if($reachByPOST && $okay == true && $NotExistingUsername == true && $NotExistingEmail == true) {
    $sql = "INSERT INTO user_info SET user_id = '',user_name = '".$_POST['username']."',password = '".$_POST['password']."',email = '".$_POST['email']."'";
    $res = mysql_query($sql);
    $_SESSION['user_id'] = $userid;
    $sql2 = "INSERT INTO acct_info SET user_id = '".$userid."'";
    $res2 = mysql_query($sql2);
}