I had the same issue. Here's what I did:
My code is:
This assumes you've put a wrapper around the whole of the prev/next button output with the ID of "prevnext".
Hmm... you can add something like that to the At end of the HEAD section at Look and Feel > Custom HTML in the Admin panel.
But you can only add (X)HTML like that. If you want to add a macro to the body, place it to the header section, like Bob mentioned, and than cut and paste it with JQuery to where you want it to live after the page has rendered.
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