function double_foreign_key_dtf_show_item(name, key)
{
	for (idx in document.getElementById('group_' + name).options)
	{
		item_el = document.getElementById('item_'+ name + '_' + idx);
		if (item_el !== null)
		{
			item_el.style.display = 'none';
		}
	}
	
	item_el = document.getElementById('group_'+ name + '_' + '0');
	if (item_el !== null)
	{
		item_el.style.display = 'none';
		if (key == 0 && key !== '')
		{
			item_el.style.display = 'block';
		}
	}
	
	item_el = document.getElementById('item_' + name + '_' + key);
	if (item_el !== null)
	{
		item_el.style.display = 'block';
	}
}