function OpenMapaWindow(url, jmeno, w, h) 
{
    xc=(screen.width / 2) - (w/2);
    yc=(screen.height / 2) - (h/2);
    Fokus = window.open(url, jmeno,'resizable=0,top=' +yc+ ',left=' + xc + ',menubar=0,scrollbar="1",width=' + w + ',height=' + h);
  Fokus.focus()
}