function switchlang() {
  if (document.getElementById('text_it').style.display != "none") {
    document.getElementById('text_it').style.display = "none"
    document.getElementById('text_orig').style.display = "block"
    document.getElementById('txtoriginal').style.display = "none"
    document.getElementById('txtitalian').style.display = "block"
  }
  else {
    document.getElementById('text_it').style.display = "block"
    document.getElementById('text_orig').style.display = "none"
    document.getElementById('txtoriginal').style.display = "block"
    document.getElementById('txtitalian').style.display = "none"
  }
}