public static function countSectionMediaElements($key = null) {
		if(!is_null($key)) {
			return count(self::$_sectionMedia[$key]);
		} else {
			$cImages = count(self::$_sectionMedia['images']);
			$cObjects = count(self::$_sectionMedia['embeddings']);
			$cLinks = count(self::$_sectionMedia['links']);
			return ($cImages + $cObjects + $cLinks);
		}
	}