When the user clicks on the image the location clicked is sent to the server designated by the link. If you click outside of those regions, you get the default URL for the map, which in this case is Rensselaer's WWW server. The image map identifies regions of the image which serve as hypertext links. When any of the regions are clicked, the link is followed, using the URL indicated in the map file. The first line in the configuration file specifies the default link to be followed when a user clicks on a region that doesn't correspond to one of the other regions you specify.
Subsequent lines specify regions in the image that correspond to arbitrary links.
Here is the image map configuration file for the example image map shown above. Image Map Configuration File Suppose you have a map of a floor plan of an office building in a GIF file, called floorplan.gif . Each room contains a link to the occupant's home page. When a map location is clicked, the room occupant's home page is brought up. Here is how to create a clickable image map for the floor plan.