function toggleVisibility(a) {
  document.getElementById(a).style.display = "";
  if(document.getElementById(a).style.visibility == "hidden" ) {
    document.getElementById(a).style.visibility = "visible";
  }
  else {
  document.getElementById(a).style.visibility = "hidden";
  }
}

function toggleDisplay(a) {
  document.getElementById(a).style.visibility = "visible";
  if(document.getElementById(a).style.display == "none" ) {
    document.getElementById(a).style.display = "";
  }
  else {
    document.getElementById(a).style.display = "none";
  }
}