一个随机调用＜Iframe＞框架网页的JS代码

说明：下面第一行中的4是网页数量，自己看着办吧

<SCRIPT Language="JavaScript">

tips = new Array(4);

tips[0] = "1.htm";

tips[1] = "2.htm";

tips[2] = "3.htm";

tips[3] = "4.htm";

index = Math.floor(Math.random() * tips.length);

document.write("<iframe frameborder=0 src=" + tips[index] + " width=468 height=60 scrolling=no></iframe>");

</SCRIPT>