I believe you are referring to these:
Undefined
Leave
Restore Background
Restore Previous
• Undefined Directs the browser to do nothing to the background before displaying the next image.
• Leave Directs the browser to leave the previous graphic image as the next is drawn. This choice can create a shadowing effect.
• Restore Background Directs the browser to redraw the original background as the current image is drawn.
• Restore Previous Directs the browser to redraw the previous image as the current image is drawn.
I do not know how to find these settings per frame in a gif image. You might be interested in reading about the format of an animated gif here:
http://en.wikipedia.org/wiki/Graphic...rchange_Format
I looked at it and found some interesting info but wasn't able to find what the method type is for the frame.




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