For all users, regardless of your choosen Internet browser: Click each photo to enlarge.
Internet Explorer
To close the large photo: click anywhere outside of it. You can then choose another to view.
FireFox
To close the large photo: click anywhere on the page. You can then choose another to view.
Opera
After clicking the small photo, inorder to keep the enlarged version open, you need to keep your finger pressed down on the mouse button. Releasing the mouse button will close the image and enable you to view another.