Automatic forum poster

I am looking for a Windows based forum poster script that can post automatically (at pre-determined intervals, lets say every 15 minutes or so) to vbulletin, phpnn and other message boards. Must be able to post messages containing URLs, pictures and tags. Please let me know if you have anything that can do all of the above. It should work with existing usernames/passwords of different boards so does not need to bypass registration etc. However it must be able to store URLs and login credentials of at least 25 message boards and also at least 25 "comments or messages" to function in full automatic mode. The objective of this script will be to automate posting of messages at various boards so that it acts as a paid forum poster, not as a spammer. That is why it does not need to bypass registration or create fake nicks. However it must be able to handle what has been described above FLAWLESSLY. Please bid ONLY if you a have a reasonable working demo. All posts without demo will be ignored. I will provide you with names of 2 boards where you will have to post using this script before selling it. I will also need full source code. Once again, do not waste your time if you do not have a working demo.