A region may be a rectangle, circle, or polygon. A region's coordinates are specified in pixels. Regions may overlap. If so, the first region specified takes precedence. Permission to store and update files on a server is required.
Modifications require changes to map files on a server.
It is not clear from HTML what processing is being done - maps are on a server. Very server dependent. MouseOver, MouseOut, and client script processing not available. MouseOver does not automatically display URL in status area. The region definitions and associated URLs are stored on the client.