function showFYTO(){
  document.getElementById("map_elev").style.visibility="hidden";
  document.getElementById("but_elev").style.display="none";
  document.getElementById("map_fyto").style.visibility="visible";
  document.getElementById("but_fyto").style.display="block";
}

function hideFYTO(){
  document.getElementById("map_elev").style.visibility="visible";
  document.getElementById("but_elev").style.display="block";
  document.getElementById("map_fyto").style.visibility="hidden";
  document.getElementById("but_fyto").style.display="none";
}

function showLIST(){
  document.getElementById("lst_quad").style.display="block";
  document.getElementById("but_lst1").style.display="none";
  document.getElementById("but_lst2").style.display="block";
}

function hideLIST(){
  document.getElementById("lst_quad").style.display="none";
  document.getElementById("but_lst1").style.display="block";
  document.getElementById("but_lst2").style.display="none";
}