function showhide(id)
{
        list = document.getElementById('menu_' + id + '_list');
        link = document.getElementById('menu_' + id + '_link');
        if (!list)
                return false;
        if (!link)
                return false;
        if (list.style.display == 'none')
        {
                list.style.display = 'block';
                link.className = 'item_current';
        }
        else
        {
                list.style.display = 'none';
                link.className = '';
        }
}