With a server-side image map, a file on the host server contains the coordinates for the image map, and a server script processes requests.
To create an accessible server-side image map, you either provide a list of alternative text links on the same page as the image map, or a hyperlink to another Web page that contains equivalent text links.
A server-side image map uses the ISMAP code and are currently not accessible to anyone using non-graphical browsers or browsers with images turned off.