Script broke...

[allanon]

Hey, I changed my login script a bit, and it broke. Every time I post the correct login details, the script doesn't execute. Whenever I post incorrect details, it executes? It's probably a stupid error that I keep missing.

Anyone see anything wierd?

session_start(); 
$status_font_color = '990000'; 
$status = 'Please login.'; 
if(!empty($_GET['f'])) { 
    $page = $domain . $_GET['f']; 
} else { 
    $page = $domain . '/affiliates/account.php'; 
} 
if(!empty($_SESSION['user_id']) && !empty($_SESSION['username'])) { 
    Redirect($domain . '/affiliates/account.php'); 
} 
if(isset($_POST['Login'])) { 
    echo '<!-- Made Pt 1 -->';
    $username = addslashes($_POST['username']); 
    $password = md5($_POST['password']); 
    if(empty($_POST['username']) || empty($_POST['password'])) { 
        $continue = false; 
        $status = 'Empty username or password.'; 
        $status_font_color = 990000; 
    } 
    if($continue !== false) { 
        if(!preg_match("/^[a-z0-9_]/", $_POST['username'])) { 
            $continue = false; 
            $status = 'Invalid syntax. Only use letters "A" through "Z", and numbers "1" through "10".'; 
            $status_font_color = 990000; 
        } 
    }
    if($continue !== false) { 
        $SELECT = mysql_query("SELECT * FROM affiliate_users WHERE username = '$username' AND password = '$password'") or die($error); 
        echo '<!-- Made Pt 2 -->';
        if(mysql_num_rows($SELECT) == 1) { 
            $_SESSION['username'] = $_POST['username']; 
            $_SESSION['user_id'] = $fetched_userid; 
            $_SESSION['last_move'] = time() + 300; 
            Redirect($page); 
        } else { 
            $status = 'Invalid username/password combination. Please try again.'; 
            $status_font_color = 990000; 
        } 
    } 
} 

The echo'ed comments are to check how far it got.

[allanon]

oO, noticing something, I did not fill in the variable $fetched_userid, which probably is Redirecting twice from a checking script =(. So I probably just solved my error.