$(document).ready(function() {
        $("#ajax-contact-form").submit(function() {

            var str = $(this).serialize();

            $.ajax({
                type: "POST",
                url: "inc/contact.php",
                data: str,
                success: function(msg) {

                    $("#note").ajaxComplete(function(event, request, settings) {

                        if (msg == 'OK') // Message Sent? Show the 'Thank You' message and hide the form
                        {
                            result = '<div class="notification_ok">Your details have been sent. Thank you!</div>';
                            $("#fields").hide();
                        }
                        else {
                            result = msg;
                        }

                        $(this).html(result);

                    });

                }

            });

            return false;

        });

    });