I need to recreate a flash page for someone and I'm wonder what the best way to do this would be.

the layout is pretty much done, but how should i go about doing the gray on both sides. The page will be centered and the gray in the middle will expand with your resolution. However, the dark gray on the right is throwing a wrench in my plans. I figure I need to use a background image in some way, but I can't get anything to work properly