Code:
try {
    var xhr;
    var t = new Date().getTime();
    var status = "start";
    var timing = new Array(3);
    window.onunload = function() {
        timing[2] = "r:" + (new Date().getTime() - t);
        document.createElement("img").src = "/_Incapsula_Resource?ES2LURCT=67&t=78&d=" + encodeURIComponent(status + " (" + timing.join() + ")")
    };
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest
    } else {
        xhr = new ActiveXObject("Microsoft.XMLHTTP")
    }
    xhr.onreadystatechange = function() {
        switch (xhr.readyState) {
            case 0:
                status = new Date().getTime() - t + ": request not initialized ";
                break;
            case 1:
                status = new Date().getTime() - t + ": server connection established";
                break;
            case 2:
                status = new Date().getTime() - t + ": request received";
                break;
            case 3:
                status = new Date().getTime() - t + ": processing request";
                break;
            case 4:
                status = "complete";
                timing[1] = "c:" + (new Date().getTime() - t);
                if (xhr.status == 200) {
                    parent.location.reload()
                }
                break
        }
    };
    timing[0] = "s:" + (new Date().getTime() - t);
    xhr.open("GET", "/_Incapsula_Resource?SWHANEDL=619090729563242437,7130199995494543674,7333643893109167629,458861", false);
    xhr.send(null)
} catch (c) {
    status += new Date().getTime() - t + " incap_exc: " + c;
    document.createElement("img").src = "/_Incapsula_Resource?ES2LURCT=67&t=78&d=" + encodeURIComponent(status + " (" + timing.join() + ")")
};