Countdown javascript

<script type="text/javascript">
 var serverTime = <?php echo time();?>  * 1000;
 var gotobuy=0,gotopay=0;
 var timeout=null;
 $(function(){ 
     var dateTime = new Date(); 
     var difference = dateTime.getTime() - serverTime;
      
      timeout = setInterval(function(){ 
       $(".endtime").each(function(){ 
         var obj = $(this); 
         var endTime = new Date(parseInt(obj.attr('value')) * 1000); 
         var nowTime = new Date(); 
         var nMS=endTime.getTime() - nowTime.getTime() + difference; 
         var myD=Math.floor(nMS/(1000 * 60 * 60 * 24)); //天 
         var myH=Math.floor(nMS/(1000*60*60)) % 24; //小时 
         var myM=Math.floor(nMS/(1000*60)) % 60; //分钟 
         var myS=Math.floor(nMS/1000) % 60; //秒 
         var myMS=Math.floor(nMS/100) % 10; //拆分秒 
         if(myD>= 0){
             varstr = (myD> 0 '< span>' + myD + '</ span> day':? '') + ' <span>' + myH + '</ span> h <span>' + myM + ' </ span> min <span> '+ myS +' </ span> s <span> '+ myMS +' </ span> ' ; 
            // countdown 
         } the else { 
　　　　　　// countdown 
            window.clearInterval (timeout); 
            var STR =' <span > 0 </ span> h <span> 0 </ span> min <span> 0 </ span> sec ' ;
            
         } 
         obj.html (STR); 
       }); 
     }, 100 ); 

 }); 
</ Script>