[G]o to System Preferences>Mouse and activate the secondary mouse button, then go to System Preferences>Exposé & Spaces and in the middle portion of the screen you can choose to set your secondary mouse button to open exposeI don't know if this will work the same way in 10.4; I do have an old PowerBook that's still running that version of the OS but I don't have an external mouse to test it with, unfortunately.
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Otherwise, have you checked for drivers for whatever mouse you have installed? You may need the mouse's specific driver programs instead of Apple's default stuff to map buttons.
posted by brainmouse at 1:19 PM on August 18, 2012