function zegar()
{ 
 today = new Date();
// BigDay = new Date(t);
 BigDay = new Date(y, m, d, h, u);
 msPerDay = 24 * 60 * 60 * 1000 ;
 timeLeft = (BigDay.getTime() - today.getTime());
 e_daysLeft = timeLeft / msPerDay;
 daysLeft = Math.floor(e_daysLeft);
 tdays = Math.floor(e_daysLeft);
 e_hrsLeft = (e_daysLeft - daysLeft)*24;
 hrsLeft = Math.floor(e_hrsLeft);
 minsLeft = Math.floor((e_hrsLeft - hrsLeft)*60);
 secLeft = Math.floor(timeLeft / 1000 % 60);
 
 if(timeLeft > 0)
 document.getElementById('czasdata').innerHTML="Do następnej rundy: " + 
   daysLeft+"D "+hrsLeft+"H "+minsLeft+"M "+secLeft+"S" + "";
 else 
  document.getElementById('czasdata').innerHTML="Do następnej rundy: " + 
   "wystarował!";
  setTimeout('zegar()',1000);
}