Expanding on that response...IM can be used to generate the images for a page like that, and in fact is used by many image indexing programs for that purpose.
You will either need to use one of these programs, or roll your own.
Basically IM provides the tools for generating such indexes, and while montage can generate a simple HTML page (See HTML Thumbnail Image Maps), it is more of an example than image indexing method. However I do use it to generate, IM Examples, Photo Store Index. But that is not what you are requesting.
One such tool that may do this is... WebMagick
Otherwise you will need to search around.