<style>

#clock1{
    font-size: 12px;
    font-family:"Arial Black", Gadget, sans-serif;
    text-align:center;}

</style>
    <div id="clock1">[clock1]</div>

<script language="JavaScript">

   StartCountDown("clock1","17/03/2013 :00 AM -0400")
    
    
    
    
   function StartCountDown(myDiv,myTargetDate)
   {
     var dthen   = new Date(myTargetDate);
     var dnow   = new Date();
     ddiff      = new Date(dthen-dnow);
     gsecs      = Math.floor(ddiff.valueOf()/1000);
     CountBack(myDiv,gsecs);
   }
    
   function Calcage(secs, num1, num2)
   {
     s = ((Math.floor(secs/num1))%num2).toString();
     if (s.length < 2)
     {    
       s = "0" + s;
     }
     return (s);
   }
    
   function CountBack(myDiv, secs)
   {
     var DisplayStr;
     var DisplayFormat = "Дней %%D%% : Часов %%H%% : Минут %%M%% : Секунд %%S%%";
     DisplayStr = DisplayFormat.replace(/%%D%%/g,   Calcage(secs,86400,100000));
     DisplayStr = DisplayStr.replace(/%%H%%/g,      Calcage(secs,3600,24));
     DisplayStr = DisplayStr.replace(/%%M%%/g,      Calcage(secs,60,60));
     DisplayStr = DisplayStr.replace(/%%S%%/g,      Calcage(secs,1,60));
     if(secs > 0)
     {    
       document.getElementById(myDiv).innerHTML = DisplayStr;
       setTimeout("CountBack('" + myDiv + "'," + (secs-1) + ");", 990);
     }
     else
     {
       document.getElementById(myDiv).innerHTML = "Предложение завершено";
     }
   }

</script>