I dont know much about how the flash object works , but I am embedding a video in Dreamweaver ,and there is a white background on the background.
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="360" height="240" id="FLVPlayer">
<param name="movie" value="FLVPlayer_Progressive.swf" />
<param name="quality" value="high" />
<param name="wmode" value="opaque" />
<param name="scale" value="noscale" />
<param name="salign" value="lt" />
Set the
wmodeproperty totransparent.However, be sure to test it. From Adobe Support: