You can create a rectangular, circular, or polygonal area.
1. Click the [Polygon], [Circle], or [Rectangle] button of the "Image Map Editor".
2. Drag diagonally to include the desired area of the image.
=> When you release the mouse button, the area is set and the dialog box to specify link destination appears.
Hint
To create a circular area, click the [Circle] button, and then drag on the screen. To create a polygon area, click the [Polygon] button, and then click as many times as the number of the apexes you want to create (each point that you click will be an apex of the polygon).