Tom-
Ran across this. It works great. You can create a link and when the person clicks on it...the power point presentation opens in full screen automatically and runs and when it is done and they click exit- you can direct them back to any page you wish.
Click on this link-
http://pptfaq.com/FAQ00428.htm
Then click on the Michael Koerner's PPT to HTML Tutorial and view the short video. Really shows what you can accomplish. Then at the end you can download the full instructions. Very cool.
Cheers-
Andy