RestScr()

         Restores a saved screen region

    Syntax:

         RestScr( nY1, nX1, nY2, nX2, aScr [, nDelay] ) -> Nil

         nY1    : Upper left Y coordinate
         nX1    : Upper left X coordinate
         nY2    : Lower right Y coordinate
         nX2    : Lower right X coordinate
         aScr   : The screen saved with SaveScr()
         nDelay : Delay time. By default 10.

    Description:

         Restores a screen saved with SaveScr() wiht a spectacular effect.

    Return:

         Nothing.

    Example:

         nMode := 2
         aScr  := SaveScr ( 10, 10, 20, 70, nMode )
         DispBox ( 10, 10, 20, 70, "+-+|+-+| ", "W/B"  )
         Inkey(1)
         RestScr ( 10, 10, 20, 70, aScr )