Useless properties removed. Object scrSt created to handle wheel and keydown events. Function setWheelEvent() removed. The property pScroll (parentScroll) added to let to scroll the parent handyBox when the child's scrollbar has reached the limit. The property sHide (scrollHide) added to let to hide scrollbars when handyBox is not being scrolled currently. The problem of appending elements with overflow:scroll/auto into handyBox fixed.
Useless properties removed. Object scrSt created to handle wheel and keydown events. Function setWheelEvent() removed. The property pScroll (parentScroll) added to let to scroll the parent handyBox when the child's scrollbar has reached the limit. The property sHide (scrollHide) added to let to hide scrollbars when handyBox is not being scrolled currently. The problem of appending elements with overflow:scroll/auto into handyBox fixed.

devrafalko/handyScroller