<SCRIPT language=JavaScript>
bg = new Array(2); //设定图片数量,如果图片数为3,这个参数就设为2,依次类推
bg[0] = '../images/b-26.gif' //显示的图片路径,可用http://
bg[1] = '../images/b-19.gif'
bg[2] = '../images/b-3.gif'
index = Math.floor(Math.random() * bg.length);
document.write("<BODY BACKGROUND="+bg[index]+">");
</SCRIPT>
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