Moving to Next Page

Sorry if this seems to be an easy question but I am a trifle stumped re: Coursebuilder.

If you have a multipage page e-learning presentation and several of the pages have quiz interactions, how can you ensure that the user cannot move to the next page until the quiz on the particular page is completed and correct?

I am not using frames but seperate html pages.

Thanks if anyone can point me in the right direction.



John