Set External Display as Default?

I have a 15" Powerbook with OS X 10.4 installed. I have hooked up an external monitor to the Powerbook's external DVI output.
Is there any way I can set the external monitor to be the default (ie primary) one? I'd like to have the main menu bar, the dock, and all the desktop icons display on it, and have new applications open on that display.
Thanks,
Doug.

In the "Arrangements" pane of "Displays" System Preferences, drag the menu bar from the picture of the laptop display to the picture of the external display.

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