private function updateImageInfo($width, $height) {
		$this->_image_info[0] = $width;
		$this->_image_info[1] = $height;
		$this->_image_info[3] = 'width="' . $width . '" height="' . $height . '"';
		$this->_image_info['aspect'] = $width / $height;
	}