CSS positioning help

Hello everyone,

I'm working on an HTML/CSS portoflio website for my exam project and I'm facing some trouble with positioning of the different elements.

First of all, here's the site: www.kristianmaar.dk/portfolio (validates fine except for CSS3)

I want the #footer to position 20px below the #main-content-wrapper but since I've had difficulties with that using absolute/relative positioning I'm now positioning the footer elements with margin-top on the individual pages.

I'm only testing in Firefox/Safari/Chrome, latest versions.

Any suggestions?

//Maar