function setCookie(c_name, value, expiredays) {
    var exdate=new Date();
    exdate.setDate( exdate.getDate()+expiredays );

    document.cookie = c_name + "=" + escape(value) + ( (expiredays == null) ? "" : ";expires="+exdate.toUTCString() );
}

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 "";
}

function delCookie(c_name) {
    setCookie(c_name, "", 1);
}