static void
action_up_callback (GtkAction *action, 
		     gpointer user_data) 
{
	nautilus_window_go_up (NAUTILUS_WINDOW (user_data), FALSE, should_open_in_new_tab ());
}
static void
action_up_callback (GtkAction *action,
                    gpointer user_data)
{
    nautilus_window_go_up (NAUTILUS_WINDOW (user_data), FALSE);
}