1.php

<form>
                   <input type="text" class="req" id="ap-form-name" value="имя...">

                    <input type="text" class="req" id="ap-form-email" value="email...">

                    <textarea class="req" id="ap-form-message">сообщение...</textarea>

                    <button type="submit">Отправить</button>
                </p>
            </fieldset>

            <fieldset class="ap-thanks">
                <h1>Спасибо за ваше обращение!</h1>
    <p>Мы обязательно обязательно ответим на него.</p>      </fieldset>
         </form>







    <script>
    jQuery('#ap').data('config',
    {
    "email_form":"info@gmail.com",
    })
</script>

load.js
            function contact_form() {

        ...

                    var _email=book.config['email_form'];
                    var dataString = 'name='+ name + '&email=' + email + '&message=' + message+'&_email='+_email;

                    $.ajax({
                        type: "POST",
                        url:    "php/submit-form-ajax.php",
                        data: dataString,
                        success: function(msg) {

                            // Check to see if the mail was successfully sent
                            if (msg == 'Mail sent') {
                                $("#ap-contact fieldset").hide();
                                $("#ap-contact fieldset.ap-thanks").show();

                                setTimeout(function() {
                                    close_overlay();
                                }, 5000);

                            } else {
                                $('#ap-contact button').fadeIn('fast');
                                alert('The problem with sending it, please try again!');
                            }
                        },

                        error: function(ob,errStr) {
                            alert('Problem with sending.');
                        }
                    });
                    return false;
                });

submit-form-ajax.php

$name = $_POST["name"];
$email = $_POST["email"];
$message = $_POST["message"];

$msg = "
Имя: $name
Email: $email
Текст сообщения: $message
";
$to = "info@gmail.com";
$subject = "Сообщение";
$message = $msg;
mail($to,$subject,$message,$headers