固定标题和100％内容高度的CSS布局？

I'm trying to get a fixed height header and a content area the fills the screen. The content div contains a telerik mvc grid. I've tried a few suggested on stackoverflow but the control that is the content area always seems to size incorrectly because it doesn't take into account the header fixed height, so it will scroll the extra 40px if the header is 40px. Any suggestions? I'm trying to get a fixed height header and a c