var ad_left = $("#ad_left");
    if (ad_left.length > 0) {
        var ie6 = bbeng.(),
            position = bbeng.() ? "absolute" : "fixed";
        ad_left.css({
            "position": position,
            'top': bbeng.() - 130
        });
        ad_left.live('click', function () {
            $(window).scrollTop(0);
            return false;
        });
        $(window).resize(function () {
            var scrollTop = 0;
            if (ie6) {
                scrollTop = bbeng.();
            }
            ad_left.css('top', scrollTop + bbeng.() - 130);
        });
        
        $(window).scroll(function () {
            var ad_left = $("#ad_left");
            var scrollTop = bbeng.();
            if (ad_left.length > 0) {
                var displayType = ad_left.css("display");
                if (ie6) {
                    ad_left.css('top', scrollTop + bbeng.() - 130);
                }
            }
        });
    }
});
//签到函数
                        

var ad_left = $("#ad_left");//获得一个ID为ad_left的什么元素
    if (ad_left.length > 0) {//判断ad_left的长度
        var ie6 = bbeng.(),
            position = bbeng.() ? "absolute" : "fixed";
       //判断是否是IE6浏览器
       ad_left.css({
            "position": position,
            'top': bbeng.() - 130
        });//设置ad_left的css样式，估计ad_left是一个div，给这个div的顶端位置上移130个像素
        ad_left.live('click', function () {
            $(window).scrollTop(0);
            return false;
        });//写了一个click事件，目的是让浏览器窗口滚动条移到窗口顶部
        
        $(window).resize(function () {//浏览器窗口改变大小事件
            var scrollTop = 0;
            if (ie6) {如果是ie6
                scrollTop = bbeng.();//这个估计是获得滚动条当前的位置
            }
            ad_left.css('top', scrollTop + bbeng.() - 130);设置ad_left的位置上移130个像素
        });
        
        $(window).scroll(function () {//滚动条滚动事件
            var ad_left = $("#ad_left");
            var scrollTop = bbeng.();//获得滚动条位置
            if (ad_left.length > 0) {
                var displayType = ad_left.css("display");//获得ad_left的显示方式(display在css里控制显示方式)
                if (ie6) {
                    ad_left.css('top', scrollTop + bbeng.() - 130);//ad_left上移130个像素
                }
            }
        });
    }
});
这是JQuery的代码,这段代码如果没猜错的话估计是浮动广告的代码

膜拜 。。。。谢谢