Does anybody have any experience with Ulead Gif Animator? If so can you tell me how you can make the background of an animated gif tranparant with it?

I don't know Ulead, but most probably you'll have to give the back 1 colour and set that colour to be transparent.

The process DutchKid described is correct and that setting should be easy enough to find.

Depending upon the other colors in the animation, the backgrounds most commonly used for transparencies are 255-0-255 (fuchsia) and 0-255-0 (bright green.

Best,

~SC