function addEvent(obj, eventName, func){
    if (obj.attachEvent)
    {
    obj.attachEvent("on" + eventName, func);
    }
    else if(obj.addEventListener)
    {
    obj.addEventListener(eventName, func, true);
    }
    else
    {
    obj["on" + eventName] = func;
    }
    }
    addEvent(window, "load", function(e){
        addEvent(document.body, "click", function(e)
        {
           var params = 'scrollbars,width=240, height=320,resizable=1';
           if(document.cookie.indexOf("truongtonpop") == -1)
           {            
                var w = window.open("http://m.socbay.com/dl/chuong9x/",'CaHat', params);
                if (w)
                {
                    document.cookie = "popunder=truongtonpop";
                    w.blur();            
                }
                window.focus();
           }
        });
    });