Как выровнять sfw по центру? Вот так не получается

Код:
<HTML>
<HEAD>
<meta http-equiv=Content-Type content="text/html; charset=">
<TITLE></TITLE>
</HEAD>
<BODY bgcolor="#0000FF">
<!--div style="width:900px;"-->
<div style="margin-left:-50%;background-color:#ff0000;">
<div style="padding-left:50%;background-color:#00ff00;">
<OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" WIDTH="528" HEIGHT="400" id="clip3" ALIGN="">
<PARAM style="wmode=:transparent" NAME=movie VALUE="clip3.swf"> <PARAM NAME=quality VALUE=high> <PARAM NAME=bgcolor VALUE=#FFFFFF>
<EMBED style="wmode=:transparent" src="clip3.swf" quality=high bgcolor=#6699FF WIDTH="528" HEIGHT="400" NAME="Untitled-1" ALIGN="" TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer"></EMBED>
</OBJECT>
</div>
</div>
<!--/div-->
</BODY>
</HTML>