photo viewing controls

• Right arrow or 'n' key: move to next photo
• Left arrow or 'p' key: move to previous photo
• Escape or 'x' key: return to thumbnails
• If you prefer using a mouse, you may click in the left or right half of each picture to move back/forward, and click outside the picture to return to the thumbnails.
• Clicking a thumbnail will jump directly to (the large version of) that picture