The best way to do it is to use a web-based presentation player like SlideShare. SlideShare has a nifty integration with Ponga so that you just paste in the link for your presentation on SlideShare and your presentation appears in a selection in Ponga.
Here’s a quick way to give it a try. Copy this link http://www.slideshare.net/jennyrobot/cats-and-theinternet and paste it into a selection in your picture. Have a good time.