function MenuItemMouseOver(subMenuId, menuImgId, menuItemImg)
{
    var _menuImg = document.getElementById(menuImgId);
    var _subMenu = document.getElementById(subMenuId);
    if (_subMenu != null)
    {
        _subMenu.style.display = 'block';
    }

    _menuImg.src = menuItemImg;
}

function MenuItemMouseOut(subMenuId, menuImgId, menuItemImg)
{
    var _menuImg = document.getElementById(menuImgId);
    var _subMenu = document.getElementById(subMenuId);

    if (_subMenu != null)
    {
        _subMenu.style.display = 'none';
    }

    _menuImg.src = menuItemImg;
}

function ChangeSubMenuClass(sender)
{
    if (sender.className == 'SubMenuItem')
    {
        sender.className = 'SubMenuItemHover';
    }
    else
    {
        sender.className = 'SubMenuItem';
    }
}