Path-Based Animation

creates an animation by displaying the movement of an animated object onto a fixed background in a particular sequence or path. The shape of the animated object remains the same.

You-Tube - http://www.youtube.com/watch?v=HOMFMQCiTLo
FlashPerfection - http://www.flashperfection.com/tutorials/Create-A-Path-Based-Animation-Using-Adobe-Flash-CS3-51241.html