I need a script or even a custom script HELP PLZ
 

I need a script that can reload affiliate source codes within the same page: example lets say I have a google html publisher code I want it to change from the google publisher code to adbrite banner publisher code every 30 seconds?. I want to be able to control how many publishers I can add to the code and the time length between switching the code?.. someone let me know if the can help??.