How do you make a div 100% page height?

[Gunbuster]

Hi all,
how do you make a div 100% of page height and with a minimum of 100% of screen height? I'm attempting this in Transitional 4.01 HTML and CSS2.
Any help from the gurus here would be greatly appreciated.

[Kezzer]

You have to set it for the whole body unfortunately, it's really annoying. body { background: url(blah.jpg) repeat whatever etc.

[Gunbuster]

My site structure is roughly like this:
HTML
BODY - background clouds
DIV ID=center - background colums
content here
/DIV
/BODY
/HTML

I've tried using HTML with one background and BODY with another (repeat-y center), but when you scroll beyond the screen size it still just finishes reapeating the background and ignores the page height.
my work in development site is http://www.steelskin.net/wordpress/

p.s. thanks Kezzer