get/set UTF-8 cookie

function getCookie(name) {
    var matches = document.cookie.match(new RegExp("(?:^|; )" + name.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1') + "=([^;]*)"));
    return matches ? decodeURIComponent(unescape(matches[1])) : undefined;
}
function setCookie(name, value, expires) {
    document.cookie = name + "=" + escape(value) + "; path=/" + ((expires == null) ? "" : "; expires=" + expires.toGMTString());
}