function okno(cesta, sirka, vyska, pozadi){
  var vlevo = 10
  var nahore  = 10
  var newokno = window.open(cesta,'','toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=' + sirka + ',height=' + vyska + ',top=' + nahore + ',left=' + vlevo );
  newokno.focus();
}