How to create animated GIFs using Photoshop

1) Create a document with each frame of the animation on a different layer.
2) Select the layers to be used in the animation from the layers palette
3) From the top menu select: Window > Animation
4) Click on the flyout menu in the upper right hand corner of the animation palette and select “Convert to Frame Animation” (if not possible, you already are in frame animation view so no action is required)
5) Click the flyout menu on the animation palette and choose “Make frames from layers”
6) Under each frame is an arrow head pointing downward. Click on the arrow head to display timing menu and select the display time for each frame.
7) File > Save for Web and Devices (.gif under this option)

That's it!