Since there is no way that you can make the flash object transparent, there needs to be some other means by which you can match the background. I thought of maybe creating a ActionScript/Javascript bridge, but I wonder if this is the route to take.
Do I have a better option?
Wouldn’t wmode=transparent or wmode=opaque fix that ..
http://kb2.adobe.com/cps/142/tn_14201.html