<script type="text/javascript">

window.fbAsyncInit = function () {
      FB.init({
      appId: '4##############',
      xfbml: true,
      status: true,
      cookie: true,
      version: 'v2.11'
     });

    window.FB.Event.subscribe('edge.create', function (response) {
        jQuery("#fb-code input").val("<?php echo Mage::getStoreConfig('fbpromo/settings/couponcode'); ?>");
    });

    window.FB.Event.subscribe('edge.remove', function (response) {
        jQuery("#fb-code input").val("Code will appear here");
    });
    };

    (function (d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) {
        return;
    }
    js = d.createElement(s);
    js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));

    </script>