(function(){
    shuffle = function(array) {
        var i = array.length;
        while(i){
            var j = Math.floor(Math.random()*i);
            var t = array[--i];
            array[i] = array[j];
            array[j] = t;
        }
        return array;
    }

    var ads = [{"src":"http:\/\/www.ucchari.com\/bn\/2chm\/adf04.gif","alt":"\u30b2\u30fc\u30e0\u306e\u3088\u3046\u306a\u51fa\u4f1a\u3044","target":"_blank","weight":1,"url":"http:\/\/ad.heypo.com\/click\/202"},{"src":"http:\/\/www.ucchari.com\/bn\/erogoo\/1500en.jpg","alt":"\u767b\u9332\u3059\u308b\u3060\u3051\u30671500\u5186\u5206\u306e\u30dd\u30a4\u30f3\u30c8\u304c\u305f\u3060\u3067\u3082\u3089\u3048\u308b\uff01","target":"_blank","weight":3,"url":"http:\/\/ad.heypo.com\/click\/959"},{"src":"http:\/\/www.ucchari.com\/bn\/2chm\/adf02.gif","alt":"\u767b\u9332\u7121\u6599\uff01\u3061\u3087\u3063\u3074\u308a\u30a8\u30c3\u30c1\u306a\u5927\u4eba\u306e\u30ea\u30a2\u30eb\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30fc","target":"_blank","weight":1,"url":"http:\/\/ad.heypo.com\/click\/703"}];
    if (ads.length < 1) return;

    var tmp = [];
    for (var i = 0; i < ads.length; i++) {
        for (var j = 0; j < ads[i].weight; j++) {
            tmp.push(ads[i]);
        }
    }

    var ad = shuffle(tmp).shift();
    document.getElementById('ad-zone-21').innerHTML = '<a href="' + ad.url +'" target="' + ad.target +'"><img src="' + ad.src +'" alt="' + ad.alt +'" /></a>';
})();