var layer_courant ;

//------------------------------------------
function montrer_layer(l)
{
if(!l)
	return;
	
if(document.all)
	l.style.visibility = "visible";
else
	l.visibility = "show";
}	

//------------------------------------------
function cacher_layer(l)
{
if(!l)
	return;
	
if(document.all)
	l.style.visibility = "hidden";
else
	l.visibility = "hidden";
}	

//------------------------------------------
function popUp(menuName,on)
{
var mon_layer;

if(document.all)
	mon_layer = document.all[menuName];
else	                             
	mon_layer = document.layers[menuName];

cacher_layer(layer_courant);
layer_courant = mon_layer ;
	
if(!mon_layer)
	return;	
          
if (on)
		montrer_layer(mon_layer);
                        
else
		cacher_layer(mon_layer);
}


// -->