Automatic posting script

I'm looking for a php script that will create a thread in the category I specify in the board I specify (for example in Domain News at [login to view URL] or Domain Name Discussion at [login to view URL]) using the username and password I specify and the text I provide. If a captcha appears I want to put the captcha in front of the end user to fill in (in other words the form submit on the site needs to be scraped and put in front of the end user if it has a captcha on it). That's it. Much, much more work if this gets done right. Email with questions. Thanks, Matt