function ouverture(id){
	fermeture();
	if(id!=''){
		element_cible=document.getElementById(id);
		if (element_cible.style.display == "block"){
			element_cible.style.display = "none";
		}else{
			element_cible.style.display = "block";
		}
	}
}

function fermeture(id){
	document.getElementById('menu_1_2').style.display = "none";
	document.getElementById('menu_2_2').style.display = "none";
}