This is not possible in PDF, as far as I know.
Can't be done unless you want to get into a very complicated one page document with show hide buttons. Even then, I'm not sure how well it would work.
I see you asked this question in 2013, did you solve it?
Do you know if things have changed since and it can be done now.
I really need to have my buttons as the only navigation.
Absolutely nothing has changed in the way PDF works in 2016.