sinceramente 2 <object> annidati non li ho mai visti...

comunque, per chiarire cosa aggiungere e dove
codice:
<script type="text/javascript">
AC_FL_RunContent( 'codebase','http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#
version=9,0,28,0','width','750','height','160','src','header flash','quality','high','pluginspage','http://www.adobe.com/shockwave/download/
download.cgi?P1_Prod_Version=ShockwaveFlash','movie','header flash','wmode','transparent'); //end AC code
</script><noscript>
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#
version=9,0,28,0" width="750" height="160">
<param name="movie" value="header flash.swf" >
<param name="quality" value="high" >
<param name="wmode" value="transparent" />
</object>
</noscript>
ciao