Have you tried reassigning the buttons?
I don't have a Zire 71, but on my TT I reassigned the buttons.
Open a document.
Tap the Menu icon.
Select Options / Button
I assigned Button "Left" to the function "back", and button "Right" to the function "forward". I also assigned button "Jog/Nav Push" to the function "hyperlink" so that I can navigate links.
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