Click thumbnails to view larger photos. This is not perfect, because when we move an element in the DOM, we really move it -- it no longer exists in the place where it is in the HTML file. In other words, once you have clicked a thumbnail image one time, the big photo is moved to a new location. When you click another thumbnail image, that big photo is removed from the DOM. Study the JavaScript until this is clear to you. Then view version 1, which fixes the problem.