the gimp: animating a gif with a continuous background layer

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http://ubuntuforums.org – Hi I have an animation I'm trying to make use the gimp, to be saved as a gif. So I know about appended the time delay to the title of each layer/frame (50ms), and this works, great, except that the first layer/frame is special. It is the background for all the other frames which are mostly transparent. Leaving the time off the frame doesn't seem to work (the backround briefly flashes then disappears each time the animation cycles). I know I've done this before but just can't recall how it's done. Would someone remind me please? Thanks in advance Regards, Thorsen (Hardware)