[AJAX]Niedziałający formularz - brak reakcji Opcje

[Matt23]

Witam, posiadam taki oto kod

[HTML] pobierz, plaintext 
<form id="mail">
        <input id="sender_name" type="text" class="feedback-input">
        <input id="sender_address" type="text" class="feedback-input" pattern="[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+\.[a-zA-Z]{2,4}" required>
        <input id="recipient_address" type="text" class="feedback-input" pattern="[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+\.[a-zA-Z]{2,4}" required>
        <input id="subject" type="text" class="feedback-input" required>
        <textarea id="content" class="feedback-input" required></textarea>
        <input type="submit" value="Send">
        <div id="result"></div>
    </form>
[HTML] pobierz, plaintext 

Do tego ajax

[PHP] pobierz, plaintext 
$(document).ready(function() {
    $("#mail").submit(function(event) {
        var sender_name = $('#sender_name').val();
        var sender_address = $('#sender_address').val();
        var recipient_address = $('#recipient_address').val();
        var subject = $('#subject').val();
        var content = $('#content').val();
 
        $.ajax({
                type: 'POST',
                url: 'mail.php',
                data: {
                    sender_name: sender_name,
                    sender_address: sender_address,
                    recipient_address: recipient_address,
                    subject: subject,
                    content: content
                }
            })
            .done(function(response) {
                console.log('Ajax success');
                var message = response === "OK" ? "Poszło" : "Error";
                $('#result').val(message);
            })
            .fail(function() {
                console.log('Ajax error');
            });
    });
});
[PHP] pobierz, plaintext 

I plik mail.php o zawartości

[PHP] pobierz, plaintext 
<?
echo 'OK';
?>
[PHP] pobierz, plaintext 

Formularz po wysłaniu zeruje swoje pola, nie przypisuje niczego do pola #result, a konsola wyglada tak:

(IMG:http://i.imgur.com/1hwR3if.png)

Proszę o pomoc.

[Pyton_000]

dodaj
event.preventDefault();
przed var'ami

dodaj msg do funkcji fail i zrób consol.log z niej.