Auto Gallery Pro currently supports different animation options. One of the option is Random. The other options are
If you select Random option then images of your Gallery will have one of the above animations applied to them. For example if you have 7 images in a Gallery and you have selected Random animation option then each image will have different animation.
Your first image will have Top , Second will have bottom and so on. The animations will repeat in this order if images are more than 7.
The animation option is not applicable if images are viewed in Light box.