倒计时跳转

<script type="text/javascript">
    var start = 5;
    var step = -1;
    function count() {
        document.getElementById("div1").innerHTML = "页面在" + start
                + "秒后返回录入页面";
        start += step;
        if (start <= 0) {
            start = 5; 
            window.location = "regist.jsp";//重定位  
        }
        setTimeout("count()", 1000);
    }
    window.onload = count;
</script>