var element;

   function ShowClock(id_element) {
      var Digital=new Date();
      element = id_element;
      var dzien=Digital.getDate();
      var rok=Digital.getYear();
      var miesiac = Digital.getMonth()+1; 
      var hours=Digital.getUTCHours()-Digital.getTimezoneOffset()/60;
      hours=(hours>=24?hours-24:hours);
      var minutes=Digital.getMinutes();
      var seconds=Digital.getSeconds();
      var dn=' ' +rok+'-'+(miesiac>9 ?'':0)+miesiac+'-'+(dzien>9 ?'':0)+dzien+' '+(hours>9 ?'':0)+hours+':'+(minutes>9 ?'':0)+minutes+':'+(seconds>9 ?'':0)+seconds;
      
      document.getElementById(element).innerText=dn;
      
      setTimeout("ShowClock(element)",1000);
    }