BoxOpen()

         Opens a light focus window

    Syntax:

         BoxOpen ( nTop, nLeft, nBottom, nRight, cColor, nFast ) -> aBox

         nTop    : Initial Y of the window.
         nLeft   : Initial X.
         nBottom : Final Y.
         nRight  : Final X
         cColor  : Background colour of the window
         nFast   : Pushing speed of the window

    Description:

         Opens a window at the specified position with colour cColor.
         The used colour is for background and its value must not excede 7
         ( it can not include character "+" )

    Return:

         An array with parameter for BoxPush and BoxClose.

    Example:

         BoxOpen ( 12, 10, 14, 40, "B", 0.2 )