var focus = true;
window.onfocus = function() {focus = true;};
window.onblur = function() {focus = false;};
MPP.client.ws.onmessage = function(message) {
    if (typeof message.data === "string") {
        message = JSON.parse(message.data);
        if (message[0].m == "a") {
            if (Notification.permission == "granted") {
                if (!focus) {
                    new Notification("Message", {body: message[0].a});
                }
            } else if (Notification !== "denied") {
                Notification.requestPermission(function (permission) {
                    if (permission === "granted") {
                        new Notification("Now I will annoy you.", {body: "It is true"});
                    }
                });
            }
        }
    }
};