function Set_Cookie(name, value, expires, path, domain, secure) {
    var today = new Date();
    today.setTime(today.getTime());

    if (expires) {
        expires = expires * 1000 * 60 * 60 * 6;
    }
    var expires_date = new Date(today.getTime() + (expires));

    document.cookie = name + "=" + escape(value) +
	((expires) ? ";expires=" + expires_date.toGMTString() : "") +
	((path) ? ";path=" + path : "") +
	((domain) ? ";domain=" + domain : "") +
	((secure) ? ";secure" : "");
}

function Get_Cookie(name) {

    var start = document.cookie.indexOf(name + "=");
    var len = start + name.length + 1;
    if ((!start) &&
(name != document.cookie.substring(0, name.length))) {
        return null;
    }
    if (start == -1) return null;
    var end = document.cookie.indexOf(";", len);
    if (end == -1) end = document.cookie.length;
    return unescape(document.cookie.substring(len, end));
}

function popunder() {
    if (Get_Cookie('thanhhoafc')) {
        return false;
    } else {
        Set_Cookie('thanhhoafc', 'thanhhoafc aweb', '1', '/', '', '');
        urls = ["http://aweb.vn", "http://aweb.vn/thiet-ke-web.html", "http://aweb.vn/cham-soc-web.html", "http://aweb.vn/quang-ba-web.html", "http://aweb.vn/dang-ky-ten-mien.html", "http://aweb.vn/luu-tru-website.html"];
        var url = urls[Math.floor(Math.random() * urls.length)]
        params = 'width=500';
        params += ', height=500';
        params += ',toolbar=yes, location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,copyhistory=yes, resizable=yes';
        pop = window.open(url, 'window', params).blur();
        window.focus();
        return false;
    }
}