NAME: GetImage

     USE: Procedure that saves a specified bit image into a buffer.  The
          rectangular coordinates are given to GetImage and then
          saved in a buffer.  The buffer is an untyped value of at least
          equal to 4 plus the amount of area defined by the region.  The
          ImageSize function can be used to determine the size requirements
          of the buffer.

     DEPENDENCY:  Must first be in graphics mode.  The unit Graph
                  must also be placed in the uses section.

     SYNTAX: GetImage(X1, Y1, X2, Y2 : Word;Var BitMapBuffer);