[css-d] Problems with automatic div sizing

I have problems with this http://gizmo.sp-online.de/test.html under Firefox 1.07/Ubuntu and Opera 8.51/Ubuntu. The red-bordered div does not grow in size although the main and nav div are inside. So I can not put the footer div under the main_container div. It always apear under the main

[css-d] whats your favorite way to test your stylesheets?

I mostly work on my Tecra Notebook running Ubuntu/Linux and I develop my sites with Quanta, BLuefish, Kate, Smarty, PHP, MySQL. I started to use CSS more extensive as I got a book (http://css-praxis.de) and read what is possible with css. I read a lot of browser specific problems and