We're integrating postTo functionality into our existing flash app. However, because postTo displays a lightbox-like dialog that uses opacity, the flash content will disappear when using Firefox 2 on Mac.

There's a nice writeup of the issue and a workaround here:
http://jakeo.org/blog/2007/03/16/css-opacity-and-flash-transparency-in-mac-firefox/

The workaround mentioned would have to be implemented by MySpace, and I haven't been able to come up with a fix that we could implement on our app's end. Anyone else have a fix? Would myspace consider changing the way they implement these lightboxes (eg, by using transparent PNGs instead of setting opacity)?