I would like to implement the following design.

20 iterations of the following:
--subject watches a video
--if subject taps space bar before video concludes, subject is skipped directly to next video
--if subject watches video to completion, subject is automatically directed to a questionnaire page (or the 'continue' button could appear which would take them to the questionnaire)
--on completion of questionnaire, subject begins viewing next video.

How can I do this in MediaLab?