function TimeTip()
{   
    var day,hours,minutes,seconds;
    var objday,objHours,objMinutes,objSeconds;
    objday=document.getElementById("d");
    objHours=document.getElementById("h");
    objMinutes=document.getElementById("m");
    objSeconds=document.getElementById("s");
    
    day=parseInt(objday.innerHTML);
    hours=parseInt(objHours.innerHTML);
    minutes=parseInt(objMinutes.innerHTML);
    seconds=objSeconds.innerHTML;
    
    if(day==0&&hours==0&&minutes==0&&seconds==0)
    {
        return;
    }
    
    seconds=seconds-1;
    
    if(seconds<=0)
    {  seconds=59;
       minutes=minutes-1;      
       if(minutes<=0)
       { 
          minutes=59;
          hours=hours-1;         
          if(hours<=0)
          { 
            hours=23;
            day=day-1;
            if(day<=0)
            {
              return;
            }
          }
       }
     }
    
    
     objday.innerHTML=day;
     objHours.innerHTML=hours;
     objMinutes.innerHTML=minutes;
     objSeconds.innerHTML=seconds;
     
     window.setTimeout(TimeTip,1000);
}