To zoom-in, choose this icon, and click on any part of the Mars map. Each zoom-in click on the map magnifies the view about 2 times. The blue-tinted stripes on the map are footprints of images.
To select images, choose this icon, and click on an image footprint. If one or more images cover the point you clicked, you'll see a thumbnail of the image below the map and its reference number in the Image List at left. Click either a thumbnail or the reference number, and a window will pop open giving image details.
Click on this help button to open a simple guide that explains how to use the web map more fully.