function openWin(url, name, width, height) {
// otevre okno zadanych rozmeru - zarovnane vlevo nahore
  popupWin = null;
  popupWin = window.open(url, name, 'width=' + width + ',height=' + height + ',top=0,left=0,scrollbars,resizable');
  // focus window (only for NN3.0)
  if ( (navigator.appName != "Microsoft Internet Explorer") && (navigator.appVersion.substring(0,1) == "3") ) {
    popupWin.focus();
  }
}