This should explain
1. Ok i chose these two layers[Keep them same size][all sizes are allowed]
2. Now as i said open up Animation like so:
This bar will emerge:
Click this button to duplicate:
this is what u will get:
Make top layer invisible by clicking off the eye.Ur duplicated image will change:
Now set Time delay.Once thats done click 'Play button' in Animation bar to check if its rotating fine.Save as .GIF via SAVE FOR WEB option in FILE[untick interlaced if its ticked]
This is what i got with 1 sec delay:
P.S. if u set time delay to 0 sec it will refresh with the webpage[i.e. it will show Gerrard and if u refresh the page,u get Boyd in my case]
Always save as .GIF as it will not animate otherwise.Also the save should come via SAVE FOR WEB