function Ora(targetDate) {
  var time = new Date();
  var time2 = new Date(targetDate);
  var weeks = Math.floor((time2.getTime() - time.getTime())/(1000*60*60*24*7));
  var days = Math.floor((time2.getTime() - time.getTime())/(1000*60*60*24))%7;
  var hours = Math.floor((time2.getTime() - time.getTime())/(1000*60*60))%24;
  var mins = Math.floor((time2.getTime() - time.getTime())/(1000*60))%60;
  var secs = Math.floor((time2.getTime() - time.getTime())/(1000))%60;
  var temp = "";

  temp += weeks+" hét ";
  if( temp == "0 hét ")
    temp  = "";
  temp += days+" nap ";
  if( temp == "0 nap ")
    temp  = "";
  temp += hours;
  temp += ((mins < 10) ? ":0" : ":") + mins;
  temp += ((secs < 10) ? ":0" : ":") + secs;

  var a=document.getElementById("ora").innerHTML=temp;
  setTimeout("Ora('"+targetDate+"')",1000);
}