how does this css footer stay at the bottom [duplicate]

This question already has answers here: 开发者_StackOverflow中文版 Closed 11 years ago.

Possible Duplicate:

How do you get the footer to stay at the bottom of a Web page?

how does this site keep the footer at the bottom when the content is short?

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You can use a sticky footer solution like http://ryanfait.com/sticky-footer/ or http://www.cssstickyfooter.com/

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 #footer{
    position:absolute;
    bottom:0;
 }

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First of all, warn before putting a man's butt on the screen. Second, use firebug. Third, its called position: absolute.