Vulnerable SQLi

<?
/*
CREATE TABLE `member` (
  `id` int(11) NOT NULL,
  `user` varchar(20) NOT NULL,
  `pass` varchar(20) NOT NULL,
  `email` varchar(20) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `member`
--

INSERT INTO `member` VALUES(1, 'admin', 'wtf_1_g0t_h4ck', '[email protected]');
*/
mysql_connect("localhost","root","password");
mysql_select_db("test");
$id = $_GET["id"];
$result = mysql_query("select user from member where id=$id");
if($row = mysql_fetch_assoc($result)) echo $row["user"];
?>