I know there are a lot of techies on this site so I'm gonna throw my dilemma out here.My organization wants to be able to display switched sources on one tv. They want to display Powerpoint slides for 5 minutes, then have it automatically switch over to showing CNN for 10 minutes. I already have a computer setup, cable tuner, and a tv panel. I just need to know what I need to get them to interface on a time delay.Help?