OSX-Style Scrollbars With jQuery – LionBars
LionBars is a jQuery plugin for creating OSX-style, custom scrollbars for any web page.
The scrollbars created looks the same in all browsers under each OS and they don't hurt the usability by not shrinking the content or with the auto-hide option.
It has support for endless scrolling (check related WRD tutorial) and can fire functions when the scrollbar reaches to the end.
Compatibility: All Major Browsers (IE support starts with IE8+)