Strict navigation

Is it possible to make the navigation in the Menu tab Strict, temporarily? Let's say I have a radio button question page. If the user does not answer the question at all, I want him to remain on that page. I can always show a layer, saying please make your choice, if the user tries to click the NEXT button but for this particular page I don\t want him to be able to navigate away from the page at all until he has made his radio button choice, even if he tries to use the Menu.

Is it doable?

br

gustaf

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