Actually mscallisto, whether it be the fencepost or the gatepost, 'between' is still correct.
Regardless of the number, when you're dealing with distinct items, (me, you, and the ...post -- all distinct items), 'between' may be used. Contrast that with another common phrase in the same genre (although no longer politically correct), 'among us girls'. Among is proper here because 'us girls' is not distinct.
Good Luck
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