Replace with this for the last step :
$db->query("INSERT INTO users (username, login_name, userpass, level, money, crystals, donatordays, user_level, energy, maxenergy, will, maxwill, brave, maxbrave, hp, maxhp, location, gender, signedup, email, bankmoney, lastip, lastip_signup) VALUES ( '{$username}', '{$username}', md5('{$_POST['password']}'), 1, $money, $crystals, $donor, 1, 12, 12, 100, 100, 5, 5, 100, 100, 1, '{$_POST['gender']}', unix_timestamp(), '{$_POST['email']}', -1, '$IP', '$IP')");