I use the free animated .gif assembler unFREEz:
http://www.whitsoftdev.com/unfreez/
I also used GIMP (another free program, it's an image editor) to work the transparency of the top layer correctly, and to match the scale and location of the two images correctly.
http://www.whitsoftdev.com/unfreez/
I also used GIMP (another free program, it's an image editor) to work the transparency of the top layer correctly, and to match the scale and location of the two images correctly.





















