function calculateDifference(toDate)
{
   result="";
    now =new Date();
    delta = toDate - now ;
    days = String(parseInt(delta/86400000));
    hours = String(parseInt((delta - (days*86400000))/3600000));
    if(hours.length==1)
        hours="0" + hours;
    minutes = String(parseInt((delta - (days*86400000) - (hours*3600000))/60000));
    if(minutes.length==1)
        minutes="0" + minutes;
    seconds = String(parseInt((delta - (days*86400000) - (hours*3600000) - (minutes*60000) )/1000));
    if(seconds.length==1)
        seconds="0" + seconds;
    
    if(days>0)
        result += days + ":";
    else
        result += "0:";

    result+=hours + ":" + minutes + ":" + seconds;    
    return result;
  }