margin: 0 auto does not working

[affisdist]

I've read alot about this problem and I think I make everything right, but something is missing. Here is my code: \[code\]<div id="text">some text</div> #text {margin: 0 auto; width: 1000px; display: block; font-size: 24px; color: #000;}\[/code\]http://jsfiddle.net/yKBQD/