<script language="javascript">
    var num = 5; //倒计时的秒数
   // var URL = "http://www.baidu.com";
   var URL="index.php";
    window.setTimeout("doUpdate()", 1000);
    function doUpdate(){
        if(num != 0){
           // document.getElementById('page_div').innerHTML = '将在'+num+'秒后自动跳转到首页' ;
            num --;
            window.setTimeout("doUpdate()", 1000);
        }else{
            num = 5;
           // window.location = URL;  //5秒后跳转到登录页面
        }
    }
	</script>