var vis = new Array();
var lastvis = 1 ;
vis[1]='show';

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function swap_couche(couche) {
   if (!(layer = MM_findObj('Layer' + couche))) return;
   if (!(menu = MM_findObj('menu' + couche))) return;
   if( typeof(vis[couche])=='undefined' ) vis[couche]='hide';
   if (vis[couche] == 'hide'){
      layer.style.display = 'block';
      vis[couche] = 'show';
		menu.className='selected';
		fermer_couche(lastvis);
      lastvis=couche ;
   }

}
function ouvrir_couche(couche) {
   if (!(layer = MM_findObj('Layer' + couche))) return;
   layer.style.display = 'block';
   vis[couche] = 'show';
}
function fermer_couche(couche) {
   if (!(layer = MM_findObj('Layer' + couche))) return;
   if (!(menu = MM_findObj('menu' + couche))) return;
   layer.style.display = 'none';
	menu.className='';
   vis[couche] = 'hide';
}