function showSubNav(listId)
{
    var list = document.getElementById(listId);
    if (list != null)
    {
        if (hasClass(list,"niveau2NoDisplay"))
        {
            list.className = " niveau2";
            list.style.display = "block";
        }
        else
        {
            list.className = " niveau2NoDisplay";
            list.style.display = "none";
        }
    }
}