web page count down

<script type="text/javascript">
var secs = 9;
var wait = secs * 1000;
$('rulebutton').innerHTML = "请仔细阅读以上的注册许可协议 (" + secs + ")";
for(i = 1; i <= secs; i++) { window.setTimeout("update(" + i + ")", i * 1000); } window.setTimeout("timer()", wait); function update(num, value) { if(num == (wait/1000)) { $('rulebutton').innerHTML = "请仔细阅读以上的注册许可协议"; } else { printnr = (wait / 1000) - num; $('rulebutton').innerHTML = "请仔细阅读以上的注册许可协议 (" + printnr + ")"; } } function timer() { $('rulebutton').innerHTML = ' ';
}