Image quality

I have a logo on the top left corner of a flash movie, this logo doesn’t move at all. However, other part of the movie (which are layered ontop of this base layer) have motion tweens.

The quality of the .jpg logo is poor for this .swf even when exported with the quality set too 100%.

Any Ideas, is there anything in particular you have to do to maintain .jpg quality when tweening other objects?