How to style a scroller using Javascript

I have a site where on the sidebar I have some videos with a scrollbar (http://mibsoftw开发者_JAVA百科are.us/clients/raveis), I need to figure out how style this scrollbar so it can be a different color, etc. What is best way to do this? Any help would be greatly appreciated.

the scroller is inside a div

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Take a look at jScrollPane to style scrollbars in cross-browser fashion.
See the basic demo here