Preloader question

Hi there,

I have an animated preloader that I use to preload my flash movie (works fine). I am also trying to use it within my movie for loading jpeg images.
It works fine for the movie preload (I place an instance of it on the stage).
However, within the movie itself (where I attach the movie using attachMovie) the preloader shows but doesn’t animate.

Is there any reason why this should be happening?

Thanks!