function Cacher7() {
    document.getElementById("item-7").style.visibility="hidden";
  }
  function Montrer7() {
    document.getElementById("item-7").style.visibility="visible";
  }
  function Cacher6() {
    document.getElementById("item-6").style.visibility="hidden";
  }
  function Montrer6() {
    document.getElementById("item-6").style.visibility="visible";
  }
  function Cacher5() {
    document.getElementById("item-5").style.visibility="hidden";
  }
  function Montrer5() {
    document.getElementById("item-5").style.visibility="visible";
  }
  function Cacher4() {
    document.getElementById("item-4").style.visibility="hidden";
  }
  function Montrer4() {
    document.getElementById("item-4").style.visibility="visible";
  }
  function Cacher3() {
    document.getElementById("item-3").style.visibility="hidden";
  }
  function Montrer3() {
    document.getElementById("item-3").style.visibility="visible";
  }
  function Cacher2() {
    document.getElementById("item-2").style.visibility="hidden";
  }
  function Montrer2() {
    document.getElementById("item-2").style.visibility="visible";
  }
  function Cacher1() {
    document.getElementById("item-1").style.visibility="hidden";
  }
  function Montrer1() {
    document.getElementById("item-1").style.visibility="visible";
  }