Io ho usato questo codice e funziona, in Joomla 1.0:

<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="450" height="60">
<param name="movie" value="http://www.misoito.it/images/banners/filmato.swf" />
<param name="quality" value="high" />
<param name="menu" value="false" />
<param name="wmode" value="" />
<embed src="images/banners/filmato.swf" wmode="" quality="high" menu="false" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="450" height="60"></embed>
</object>