function visElement(objekt) {
  if (document.getElementById(objekt).style.
    visibility=="visible") {
    document.getElementById(objekt).style.
      visibility="hidden";
  }
  else {
    document.getElementById(objekt).style.
      visibility="visible";  
  }
}

function skjulElement(objekt) {
  if (document.getElementById(objekt).style.
  visibility=="hidden") {
    document.getElementById(objekt).style.
    visibility="visible";
  }
  else {
    document.getElementById(objekt).style.
    visibility="hidden";  
  }
}