noweOkienko = null;

function pop(src){
if(noweOkienko==null || noweOkienko.closed){
 ustawienia=
 "left=175,"
 +"top=100,"
 +"width=720,"
 +"height=720,"
 +"toolbar=no,"
 +"location=no,"
 +"directories=no,"
 +"status=no"
 +"menubar=no,"
 +"scrollbars=no,"
 +"resizable=no"
 noweOkienko = window.open("okno.php?img="+src,'Zdjêcie',ustawienia);
}

noweOkienko.focus();
}