1.将下面的代码复制到 <body> 内

2.在<body>中加入
<div id="screensize" style="position: absolute; top: 0; left: 0; height: 100%; width: 100%">
<p><img id="ball" SRC="http://dynamicdrive.com/plane.gif" style="container:in-flow;position:relative;left:-100;top:0;visibility:show">

3.将<body>改为
<body onload=Ypick()>