function showHideItem( id ) {
   if(document.getElementById(id).style.display=='none') {
      document.getElementById(id).style.display='block';
   } 
   else
   {
      document.getElementById(id).style.display='none';
   }
}

function nowe(adres, rozmiarX, rozmiarY) {
   n_ok = window.open(adres,'okienko','scrollbars=no, status=no, toolbar=no, location=no, directories=no, width='+rozmiarX+', height='+rozmiarY+'');
   if (window.blur) { n_ok.focus(); }
}