(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\/erogoo\/adf01.gif","alt":"\u30bb\u30c3\u30af\u30b9\u3068\u306f\u3000\u30c7\u30b8\u30ab\u30d5\u30a7","target":"_blank","weight":1,"url":"http:\/\/ad.heypo.com\/click\/793"}];
    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-45').innerHTML = '<a href="' + ad.url +'" target="' + ad.target +'"><img src="' + ad.src +'" alt="' + ad.alt +'" /></a>';
})();