Loop two independant HTML5 presentations

I need to be able to loop through two distinct presentations without any user interaction (kiosk). So presentation A plays... Then presenation B plays... And repeat. Two different groups create the content so they have to be in separate presentations. I see two ways of accomplishing this but need to know how the player java script works.

1) Change the iframe source when the first presentation completes - For this two work I need to know if the player sends an event when it reaches the end

2) Change the iframe source based on a fixed time - For this to work I need to know if the total run time of the presentation is embedded in the HTML or Javascript or can be calculated so I can retrieve it and plug it into my page.

If there is another way that I am overlooking please let me know.

thanks!

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