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 growbox()           Draw a zooming box
------------------------------------------------------------------------------
 Declaration
   screen.hdr

 Syntax
   proc growbox extern
   param value uint uTop, ;
         value uint uLeft, ;
         value uint uBottom, ;
         value uint uRight

 Arguments
   iTop is the top row of the box.

   iLeft is the leftmost column of the box.

   iBottom is the bottom row of the box.

   iRight is the rightmost column of the box.

 Return
   None.

 Description
   This procedure draws a "zooming" box on the screen with the final
   coordinates specified using the BOX_DOUBLE semi-graphic characters.
   Because this routine internally uses loops to create the necessary
   delays, the zoom speed depends on the speed of the computer system. Use
   zoombox() if you want a zoom effect which is almost independent from the
   CPU speed.

 Example
   #define EXAMPLE_SCREEN
   #include example.hdr

   proc Test_growbox
   growbox( 10, 20, 20, 60 )
   endproc

   proc main
   Test_growbox()
   endproc