Here is are some examples of clickable image maps.

1. Displays the clickable image inline.
2. Includes a reference to the corresponding image map configuation file. To create an imagemap configuration file use software tools or manually determine the xy coordinates following the format shown below. The map file must end with suffix ".map". When using imagemap software select the NCSA for your imagemap coordinate file format.
3. Uses the ISMAP command within the inline image HTML tag. Example:

   <A HREF="filename.map">
   

   <IMG ALT="" SRC="filename.gif" ISMAP>
   

   </A>

4. Provides alternate text based links for non-graphical browsers.

The format of a imagemap file is fairly straightforward. The first line of the file specifies the default response, or the URL that corresponds to a click outside any defined regions. It syntax is:

default URL

Subsequent lines specify the regions in the image that correspond to URLs.

circle URL x_center,y_center x_edgepoint,y_edgepoint

This keyword defines a circle region with center point x,y and edgepoint x,y.

rectangle URL x1,y1 x2,y2

This keyword defines a rectangle region with any two opposite corners having coordinates x1,y1 and x2,y2.

polygon URL x1,y1 x2,y2 ... xn,yn

This keyword defines a polygon region having adjacent vertices xi,yi. If the path given in not closed the first and last coordinate pairs will be connected.

point URL x,y

This keyword defines a "closest to the a point" region, where the point's coordinates are x,y.

These above keywords can be abbreviated as def, circ, rect, and poly.

Lines beginning with the pound symbol are comments.