function findObject(n,d) {
  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=findObject(n,d.layers[i].document);
  if(!x && d.getElementById) 
	x=d.getElementById(n); 
  return x;
}
var last='';var lastdeux='';
function changeMenuVisibility(qui,deux){

	if(last!= '') {
	  div1=findObject(last);
		div1.style.visibility="hidden";
		last='';
	}	
  if(lastdeux!='') {
	  div1=findObject(lastdeux);
		div1.style.visibility="hidden";
		lastdeux='';
	}	
	
	if (deux){
		div2=findObject(deux);
	  div2.style.visibility="visible";
		lastdeux=deux;
	}
	if (qui) {
    div2=findObject(qui);
    div2.style.visibility="visible";
    last=qui;	
  }
}