Is it possible to override the context-menu in a browser?

I've been tasked with a requirement to override the browser's right-click functionality and add client specific options to the context menu, as well as the op开发者_如何学编程tions that are already there. Is this possible? If so, what kind of work is involved?

I noticed that on Google Docs, they have replaced the context menu with their own implementation of a context menu with their own options. How much work is involved with implementing something like this?

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You can't "inherit" the browser context menu. The only way is having your own custom menu.

Quick Googling brings up this plugin for example, which looks pretty neat:

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You can also try YUI Menu. In my experience YUI is more browser compatible and extremely well documented. Here's a context menu example