Hi there "dancing-mathilde"..
Im not too sure what it is your trying to say, but from the looks of things you are trying to create a "1 colum, 3 rowed" design. This would accoutn for a header image, and main content image, and a footer.
If you wish to bring this into CSS rather then using a table, you will need to do the following.
First, Create your overall container, This is 1 Big DIV that all your other "Divs" sit inside. With this container, you can specify the size of your webpage allowing you to cater for smaller resolutions.
Once you've created your main container DIV, you will need to create your 3 content Divs's.
You will end up with something like this ...
Obviously, to get your "Div's" inline, you are going to need to write your style sheet. If you know your CSS this will be a relatively easy layout.
If not, may i advise that you visit w3schools.com or pixel2life.com
Both of these websites have great CSS tutorial sections.
I hope this has helped