Click on the image next to the gallery name.  That will open the gallery and you can then see full size images by clicking on the thumbnails.  A few of the galleries have a "slide show" feature.  I'm not certain what the cause but I've discovered that if you use the 56k option to view (even if you are on a high speed connection) the music will usually start sooner.  I was unable to control the speed at which the slide show progresses so if you want to take a closer look at the images I'd recommend not using the slide show.