var tabs = ['poem_tab', 'mission_tab', 'values_tab'];
var subs = ['value1_sub', 'value2_sub', 'value3_sub', 'value4_sub'];
var values = ['value1', 'value2', 'value3', 'value4', 'poem', 'mission', 'links'];

function show(show) {
	// update tabs
	if(in_array(show + '_tab', tabs)) {
		//tab_name = (show == 'links') ? 'mission_tab' : show + '_tab';
		on_only(show + '_tab', tabs, 'tab');

		if(show == 'values') {
			show_abs(subs);
			show = 'value1';
		} else {
			hide_abs(subs);
		}
	}
	
	// update content area
	show_only(show, values);

	// update sub-menu
	if(in_array(show + '_sub', subs)) {
		on_only(show + '_sub', subs, 'sub');
	}
}