To activate Keyboard Control, click inside the pink frame above.
Hover the mouse cursor over the image to see the caption, if there is one.
N :: Show/hide navigation bar
 
G :: Open/close gallery
Left Arrow :: Previous image
 
Right Arrow :: Next image
Up Arrow :: Skip to next image group
 
Down Arrow :: Skip to previous image group
Space :: Pause/play auto mode
Captions :: Put cursor over image to see them