heres a begginer guide in GIF's it espleains every thing you need to know about Gifs and making them
your welcome
http://forum.toribash.com/showthread.php?t=189894

Erm, i am not asking how to make a GIF, so please read the post before posting useless links :/

Ehem, it needs to be less than 100x450 px

Maybe that's your problem.

Because. If a signature is bigger than 100x450 px it gets resized, if it's a gif. it looses all frames so it looks plain.

Ohey Alejandro, Its solved my problem