Below is a brief description of the syntax. The first word on each line describes the type of shape that the hot spot has. This word must be either default, circle, poly, point, or rect . After the URL you put coordinates which define the area. You don't use any coordinates on this line.
Circle is used to define a circular area.
12,15 Poly is used to define a polygon. You use as many coordinates as you need. Rect is used to define a rectangle. After the URL, specify two corners of the rectangle - the upper left and the lower right. 45,60 Point takes one pair of coordinates.