function ouvrirMenu(principal, ident) {
	// menu principal actif
	var menus = principal.parentNode.parentNode.getElementsByTagName("A");
	for (var i = 0; i < menus.length; i++) {
		if (menus[i].className == "actif") { menus[i].className = ""; }
	}
	principal.className = "actif";
	// sous-menu actif
	var ssmenus = document.getElementById("listMenuRoot").getElementsByTagName("UL");
	for (var i = 0;i<ssmenus.length;i++) {
		ssmenus[i].style.display = 'none';
	}
	var ssmenu = document.getElementById("sousmenu"+ident);
	if (ssmenu) { ssmenu.style.display = 'block'; }
}