Im Having DIV problems with Height

[susapra]

Hi,
I just started messing with dreamweaver for like week.
Well, this is what I have so far:
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The black part is a div. I want the bottom of the black part to always touch the bottom of the page. Like if someone had a big screen, I want the black part to be always connected to the bottom of the page. How do I do that?

I tried:
-http://www.wickham43.supanet.com/tutorial/fullheightdiv.html
But when I put "html, body { height: 100%; margin: 0; }" inside the html, its just plain text, and not coding, so it doesnt do anything.

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