I don't know if this will help at all [I rarely post because I always think that my suggestion is silly] but, depending on your audience, you could pop the browser so that the navigation buttons are not present and force all navigation through ajax or built in links. That way the user can't use them and [a] break something by clicking "back" or [b] get scared by any of those daunting POST warning messages.
I would recommend against that. That would be bad for usability. There are standards for a reason. Many people don't even use those buttons. I, for example, have all bars except the address bar turned off in my browsers and navigate (back and forward) entirely with the keyboard.
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