You can view your photos in a slideshow by album or by selecting all of your photos. From the Home screen, tap Apps > Gallery .
Tap the album with the photos you want to view, then tap the Menu key > Slideshow > verify the slideshow settings > Start.
Tap the Menu key > View all files > Menu key > Slideshow > verify the slideshow settings > Start.
Tap the Back key to stop playing the slideshow.