public function getUrl( $email ){
		$hash	= md5( strtolower( trim( $email ) ) );
		$query	= array(
			's'	=> $this->size,
			'd'	=> $this->default,
			'r'	=> $this->rate,
		);
		return $this->url.$hash.'?'.http_build_query( $query, NULL, '&amp;' );
	}