ecco qui...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>test</title>
<script language="JavaScript">
<!--
self.moveTo(0,0);
self.resizeTo(screen.width, screen.availHeight);
//-->
</script>
<style type="text/css">
<!--
body, html {
background-color:#000000;
height:100%;
}
div.centrato {
display: block;
width: 750px;
height: 550px;

position: absolute;
top: 50%;
left: 50%;

margin: -275px 0 0 -375px;
}
-->
</style>
</head>
<body>
<div class="centrato">
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="750" height="550">
<param name="movie" value="pippo.swf" />
<param name="quality" value="high" />
<embed src="pippo.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="750" height="550"></embed>
</object>
</div>
</body>
</html>

grazie mille!