How do I center my Flash movie in the web browser?

How do I modify the .html file that Flash produces (when publishing) so that my flash movie is always centered? Now it is always Justify Left.

Here is the .html text:

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=“http://www.w3.org/1999/xhtml” xml:lang=“en” lang=“en”>
<head>
<meta http-equiv=“refresh” content=“3;url=demo2_alternate.html” />
<title>demo2</title>
</head>
<body>
<object classid=“clsid:d27cdb6e-ae6d-11cf-96b8-444553540000” codebase=“http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,0,0” width=“80” height=“80”>
<param name=“movie” value=“flash_detection.swf?flashContentURL=demo2_content.html&altContentURL=demo2_alternate.html&contentVersion=7&contentMajorRevision=0&contentMinorRevision=0&allowFlashAutoInstall=false” />
<param name=“quality” value=“low” />
<embed src=“flash_detection.swf?flashContentURL=demo2_content.html&altContentURL=demo2_alternate.html&contentVersion=7&contentMajorRevision=0&contentMinorRevision=0&allowFlashAutoInstall=false” quality=“low” pluginspage=“http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash” type=“application/x-shockwave-flash” width=“80” height=“80” />
</object>
</body>
</html>