https://www.infoseek.co.jp/common/js/top_rat-1.1.js

1(function () {
2    var city_id = readCookie('TOP_WEATHER_AREA');
3    city_id = (city_id ? city_id : 'unselected');
4    var ratsCustomObj = '{\'weather_area\' : \'' + city_id + '\'}';
5    var ratCustomParameter = document.getElementById('ratCustomParameters');
6    if (ratCustomParameter) {
7        ratCustomParameter.value = ratsCustomObj;
8    }
9
10    function readCookie(name) {
11        var nameEQ = name + '=';
12        var ca = document.cookie.split(';');
13        for (var i = 0; i < ca.length; i++) {
14            var c = ca[i];
15            while (c.charAt(0) == ' ') {
16                c = c.substring(1, c.length);
17            }
18            if (c.indexOf(nameEQ) == 0) {
19                return c.substring(nameEQ.length, c.length);
20            }
21        }
22        return null;
23    }
24})();