In the sample image map, the dark shaded regions are links to other files on the server. Image map files have the .map file extension. The light shaded regions of the sample image map were not mapped-out. The blue area is called the default region. You can assign a URL to this region if you wish.
Clickable images work with graphical Web browsers only.
When you include an image map in a Web document, be sure to include a text-based method for users to access your information. Select an appropriate image. Determine where to locate the clickable areas. Creating a map file with A description of the coordinates of each hyperlink area Specification for the URL for each area Reference the image and map file in an HTML document. Test each area of the clickable image.