Swfobject center in the browser

Can someone help me to center in the browser my swf, i´m using swfobject.

<script type="text/javascript" src="swfobject.js"></script> 
<div id="flashcontent" align="center">If you see this, you need flash player 8!</div> 
<script type="text/javascript"> 
   var so = new SWFObject("index_final.swf", "mymovie", "770", "480", "8", "##f0e8d1"); 
   so.addParam("scale", "noscale"); 

I tested in firefox and in Safari and my swf align´s in the top center, if someone could help thank´s in advanced :slight_smile: