function prova(){
  myLightWindow.activateWindow({
    href: 'prova.html'
  });
}

function provaeng(){
  myLightWindow.activateWindow({
    href: 'provaeng.html'
  });
}

function provaesp(){
  myLightWindow.activateWindow({
    href: 'provaesp.html'
  });
}