Bottom aligned page in CSS - How?

Hi!

I've been trying for several hours, but I have no more ideas how to do it.
I'd like to have my page aligned to the bottom of the screen. Any
suggestions? 

All my ideas works goood only when the page's height is less than the
screen's height, but some of my subpages are higher.

Thanks in advance!

--
  Mateusz 'PoLu' Pohl