PHPBB2 Login Integration

I need to use my current login system (see attached) and at the sam time loginto the PHPBB2 forum. Relative to my login, the PHPBB forum is located in a subfolder : /forum I use the PHPBB user table for my current login, theresore the username and passwords will always be the same. I have attached my current login page as it should be the only file you need. I need this job done as soon as possible. Don't hesitate to reply with any questions, please onlly reply if you know how to do this and can do it fast. Thank you