function menu(menu_item) {
	
	if(document.getElementById('l2_'+menu_item)){
		if(document.getElementById('l2_'+menu_start_item)){
			document.getElementById('l2_'+menu_start_item).style.visibility = "hidden";
		}
		if(document.getElementById('l2_'+menu_active_item))
			document.getElementById('l2_'+menu_active_item).style.visibility = "hidden";
		document.getElementById('l2_'+menu_item).style.visibility = "visible";
		menu_active_item = menu_item;
	}
}

function menu_restore() {
	if(document.getElementById('l2_'+menu_active_item)){
		document.getElementById('l2_'+menu_active_item).style.visibility = "hidden";
	}
	if(document.getElementById('l2_'+menu_start_item)){
		document.getElementById('l2_'+menu_start_item).style.visibility = "visible";
	}
}