May have aready finished this, but another option might be to use something like camstudio, demostudio,wink or camstasia. I would say whatever 2d edit sw you like...since carrara isn't good for that.Altho I find tif better to work with than jpeg. Depends on filesize issues tho.Fireworks for example will pull a series of tifs in automatically as an animation, but don't remember flash doing this.

No need to think outside the box....
    Just make it invisible.