wycentrowanie w pionie i poziomie

Kod PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-2" />
        <style type="text/css">
body {
    background:#000000;
    margin:0; 
    text-align:center; }

div#content { 
    text-align:left; 
    margin:0 auto; }

div#myAlternativeContent {
    margin:0; text-align:center; 
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 10px;
    color: #CCCCCC;
}
        </style>
        <div id="content">
        <script type="text/javascript" src="swfobject.js"></script>
        <script type="text/javascript">
            var flashvars = {};
            var params = {};
            params.menu = "false";
            params.quality = "high";
            params.scale = "noscale";
            params.wmode = "window";
            params.bgcolor = "#000000";
            params.allowfullscreen = "true";
            var attributes = {};
            attributes.align = "middle";
            swfobject.embedSWF("index.swf", "myAlternativeContent", "980", "600", "9.0.0", false, flashvars, params, attributes);
        </script>

        </div>
</head>
    <body>
        <div id="myAlternativeContent">
            <a href="http://www.adobe.com/go/getflashplayer">
                <img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" />
            </a>
        </div>
    </body>

</html>