I want to switch between mirroring and separate displays for presentations

I am trying to switch between mirroring my screen for a presentation and then using seperate displays. Is there a way to create a shortcut in the menu bar?

Well, that's the way to create a shortcut in the menu bar in Mountain Lion. It's supposed to show up any time you have the external display connected (or when an eligible Apple TV is on the same network).
Are you running Mountain Lion (OS X 10.8.x)? Your profile doesn't say. I don't recall whether it worked on Lion.

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