More than one FPS in one movie?

Hey, Ive been using the resources here to great effect, but have come up with this question.

Is it possible to have movie clips with differing FPS in one file?

For example, if i wanted to have the general pace fairly slow, but also have a movie clip to rapidly cycle something (more times per second than the movie it is set in)

Or is the only way to do this by using a high FPS setting all round and just using more frames for the slow things, or by actionscript somehow?

Cheers guys