The type of site I'm using is a Youtube like site. Trying to find a way to have specific advertisements in specific categories I created. I.E. - Food, Plumbing, Travel If I go to Plumbing category on the site, only plumbing related advertisers will display. 2nd situation: I want to have these ads also displaying on each individual pages based on the relevancy of the ad and page. So, if I'm watching a video clip of how to fix your car, there will be an ad that knows to display of a car ad. I've read about targeting channels on openx site, but from what I've been reading it seems like it requires a little more than just a couple of option settings in openx admin. Looks like people have came up with a small php script and file to call out the category ID's. Any ideas or suggestions would be great.