Sounds like the bleed through is due to image transparency. Try saving your GIF without transparency and then preview in browsers.
Hi and thanks for the speedy reply . I actually want a transparent gif at
the end , sorry , should have mentioned that. I can draw a series of
transparent layers and that works ok , the problem comes when I import a
gif or movie drawn using Pencil . It may be connected with the way it
creates both Frames and Layers in the Layers palette , I'm not sure. As I
say , it looks fine playing it in CS5 , and one time I managed to correct
it but have no idea how I did it , and have not been able to repeat that.
Problem solved , there were both layers and frames in the layers palette , same number of each when I loaded a gif from another source , or due to my following some option I thought I should do , like Flatten Frames into Layers. When I deleted all the Layers in the Layer Palette and just left the Frames there , it works fine. I think there are other problems with importing gifs from other apps though , , maybe I'd be better off just working from scratch in Photoshop.
Thanks to Nancy O for responding