I\'m trying to find a way to use the original Apple system buttons and icons in a web site. Is there a way to get these original graphics in png format?
There are no
The icons are scatter throughout the system applications they are a part of. There is no central location they can be harvested from. Some of the icon apps might be useful for harvesting them once you find them.
If your interested in UI elements, the Interface Builder bundles have most of them inside.
I know that Graffeltopia has numerous Omnigraffel stencils with Mac system graphics in them.
I think copyright wise, your okay as long as (1) you put a notice that that Apple has the copyright on the images and (2) you don't create the impression you are in anyway Apple Computer and (3) you don't use them to create close simulations of the Apple user interface in any medium.
Otherwise, it follows under fair use. For example, if your doing and article on the Apple UI you can definitely use the graphics in examples.