function loadListrak(listTrackId) {
    if (listTrackId != null && listTrackId != "") {
        var biJsHost = (("https:" == document.location.protocol) ? "https://" : "http://");
        (function (d, s, id, tid, vid) {
            var js, ljs = d.getElementsByTagName(s)[0];
            if (d.getElementById(id)) return;
            js = d.createElement(s);
            js.id = id;
            js.src = biJsHost + "cdn.listrakbi.com/scripts/script.js?m=" + tid + "&v=" + vid;
            ljs.parentNode.insertBefore(js, ljs);
        })(document, 'script', 'ltkSDK', listTrackId, '1');

        (function (d) {
            if (document.addEventListener) document.addEventListener('ltkAsyncListener', d);
            else {
                e = document.documentElement;
                e.ltkAsyncProperty = 0;
                e.attachEvent('onpropertychange',
                    function (e) {
                        if (e.propertyName == 'ltkAsyncProperty') {
                            d();
                        }
                    });
            }
        })(function () {
            _ltk.SCA.CaptureEmail("customer\\.email");
        });
    }
}