IE 7 RC 1 and scrolling div. Need Help ASAP!!

I've got a problem with IE 7 RC 1 and my web site. I open my web site in a tab and then open another tab and go anywhere (Yahoo or Google). I sit on that tab for a while and then go back to my web site. The table expands and looks awful.

I've included the link to the one of the pages with the problem.

http://www.barryandrebecca.com/favorites.cfm

Look at the source and see if you can figure it out.