一款jquery倒计时

<script type="text/javascript"> 
        var timeIndex = 100;//总的分钟数 
        $(document).ready(function(){ 
            var regex = /dateTime=(\d+)/; 
            setTime(); 
            setInterval(setTime, 1000);//每秒执行一次 
        }); 
        function setTime(){ 
            var hour = parseInt(timeIndex / 3600); 
            var minutes = parseInt((timeIndex % 3600) / 60); 
            var seconds = parseInt(timeIndex % 60); 
            hour = hour < 10 ? "0" + hour : hour; 
            minutes = minutes < 10 ? "0" + minutes : minutes; 
            seconds = seconds < 10 ? "0" + seconds : seconds; 
            $("#divTime").text(hour + ":" + minutes + ":" + seconds); 
            if(timeIndex>0){ 
                timeIndex--; 
            } 
            $("#linkTime").attr("href", url + timeIndex); 
        }