学步园

    <script for="window" event="onload" language="javascript">
        initAd();//载入页面后，调用函数initAd()
    </script>

    <script language="javascript">
        function initAd()
        {
            var adlayer = document.all.AdLayer;
            document.all.AdLayer.style.posTop = "-200";
            adlayer.style.visibility = "visible";
            MoveLayer();
        }
        function MoveLayer()
        {
                var x = 10;
                var y = 300;
                var diff = (document.documentElement.scrollTop + y - document.all.AdLayer.style.posTop)*.40;
　　        var y = document.documentElement.scrollTop + y - diff;
　　        eval("document.all.AdLayer.style.posTop = y");
　　        eval("document.all.AdLayer.style.posLeft = x");//移动广告层
　　        setTimeout("MoveLayer();", 20);//设置20毫秒后再调用函数MoveLayer()
        }
    </script>

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    <div id="AdLayer" style="position: absolute; width: 61px; height: 59px; z-index: 20;
        visibility: hidden; left: 600px; top: 300px">
        <a href="http://www.lebeay.com">
            <img src="img/temp_003.jpg" border="0" height="60" width="60" />
        </a>
    </div>