//dropMenu.js

var isShowing = false;
var menuItem = null;

function showMenu(id)
{
    hideMenu();
    menuItem = document.getElementById(id);
    menuItem.style.visibility = 'visible';
    isShowing = true;
}

function hideMenu()
{       
    if (isShowing) menuItem.style.visibility = 'hidden';
    isShowing = false;
}