public function accordion($items = array(), $options = array()) {
		$defaults = array(
			'class' => '', 'id' => str_replace('.', '', uniqid('accordion_', true)),
		);
		$options = Hash::merge($defaults, $options);
		$options = $this->addClass($options, 'panel-group');

		if (is_array($items)) {
			$html = '';
			foreach ($items as $itemHeading => $itemBody) {
				$html .= $this->accordionItem($itemHeading, $itemBody, array('accordionId' => $options['id']));
			}
		} else {
			$html= $items;
		}

		return $this->tag('div', $html, $options);
	}