HTML5 and Slide Functionality

Hi,

I'm building a course that has enter and exit animations on each slide. The timelines are set to pause halfway through and continue when the user clicks the Next button. When the slide reaches the end of the timeline the course then moves to the next slide.

This all works when the course runs in Flash; however, when I launch in HTML5, the timeline will advance when the user clicks any item on the slide (not just the Next button). For example, I have a slide with 4 tabs, and after the user clicks each, a video plays on a lightbox slide. When I launch in HTML5 and play the first video the slide progresses after I close the lightbox. Any ideas why this is happening?