function toggle_subcat_navi(act_id, min_id, max_id) {
	for (i = min_id; i <= max_id; i++) {
		div = document.getElementById('subcat_navi_' + i);
		if (div != null) {
			if (i == act_id) {
				div.style.display = 'block';
			}
			else {
				div.style.display = 'none';
			}
		}
	}
}