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var bg_dir = 'http://law.dnscq.cn/img/'; // 存放圖片的資料匣
var bg_arr = new Array("big.jpg","big1.jpg","big2.jpg","big3.jpg"); // 欲顯示圖片的檔名

var num = Math.floor(Math.random()*(bg_arr.length));
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document.writeln("#sp_bg{");
document.writeln(" background:url(" + bg_dir + bg_arr[num] + ");");
document.writeln(" width:349px; height:250px;");
document.writeln(" margin: 0;");
document.writeln(" float: left;");
document.writeln("}");
document.writeln("</style>");
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      <param name="wmode" value="transparent">
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