ch_toggle_subcat = false;
function toggle_subcat (obj) { 
	if (ch_toggle_subcat) {
		$(obj).removeClassName('c-subcat-open');
		$(obj).addClassName('c-subcat-closed'); 
		ch_toggle_subcat = false;
	} else {
		$(obj).removeClassName('c-subcat-closed'); 
		$(obj).addClassName('c-subcat-open'); 
		ch_toggle_subcat = true;
	}
	$('id_subcat_table').toggle(); 
}