var name = "rt_yamaha";
var domain = ".yamaha.com";
var period = 90;
var expires = getExpireTime();

if (document.cookie) {
    var cookies = document.cookie.split("; ");
    var value = null;

    for (var i = 0; i < cookies.length; i++) {
        var str = cookies[i].split("=");

        if (str[0] == name) {
            var value = unescape(str[1]);
            break;
        }
    }

    if (value == null) {
        setCookie(getValue());
    } else {
        setCookie(value);
    }
} else {
    setCookie(getValue());
}

function setCookie(value) {
    document.cookie = name + "=" + escape(value) + "; expires=" + expires + "; path=/; domain=" + domain;
}


function getExpireTime() {
    var nowtime = new Date().getTime();
    var clear_time = new Date(nowtime + (60 * 60 * 24 * 1000 * period));
    return clear_time.toGMTString();
}

function getValue() {
    var dateobj = new Date;
    var result = dateobj.getTime();
    var len = 35;
    var source = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    var sourceLen = source.length;
    for (var i = 0; i < len; i++) {
        result += source.charAt(Math.floor(Math.random() * sourceLen));
    }
    return result;
}