JavaScript倒计时自动跳转

<div id="ShowDiv" align="left" class="tishi"></div>
	<div align="left">
    	group edit page
     </div>
<script language='javascript' type='text/javascript'>    
var secs =5; //倒计时的秒数    
var URL ;    
function Load(url){    
URL =url;    
for(var i=secs;i>=0;i--)    
{    
window.setTimeout('doUpdate(' + i + ')', (secs-i) * 1000);    
}    
}    
function doUpdate(num)    
{    
document.getElementById('ShowDiv').innerHTML = '将在'+num+'秒后自动跳转到 指定页面' ;    
if(num == 0) { window.location.href=URL; }    
}    
</script>  
<script language="javascript">    
Load("www.baidu.com"); //要跳转到的页面    
</script>