Self contained movie

ok - I know this should be easy, but I am missing something on the mechanics.

I want to make a movie that plays when rolled over. Its important that it is a movie, not a button, so I have full control over start and stop.

I can easily make a movie that plays when activated by another object, but I want it to be self contained in a single object.:azn:

myMovieClip.onRollOver = function() {;