【javascript】倒计时有关问题 【火狐浏览器】没有支持【如何修改】

【javascript】倒计时问题 【火狐浏览器】没有支持【怎么修改】
由于本人JS不好。所以JS写得笨了些。希望高手指教
JScript code

 <script language="JavaScript"> 
function ShowTimes(){ 
var AfterTime= new Date("12-11-2012 14:00:00"); //这里是北京上市会时间
LeaveTime = AfterTime - new Date(); 
var ne = document.getElementById("dh"); 
if(0 >= LeaveTime){
    clearInterval(id);
    ne.innerHTML="已开始";
    return false;
}
LeaveDays=Math.floor(LeaveTime/(1000*60*60*24)); 
LeaveHours=Math.floor(LeaveTime/(1000*60*60)%24); 
LeaveMinutes=Math.floor(LeaveTime/(1000*60)%60); 
LeaveSeconds=Math.floor(LeaveTime/1000%60); 
var c=new Date(); 
var q=c.getMilliseconds(); 
ne.innerHTML="距<font color=red>北京上市会</font>还有<font color=red>"
+LeaveDays+"</font>天 <font color=red>"
+LeaveHours+"</font>时 <font color=red>"
+LeaveMinutes+"</font>分 <font color=red>"
+LeaveSeconds+"</font>秒 <font color=red>"
+q+"</font>";
}
var id = setInterval(ShowTimes,10); 
</script>


 <script language="JavaScript"> 
function ShowTimesh(){ 
var AfterTimes= new Date("12-12-2012 14:00:00"); //这里是上海上市会时间
LeaveTimes = AfterTimes - new Date(); 
var ne = document.getElementById("sh"); 
if(0 >= LeaveTimes){
    clearInterval(id);
    ne.innerHTML="已开始";
    return false;
}
LeaveDays=Math.floor(LeaveTimes/(1000*60*60*24)); 
LeaveHours=Math.floor(LeaveTimes/(1000*60*60)%24); 
LeaveMinutes=Math.floor(LeaveTimes/(1000*60)%60); 
LeaveSeconds=Math.floor(LeaveTimes/1000%60); 
var c=new Date(); 
var q=c.getMilliseconds(); 
ne.innerHTML="距<font color=red>上海上市会</font>还有<font color=red>"
+LeaveDays+"</font>天 <font color=red>"
+LeaveHours+"</font>时 <font color=red>"
+LeaveMinutes+"</font>分 <font color=red>"
+LeaveSeconds+"</font>秒 <font color=red>"
+q+"</font>";
}
var id = setInterval(ShowTimesh,10); 
</script>





 <script language="JavaScript"> 
function ShowTimesh(){ 
var AfterTimes= new Date("12-13-2012 14:00:00"); //这里是广州上市会时间
LeaveTimes = AfterTimes - new Date(); 
var ne = document.getElementById("gz"); 
if(0 >= LeaveTimes){
    clearInterval(id);
    ne.innerHTML="已开始";
    return false;
}
LeaveDays=Math.floor(LeaveTimes/(1000*60*60*24)); 
LeaveHours=Math.floor(LeaveTimes/(1000*60*60)%24); 
LeaveMinutes=Math.floor(LeaveTimes/(1000*60)%60); 
LeaveSeconds=Math.floor(LeaveTimes/1000%60); 
var c=new Date(); 
var q=c.getMilliseconds(); 
ne.innerHTML="距<font color=red>广州上市会</font>还有<font color=red>"
+LeaveDays+"</font>天 <font color=red>"
+LeaveHours+"</font>时 <font color=red>"
+LeaveMinutes+"</font>分 <font color=red>"
+LeaveSeconds+"</font>秒 <font color=red>"
+q+"</font>";
}
var id = setInterval(ShowTimesh,10); 
</script>



<span id="dh" style="padding-left:220px;margin:5px;color:#000000; font-size:18px;" ></span>
<br/>

<span id="sh" style="padding-left:220px;margin:5px;color:#000000; font-size:18px;" ></span>
<br/>
<span id="gz" style="padding-left:220px;margin:5px;color:#000000; font-size:18px;" ></span>




------解决方案--------------------
HTML code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>azhong.com </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<style type="text/css">
   #liTimeLimit
   {
       font: 16px Arial, Helvetica, sans-serif;font-weight: bold;color: #00ff06;background-color: #000;height:20px;line-height:20px;width: 150px;text-align: center; margin-top:8px;
   }
</style>
</head>

<body>

离15:02 3/27/2013<span id="liTimeLimit">2<span class="witha">天</span> 07:35:50</span>
<script language="JavaScript" type="text/JavaScript" content="1">
   
   var dDateHead = new Date("15:02 3/27/2013");
   function showTimeLimit()
   {
       setTimeout("showTimeLimit()",1000);
       var dNowDay = new Date();
       iTimeLimit = dDateHead.getTime()-dNowDay.getTime();
       if(iTimeLimit>0){
               msSec = 1000;//一秒毫秒数  
           msMin = 60*msSec;//一分钟毫秒数
           msHour = 60*msMin;//一小时毫秒数
           msDay = 24*msHour;//一天的毫秒数

           iDay=Math.floor(iTimeLimit/msDay);
           iHour=Math.floor(iTimeLimit/msHour);
           iMin=Math.floor((iTimeLimit-iHour*msHour)/msMin);
           iSec=Math.floor((iTimeLimit-iHour*msHour-iMin*msMin)/msSec);
           iHour = iHour>=24?Math.floor(iHour%24):iHour;
           iHour = iHour<10&&iHour>0?"0"+iHour:iHour;
           iMin = iMin<10?"0"+iMin:iMin;
           iSec = iSec<10?"0"+iSec:iSec;
           document.getElementById("liTimeLimit").innerHTML=iDay+"<span class=\"witha\">天</span>"+iHour+":"+iMin+":"+iSec;
       }
       
   }
showTimeLimit();
</script>
</body>
</html>