function ShowSubMenu(subMenu)
{
    var divSubMenu = document.getElementById("s" + subMenu);
    if (divSubMenu != null)
    {
        divSubMenu.style.display = 'block';
        divSubMenu.style.visibility = 'visible';
    }        
        
}
function HideSubMenu(subMenu)
{
    var divSubMenu = document.getElementById("s" + subMenu);
    if (divSubMenu != null)
    {
        divSubMenu.style.display = 'none';
        divSubMenu.style.visibility = 'hidden';
    }        
        
}