Clickable images used for site navigation on Web pages require image mapping HTML code. Within that tag, the code also calls for a named map. An additional section of HTML code is added to specify the coordinates of the mapped areas and the links for each hot spot.
Mapped areas use shapes and coordinates.
The coordinates are expressed in numbers identifying the pixel coordinates of each point. Start at any one coordinate and work your way around the perimeter of the area to be mapped. Any area that is not a part of a hot spot is not a clickable area. Image maps require a great deal of time and must be mapped out by the pixel. There are shareware programs available to map graphics and photos.