图片广告随机显示代码

<script language="JavaScript" type="text/javascript">
//随机显示广告代码
tips = new Array(4);
tips[0] = '<a href="http://www.skylm.com/" target="_blank"><img src="images/01.jpg" border="0" /></a>';
tips[1] = '<a href="http://www.skylm.com/" target="_blank"><img src="images/02.jpg" border="0" /></a>';
tips[2] = '<a href="http://www.skylm.com/" target="_blank"><img src="images/03.jpg" border="0" /></a>';
tips[3] = '<a href="http://www.skylm.com/" target="_blank"><img src="images/04.jpg" border="0" /></a>';
index = Math.floor(Math.random() * tips.length);
document.write(tips[index]);
</script>