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  Name:     m_maxcol() - set max/min columns that mouse can access
  Usage:    m_maxcol(<mincol>,<maxcol>)
  Params:   integer <mincol> - minimum column mouse can access
            integer <maxcol> - maximum column mouse can access
  Returns:  nothing

 ---------------------------------- Example ---------------------------------

                 box(10,10,20,50)
                 m_maxcol(10,50)
                 m_maxrow(10,20)

            * this keeps the mouse cursor in the box @ 10,10,20,50