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SET_YREV()
   Reverses the Y axis direction.

   Syntax
         nOnOrOff = SET_YREV([nOnOrOff] [,nSide])

   Arguments
         OPTIONAL PARAMETERS
         nOnOrOff    Turns the Y axis reverse on or off.
                     0 - OFF. [Default], 1 - on
         nSide       Left or right Y axis 1-left, 2-right

   Returns
         nOnOrOff    Returns the current reverse status.

   Description
         SET_YREV() reverses the Y axis direction. If set ON, the axis will
         reverse from high on the left to low on the right.