JS实现倒计时

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>JS实现倒计时(时、分，秒)</title>
    <script language="javascript" type="text/javascript">
        var interval = 1000;
        function ShowCountDown(year,month,day,divname)
        {
var now = new Date();
            var endDate = new Date(year, month-1, day);
            var leftTime=endDate.getTime()-now.getTime();
            var leftsecond = parseInt(leftTime/1000);
            var day1=Math.floor(leftsecond/(60*60*24));
            var hour=Math.floor((leftsecond-day1*24*60*60)/3600);
            var minute=Math.floor((leftsecond-day1*24*60*60-hour*3600)/60);
            var second=Math.floor(leftsecond-day1*24*60*60-hour*3600-minute*60);
            var cc = document.getElementById(divname);
            cc.innerHTML = "脚本之家提示距离"+year+"年"+month+"月"+day+"日还有："+day1+"天"+hour+"小时"+minute+"分"+second+"秒";
        }
        window.setInterval(function(){ShowCountDown(2010,4,20,'divdown1');}, interval);
    </script>
</head>
<body>
<div id="divdown1"></div>
</body>
</html>
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