I can establish a hyperlink from the magazine in the photo to Wired magazine's Web server. Where virtual equivalents don't exist, I can create them. The second step is to develop an image map file. You will need to create a separate image map file for each clickable image map on your Web server. Each line in an image map file defines a hotspot, by defining an area within the graphic and the corresponding URL to be returned if someone clicks on that area.
Coordinates are x,y pairs counting in pixels from the upper left-hand corner of the image.
The server takes the coordinates from a user's mouse click and steps through the map file to determine if the click is within any hotspots. As soon as the first match is found, the corresponding URL is used to redirect a document to the user's Web browser. There can be only one default per map file. It is normal to mix and match circles, multiple polygons, and assorted rectangles in the same map file. Although you should try to minimize overlapping hotspots in the image map, if there are any, the first match is the one used.