How to Make Animated GIF from Layer Comps?

Have CS3 on XP.

I have 15 Layer Comps created the way I like them...How do I make an Animated Gif or animated PNG from the Layer Comps?

Id Like Each Layer of the animation to be one of the Layer Comps... so it shows the progression of the frames built from 1st to last.

Thanks

Suzzie

I'm not sure off hand since I rarely ever have used layer comps, but I believe you need to flatten them before being able to use them in an animation...

Mylenium