Send mail without Plugins and with Javascript

Hi,

I have a problem, I have a form in mi front-end with 3 fields and a submit button. This submit button has to send me an email.
I dont want to use more plugins, this is a very simple form.
I only need send this form without reloading the page, so i need JS and AJAX, but, it doesn′t work…

I have this in my index.php:

<form method="post" name="fcontacto" id="fcontacto" action="<?php the_permalink(); ?>" >
<div class="fcontacto">
                                                                                <fieldset class="contact-form">
                                                                                    <p class="form-group">
                                                                                        <label id="lblName" for="txtName">
                                                                                            Nombre
                                                                                        </label>
                                                                                        <input type="text" tabindex="1" id="txtName" name="txtName">
                                                                                    </p>
                                                                                    <p class="form-group">
                                                                                        <label id="Email" for="txtEmail">
                                                                                            Email
                                                                                        </label>
                                                                                        <input type="text" tabindex="2" id="txtEmail" name="txtEmail">
                                                                                    </p>
                                                                                    <p class="form-group">
                                                                                        <label id="lblPostcode" for="txtPostcode">
                                                                                            Código Postal
                                                                                        </label>
                                                                                        <input type="text" tabindex="3" id="txtPostcode" name="txtPostcode">
                                                                                    </p>
                                                                                    <input type="submit" class="btn btn-default" tabindex="7" id="submit" value="Enviar" name="submit">
                                                                                    <div id="respuesta" style="display:none;"></div>

                                                                                </fieldset>
                                                                            </div>
</form>

This in my custom.js:

$(document).ready(function(){
	$("#fcontacto").submit(function( event ){
		event.preventDefault();
		$.ajax({
			type: 'POST',
			url: '../send.php',
			data: $(this).serialize(),
			success: function(data){
				$("#respuesta").slideDown();
				$("#respuesta").html(data);
			}
		});
		return false;
	});

});

And this in my send.php:

<?php
require '../../../class.phpmailer.php';
$mail = new PHPMailer;
$to = "[email protected]"; // Nuestro correo de contacto
// recogeremos los datos del formulario
$nombre = $_POST['txtName'];
$email = $_POST['txtEmail'];
$asunto = $_POST['txtPostcode'];
if($nombre == "" || $email == "" || $asunto == ""):
echo '<div class="alert alert-danger">Todos los campos son requeridos para el envio</div>';
else:
$mail->From = $email;
$mail->addAddress($to);
$mail->Subject = $asunto;
$mail->isHtml(true);
$mail->Body = '<strong>'.$nombre.'</strong> le ha contactado desde su web, y le ha enviado el siguiente mensaje: <br><p></p>';
$mail->CharSet = 'UTF-8';
$mail->send();
endif;
?>