Saving a gif file on a mac?

[eriekittym]

Iam just learning how to make a gif file using adobe photoshop CS3. But whene I save as a gif file. It does not anaimate or move like it should. I have heard that a program called adobe fore works would help but I have never used it before. Can anybody tell me how to save the gif file so it well be a moving pic? Anyhelp would be much appcaited. Thanks in advance.

eriekittym