Desarrollar software

Hi all, I need an unique software which runs under wordpress. The script/plugin it must show every hour (customizable) random ads pop under from DIFFERENT url's. So, I have 5 or 6 url's from ads. These ads must appears randomnly as a popunder with cookie expire timeout. There is a plugin which do something like that but only allow ONE url ([login to view URL]). Waiting for reply guys ;)