Have you tried using
http://code.google.com/p/swfobject/[
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Here is the doc on flash params
http://kb2.adobe.com/cps/127/tn_12701.html[
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vmode could be the solution to your problem you can set it to one of the following:
window: movie plays in its own rectangular window on a web page.
opaque: the movie hides everything on the page behind it.
transparent: the background of the HTML page shows through all transparent portions of the movie. This option can slow animation performance.
Setting vmode to transparent is the computationally most expensive option ..., while window (in IE on Windows) usually provides the best performance
Also remember that setting quality to best provides the best display quality, but does not consider playback speed. All output is anti-aliased and all bitmaps are smoothed
Regards
Espen Harlinn