function initAd() {
    $("#AdLayer").css("top", "220px"); //设置onLoad事件激发以后，广告层相对于固定后的y方向位置
    $("#AdLayerleft").css("top", "220px");
    MoveLayer('#AdLayer'); //调用函数MoveLayer() 
}

function MoveLayer(layerName) {
    var x = 1; //浮动广告层固定于浏览器的x方向位置 
    var y = 152; //浮动广告层固定于浏览器的y方向位置 

    var xVal, yVal;
    if (document.body.scrollTop) {
        xVal = document.body.scrollLeft;
        yVal = document.body.scrollTop;
    }
    else {
        xVal = document.documentElement.scrollLeft;
        yVal = document.documentElement.scrollTop;
    }

    var diff = (yVal + y - $(layerName).position().top) * 0.4;
    var y = yVal + y - diff;

    $(layerName).css("top", y);
    $(layerName).css("left", x);//移动广告层 
    setTimeout("MoveLayer('#AdLayer');", 20); //设置20毫秒后再调用函数MoveLayer() 
}