Select PHP

?>
<select name="names">
<?php
$query = mysql_query("select username from users order by user_id ASC");

if(mysql_num_rows($query) >0){
	//output data
	while ($row = mysql_fetch_assoc($query)){
		echo "<option name=\"". $row['username']. "\">" . $row['username'] . "<option/>";
	}
}
else{
	echo "error";
}
?>
</select>