1. Complete the comments for all functions.
2. Renamed the "wrapped" or "wrappedElement" to "wrappee" which is
opposite to "wrapper" and self-explanatory grammatically.
3. The original styles including the sizes of the wrappee are remembered
and applied to the wrapper at a later time.
4. Corrected the hiding of the scroll bars on "mouseup" outside of the
wrapper after dragging one of the bars.
5. Corrected an error when getting the quantity of the movement of the
mouse wheel in Firefox.