this.oldmenu="false";
this.oldbouton="false";

function hideit(action,nom_layer) {
  if (document.layers) {
    // Netscape 4 stuff
    var cible = document.layers[nom_layer];
  } else if (document.getElementById) {
    // IE 5 and Netscape 6
    var cible = document.getElementById(nom_layer);
  } else if (document.all) {
    // IE 4 ??
    var cible = document.all(nom_layer);
  } else {
    alert("Problème avec votre navigateur");
  }
  if (cible.style)
  {
    // IE4 ??, IE5, Netscape 6
    if (action) { cible.style.visibility = "hidden"; }
	else { cible.style.visibility = "visible"; }
  }
  else {
    // Netscape 4
    if (action) { cible.visibility = "hide";}
	else { cible.visibility = "show"; }
  }
}
function montre(nomlayer)
{
hideit(false,nomlayer);
hideit(false,"zone1");
hideit(false,"zone2");
if (document.getElementById("formulaire")){hideit(true,"formulaire")};
this.oldmenu=nomlayer;
}
function cache(){
	hideit(true,"zone1");
	hideit(true,"zone2");
if (document.getElementById("formulaire")){hideit(false,"formulaire")};
	if(this.oldmenu!="false"){
		hideit(true,oldmenu);
		this.oldmenu="false";
	}
}