Auto detecting projector resolution?

my wife teaches college and uses an overhead projector often. i'm trying to get her to use her macbook and keynote so she can use the remote (she takes her macbook to school anyway), but whenever she plugs it in, the projector shows the wrong resolution on the screen (it's 4:3, by the way). and the resolution on her macbook is out of whack, too, when it's plugged in (desktop is way too big for the screen, meaning you can't access a bunch of stuff on the top - including display preferences.)
my question is: can it be set so all you have to do is plug in the projector to the macbook and both display the proper resolution?
bonus question: can it be set so the macbook has the proper resolution when you unplug it from the external projector - i've had her call me several times to rectify this over the phone.
thanks!

BSteely wrote:
OK, well without further information, I will take a swag at this. I am guessing the projector is really old and may only support a max resolution of 640 x 480, or possibly 800 x 600. In mirror mode, that means that both screens, e.g. the MacBook's and the projector's, must run at the same highest common resolution. But running the MacBook at 640 x 480, you are right, a bunch of important stuff may not fit on the screen. So that is my guess why she can't "simply plug it in and have it work."
She might be better off running non-mirror mode and just using the projector as extended working space. Then she will have to drag the window containing the information she wants her audience to see onto the other (projector's) display area. That's all I can think to do.
i appreciate the input - especially without a lot of information. i may try the mirror mode.

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