TIPS for Gallery
You can: 
 - Use your scroll button to zoom in or zoom out of the main photo panel window.  (click photo panel first)
 - You can also "right click mouse button"  and click on "full screen" mode.  Same process to exit full screen mode.
 - You can click on any photo to make it larger.
 - Other cool features include, hold mouse button down on any photo and move the mouse  
    left or right the whole photo panel will move.  You can also just watch a slide show.