Sad to say, but I've tried various methods and none of them have worked.
I suppose Graal doesn't support Flash transparency.
I tried these and it didn't work:
PHP Code:
useownprofile = true;
profile.opaque = false;
profile.fillcolor = {0, 0, 0, 0};
profile.transparency = 0;
setFlashVariable("bgcolor", "#000000");
setFlashVariable("wmode", "transparent");
setBackgroundAlpha(0);