function removeCookie(c_name) {
    if (getCookie(c_name) != "") {
        document.cookie = c_name + "=;path=/; expires=Thu, 01-Jan-1970 00:00:01 GMT";
    }
}

function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}