You need to show us YOUR code, so that we can help you smooth out any wrinkles.
The easiest way would be to have the buttons in a link that show the action, e.g.
<a href="?action=prev"><button>Previous</button></a>
There are many other ways to do this. You will need some sort of storage for keeping track of the current question - either use sessions or cookies. I would recommend session as it tends to be a lot easier.
diafol
Rhod Gilbert Fan (ardav)
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