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在<head></head>之间加上如下代码：
<Script Language="javascript">
image = new Array(4); //定义image为图片数量的数组
image [0] = tu0.gif //背景图象的路径
image [1] = tu1.gif
image [2] = tu2.gif
image [3] = tu3.gif
image [4] = tu4.gif
number = Math.floor(Math.random() * image.length);
document.write("<BODY BACKGROUND="+image[number]+">");
</Script>
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