function hideSubMenu()
{
    var subNav = document.getElementById('SubNav');
    subNav.style.visibility = 'hidden';
}

function showSubMenu()
{
    var subNav = document.getElementById('SubNav');
    subNav.style.visibility = 'visible';
}

function hideSubMenu2()
{
    var subNav = document.getElementById('SubNav2');
    subNav.style.visibility = 'hidden';
}

function showSubMenu2()
{
    var subNav = document.getElementById('SubNav2');
    subNav.style.visibility = 'visible';
}