CSS div height thingie

Um…ahem. ok

Suppose I have this page that has two divs, one on top of the other. The one on top is 200px high. Is there anyway i can use css to make the bottom div stretch all the way down to the bottom of the browser, but not below that? I want to vertically center the content in the bottom div, but i tried using height:100%, and it actually goes 200px below the browser, since the top div uses 200px… :frowning:

Can anyone help me?