function openWindowSize(url,w,h) {
  iMyWidth = (window.screen.width/2) - ((w/2) + 10);
  iMyHeight = (window.screen.height/2) - ((h/2) + 25);
  Fokus = window.open(url,"nove_okno",'resizable=1,top=' + iMyHeight + ',left=' + iMyWidth + ',scrollbars=1,menubar=0,width=' + w + ',height=' + h);
  if (Fokus.opener == null) Fokus.opener = self;
  Fokus.focus();
  }