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<!-- Scripts -->
    <script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $('#signup').submit(function() {
                $("#success-message").html("Adding your email address...");
                $.ajax({
                    url: 'inc/store-address.php', // proper url to your "store-address.php" file
                    data: $('#signup').serialize() + '&ajax=true',
                    success: function(msg) {
                        $('#success-message').html(msg);
                    }
                });
                return false;
            });
        });
    </script>
  </head>
<body>
  <!-- Video -->
  <div class="hero">
    <div class="hero_background" date-native-currency="USA" aria-hidden="true">
      <video poster="image/black.png" autoplay="true" muted="" loop>
        <source src="videos/youtube.mp4" type="video/mp4">
        <source src="videos/youtube.webm" type="video/webm">
      </video>
    </div>
  </div>

  <!-- Email and Full Name -->
<div class="subscription_box cf">
    <div class="container">
      <form id="signup" role="form" action="index.html" method="get">
            <input class="text" id="fname" type="text" name="fname" placeholder="Full Name">
          <br>
            <input class="email" id="email" type="email" name="Email" placeholder="me@gmail.com">
          <br>
            <input class="button" id="submit" type="submit" value="Subscribe">
            <span id="success-message" class="ajax_response"></span> <!-- This is the success message -->
      </form>
    </div>
</div>

<?php // for MailChimp API v3.0

include('MailChimp.php');  // path to API wrapper downloaded from GitHub

use DrewMMailChimpMailChimp;

function storeAddress() {

    $key        = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxkey";
    $list_id    = "xxxxxxID";

    $merge_vars = array(
        'FNAME'     => $_POST['fname']
    );

    $mc = new MailChimp($key);

    // add the email to your list
    $result = $mc->post('/lists/'.$list_id.'/members', array(
            'email_address' => $_POST['email'],
            'merge_fields'  => $merge_vars,
            'status'        => 'pending'     // double opt-in
            // 'status'     => 'subscribed'  // single opt-in
        )
    );

    return json_encode($result);

}

// If being called via ajax, run the function, else fail

if ($_POST['ajax']) {
    echo storeAddress(); // send the response back through Ajax
} else {
    echo 'Method not allowed - please ensure JavaScript is enabled in this browser';
}