setCookie()

setCookie

    var setCookie = function (key, value, options) {
      var result = null, decode, days, t, i, pair, pairs, opts = options;
        // key and value given, set cookie...
        if (arguments.length > 1 && (value === null || typeof(value) !== "object")) {
            opts = opts || {};

            if (value === null) {
                opts.expires = -1;
            }

            if (typeof opts.expires === 'number') {
                days = opts.expires;
                t = opts.expires = new Date();
                t.setDate(t.getDate() + days);
            }
						document.cookie = [
							                encodeURIComponent(key), '=',
							                opts.raw ? String(value) : encodeURIComponent(String(value)),
							                opts.expires ? '; expires=' + opts.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
							                '; path='+(opts.path||'/'),
							                opts.domain ? '; domain=' + opts.domain : '',
							                opts.secure ? '; secure' : ''
							            ].join('');
            return (document.cookie);
        }

        // key and possibly options given, get cookie...
        opts = value || {};
        decode = opts.raw ? function (s) { return s; } : decodeURIComponent;
        pairs = document.cookie.split('; ');
        for (i = 0; i<pairs.length ; i++) {
          pair = pairs[i] && pairs[i].split('=');
          if (decode(pair[0]) === key) { result = decode(pair[1] || ''); i = pairs.length;} // IE saves cookies with empty string as "c; ", e.g. without "=" as opposed to EOMB, thus pair[1] may be undefined
        }
        return (result);
    };