Just delete the reference to that file on confirm.php on line 50. I'm assuming it is using MySQLi as well. That is the page I actually had to look at to confirm.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.