To manually navigate (pause, skip, go back) move your cursor onto the slideshow picture and a "control bar" will appear on the bottom.  Click on either of the arrows or the pause button between them to control the slideshow yourself.

To search through individual photos, click the icon on the left of the "control bar" then select "Christmas 2011".  Clicking on a thumbnail of a photo will show a larger version.  You can also order prints by selecting the "Print" option which can be found above the photo(s).