function kisablak(w, h, url, x) {

  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;

  if (x == 1) { scrl = "yes" };
  if (x == 0) { scrl = "no" };

  akarmi = window.open(url, 0, 'width=' + w + ', height=' + h + ', top=' + wint + ', left=' + winl + ', scrollbars=1' + scrl + ', scroll=1, resizeable=0');
  
  if (parseInt(navigator.appVersion) >= 4) { akarmi.window.focus(); }
}