server-side interaction
Even without sophisticated WebGIS technology, it is possible to interact with maps on the Web.
In this example, an HTML image map and PHP is used to highlight that part of the UK on which the user clicks with the mouse pointer.
This interactive map is taken from: Waterstone's Online
This example shows how to successfully implement overlapping hotspots, circumventing the exclusiveness. The hotspot of the capital London has been cut out of the hotspot of East England.