function popup (doc, w, h) {
  if (w == null) w = 500
  if (h == null) h = 400
  var floater = null
  window.name = "Kranjska Gora"
  floater = window.open (doc, '', 'width=' + w + ',height=' + h + ',menubar=yes,resizable=no,scrollbars=yes')
 
  if (floater != null) {
    if (floater.opener == null) {
      floater.opener = self
    }
    floater.location.href = doc
  }
}