100% height

[1901gt]

I have a footer and a header and a two column body using css.
The width is fixed at 700px. But how do I set the height to 100%, making the footer sitting right at the bottom of the browser and the body stretching 100% from top to bottom although its filled with minimum text?
Padding and Margin set to 0.

 

[cef]

Take a look here: http://www.xs4all.nl/~peterned/examples/csslayout1.html

(not my site, but I've used the code from there and it works well)