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Using Imagemaps

One other use for images on Web pages that hasn’t been touched on yet is the imagemap. Put simply, an imagemap enables you to define different portions of an image as hyperlinks that point to different URLs. The sections of such an image are often called hot zones, and they’re defined using the imagemap specifications.

You have two different imagemap approaches to consider: client-side and serverside. Server-side imagemaps are the older type. In essence, they rely on the server computer (specifically, a map server) to recognize and deal with the clicks that a user makes. Most graphical Web browsers now support the client-side approach, which simply means that the browser itself can recognize where the user clicks and launches the specified URL. This section focuses on client-side maps because they are the dominant type. Server-side maps are discussed briefly at the end of this chapter.


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