<html>  
<body>  
页面将在<span id='remaining_time'></span>秒后自动跳转...  
</body>  
<script type="text/
javascript">
/**
* setTimeout 实现倒计时
* by www.jb200.com
*/
var remaining_time = document.getElementById('remaining_time');  
var t = 6;  
function changeTime(){  
    t--;  
    remaining_time.innerHTML=" "+t+" ";  
    if(t==0){  
            window.location.href = 'http://www.jb200.com';  
            return;  
    }  
    setTimeout('changeTime()', 1000);  
}  
changeTime();  
</script>  
</html>