var nn = null;
document.onclick=hidemenu;

function showmenu(n,nn)
{

hidemenu();

var menu = document.getElementById("menu_"+n);

menu.style.visibility="visible";

if(nn != 0) {
	var submenu = document.getElementById("menu_"+nn);
	submenu.style.visibility="visible";
	//alert('submenu.style.visibility');
}

}

function hidemenu()
{

var menuone = document.getElementById('menu_1');
var menutwo = document.getElementById('menu_2');
var menuthree = document.getElementById('menu_3');
var menufour = document.getElementById('menu_4');
var menufive = document.getElementById('menu_5');
var menusix = document.getElementById('menu_6');
var menuseven = document.getElementById('menu_7');

menuone.style.visibility="hidden";
menutwo.style.visibility="hidden";
menuthree.style.visibility="hidden";
menufour.style.visibility="hidden";
menufive.style.visibility="hidden";
menusix.style.visibility="hidden";
menuseven.style.visibility="hidden";

}

function showsubmenu()
{

var menu = document.getElementById("menu_14");

menu.style.visibility="visible";

}