public static function getSectionMediaElements($key = null) {
		if(!is_null($key)) {
			return self::$_sectionMedia[$key];
		} else {
			$arrImages = self::$_sectionMedia['images'];
			$arrObjects = self::$_sectionMedia['embeddings'];
			$arrLinks = self::$_sectionMedia['links'];
			return array_merge($arrImages, $arrObjects, $arrLinks);
		}
	}