function montreSelectChantier (id)
{
 	
	if(document.getElementById(id))
 		document.getElementById(id).style.visibility="visible";
} 

function cacheSelectChantier (id)
{
 	
	if(document.getElementById(id))
 		document.getElementById(id).style.visibility="hidden";
} 
var pre_nav_id = 0;
function hideSubMenu( id )
{
	if(document.getElementById(id))
 		document.getElementById(id).style.visibility="hidden";
}
function showSubMenu( id )
{
	
 	if( pre_nav_id != 0 && pre_nav_id!= id ){
 		if(document.getElementById(pre_nav_id))
 			document.getElementById(pre_nav_id).style.visibility="hidden";
 	}
	
 	pre_nav_id = id;
 	
	if(document.getElementById(id))
 		document.getElementById(id).style.visibility="visible";
 		
	return;
}