function Menu(menuid) {

	var menuitem = document.getElementById(menuid);
	
	for (i=1;i<=23;i++){
		if(i!=menuid)document.getElementById(i).style.display = "none";
	}
	if(menuitem.style.display=="none"){
		menuitem.style.display = "block";
	}else{
		menuitem.style.display = "none";
	}
}