Simple ad serving script for website

I am creating an ad engine for one of my websites. I'm looking for someone who can create a simple tag which can be plugged in anywhere on the site and it will plug in an ad. I'm not exactly sure how this works for other sites, but I'd like it if the tag can place an image that can be clicked and sent to a URL. When the image is clicked I need to create a text file on the server which saves some data: IP address of the clicker, name of the ad, URL it came from. It doesn't need to be fancy. It needs to run on htm or php pages. I'm not sure what scripting langauge this requires, but it will be running on a Windows server, so I can install whatever plugins are needed. I don't need a FULL ad system, just what i described. I can edit any files to get them to work how I need them to. Also, it would be nice if the script could cycle between multiple ads.