trata con esto (de esta forma nunca me ha fallado):
Código:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000"codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="610" height="301">
<param name="movie" value="index.swf?carpeta=prueba" />
<param name="quality" value="high" />
<param name="wmode" value="opaque" />
<embed src="index.swf?carpeta=prueba" quality="high" WMODE="opaque" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="610" height="301"></embed>
</object>
</body>
</html>