I know in CS2 you have to make each cell on a new layer then set what you want on the layer in the animation box for each cell-
So you make a background and your layers, make the background visible or select it, in the animation window it shows as the first cell, then you have to duplicate the cells, select the cell you want, select the layers you want to show, then do that over and over for each one.
Ah, yes. It's actually on a website if you don't mind. [link] Choose Animaki from the list and there you go. I don't know if you wanted to make GIFs from images, but this is handy for pixel animations.