I've got a small problem, I want my footer to stay at the bottom of the screen with position: absolute. But my margin: auto to put it in the middle of the screen isn't working anymore.

html:

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv='Content-Type' content='Type=text/html; charset=utf-8'>
        <link rel="shortcut icon" href="../IMAGES/favicon.ico">
        <title>TEST</title>
        <link href='http://fonts.googleapis.com/css?family=Source+Sans+Pro' rel='stylesheet' type='text/css'>
        <link rel="stylesheet" href="../css/stylesheet.css">
    </head>
    <body>
        <div id="header">
            <div id="logo">
                <img src="../IMAGES/logo.png" />
            </div>
            <div id="logotitel">
                Den Allerstrafste "Ful-Ambi" Live-Band van groot Antwerpen en omstreken!
            </div>
        </div>
        <div id="nav">
            <div id="links">
                <a href="index.php"><div class="link">Home</div></a>
                <a href="wie.php"><div class="link">Wie is wie</div></a>
                <a href="fotos.php"><div class="link">Foto's</div></a>
                <a href="repertoire.php"><div class="link">Repertoire</div></a>
                <a href="links.php"><div class="link">Links</div></a>
                <a href="contact.php"><div class="link">Contact</div></a>
            </div>
        </div>
        <div class="clear"></div>
        <div id="content">
            TEST
        </div>
        <div class="clear"></div>
        <div id="footer">
            <div id="copy">
                Developed by Yoshi &copy vAn
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