, I show a div rect and position the rect at the bottom left of the button. The problem being that the button might be at the far right of the page. If this is the case, the rect must position its top right to the bottom right of the button.

Simply put, I realy just need to know how how much space there is in the browser. I can get the width and height of the screen in total, but not the size of the inner browser or document for that matter. I already know how to move the rect.

Well Lee posted some stuff a couple of threads down at http://www.vbforums.com/showthread.php?threadid=174274 maybe that will help you.