Finding Aqua & Windows interface buttons

[Jack Tsu]

On OS X, the Rev documentation viewer uses the same backward/forward buttons 
found in Safari, Finder, and elsewhere. Where can I find the GIFs (or PNGs, 
or whatever) of buttons like these?

I'd especially like the open, minimize, and close buttons for Aqua (OS X) 
and Windows, as I am making my own titlebar and so I need to incorporate 
them manually.

Thanks very much in advance.

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