Please search the forum there are several threads about lightbox and other box derivates. Also it is quite the same as decribed on the lightbox site itsefl.
You know the header each html file has, don't you? If not you probably really should learn some html basics first.
To answer the other question: The header of the file you want to use the lightbox on. If you want the lightbox if you click on a thumbnail that would be album.php. Please read the theming tutorial to get familiar with the structure of Zenphoto themes.
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To answer the other question: The header of the file you want to use the lightbox on. If you want the lightbox if you click on a thumbnail that would be album.php. Please read the theming tutorial to get familiar with the structure of Zenphoto themes.