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  MSCLEARPRS()                                                Mouse Function
 Purpose..: Wait for the release of a mouse button
-------------------------------------------------------------------------------
 Syntax...: MsClearPrs( <nButton> ) --> NIL

 Arguments: <nButton> = the mouse button to check. Valid button numbers
                        are defined in FW_MAIN.CH as follows:

              Mouse Button Translate Directives as found in FW_MAIN.CH
              --------------------------------------------------------
              Value  FW_MAIN.CH   Button(s) pressed
              --------------------------------------------------------
              0      MB_NONE      none
              1      MB_LEFT      left
              2      MB_RIGHT     right
              3      MB_LT_RT     middle
              4      MB_MIDDLE    left and right
              5      MB_LT_MD     left and middle
              6      MB_MD_RT     middle and right
              7      MB_ALL       all buttons pressed
              --------------------------------------------------------

 Returns..: NIL

 Source...: FW_MAIN.CH
-------------------------------------------------------------------------------
 Example..: . The example waits for the mouse button to be released
              only if it has been pressed.

            if ( MsIsPress( MB_LEFT ) )
               MsClearPrs( MB_LEFT )
            endif