Topic: center image

Can anyone tell me how to center the viewer in an html page, I am using frontpage and here is the code I have so far.

<p>&nbsp;<div id="flashcontent">SimpleViewer requires JavaScript and the Flash Player. <a href="http://www.macromedia.com/go/getflashplayer/">Get Flash.</a></div>
        <script type="text/javascript">        var fo = new SWFObject("viewer.swf", "viewer", "480", "650", "8", "#000000");        fo.write("flashcontent");
                </script>   
</p>


Thanks