phpBB port phpnuke - autoposter

Hello, I require a software that can automatically post a predefined text into a phpBB thread using the credentials I specify. The software must allow me to specify when (E.g every hour, every minute, every two hours, etc.) I'm indifferent to the language used and to if it is done via a program or an extension of Firefox. I will use the application to "bump" my threads on a forum that I frequent. Please ask questions and do not bid if you do not have experience. Thanks.