New answers tagged gif
It's been quite a while since I've launched Imageready and no longer have it available to test. By "slide" I assume you mean animation frame. In the animation panel There may be an option to save frames. If not, there is an option to flatten frames to layers. This would create a new layer for each frame of the animation. You could then simply export or ...
There is no tool in Photoshop that will let you erase different layers at once. What you can do instead is grouping all your layers and applying a mask to the group. I would actually recommend that whenever it's possible (and by that I mean almost always!), you use masks instead of the eraser. It works with animated gifs too:
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