<!--要完成此效果把如下代码加入到<head>区域中-->
<SCRIPT language=javascript>
var use_title = new Array ()
use_title[1] = "随机标题一"
use_title[2] = "随机标题二"
use_title[3] = "随机标题三"
now = new Date()
num = (now.getSeconds()) % 3
num = num + 1
document.write('<title>'+ use_title[num] +'</title>')
</SCRIPT>
