function dnBoxRefresh(callback) {
    var dn_ticket_boxes = document.getElementsByClassName("diginights-contentdelivery-box");

    var i;

    for (i = 0; i < dn_ticket_boxes.length; i++) {
        var box = dn_ticket_boxes[i];

        if (box.innerHTML.replace(/&nbsp;/gi, '').trim() === "") {
            var iframe = document.createElement('iframe');
            var random = Math.floor((Math.random() * 100000) + 100000);
            var iframe_id = "dn-iframe-" + random;
            var contentDeliveryUrl = "https://diginights.com/contentdelivery/eventlist/contentdeliveryslug".replace("contentdeliveryslug", box.dataset.contentdeliveryslug) + "?iframeid=" + random;

            if (typeof box.dataset.lang !== "undefined") {
                contentDeliveryUrl = contentDeliveryUrl.replace("/contentdelivery/", "/" + box.dataset.lang + "/contentdelivery/");
            }

            iframe.id = iframe_id;
            iframe.frameBorder = 0;
            iframe.scrolling = "no";
            iframe.width = "100%";
            iframe.style.border = "0px";
            iframe.setAttribute("src", contentDeliveryUrl);

            box.appendChild(iframe);
        }
    }
    if (callback) callback();
}

window.onload = function() {
    dnBoxRefresh();
}

if (typeof eventTicket == 'undefined') {
    var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
    var eventTicket = window[eventMethod];
    var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
    eventTicket(messageEvent, function(e) {
        if ('https://diginights.com' === e.origin) {
            if (parseInt(e.data[1]) && document.getElementById("dn-iframe-" + e.data[0])) document.getElementById("dn-iframe-" + e.data[0]).height = e.data[1] + "px";
        }
    }, false);
}