please modify my php code(10 pts)?

[Creq Du Freak]

<?php

session_start();
include 'connect.php';


$query = 'SELECT * FROM m_user_acc WHERE uid = "' . $_SESSION['id'] . '" LIMIT 1';
$userResult = mysql_query($query);
if(mysql_num_rows($userResult) == 1)
{
$_SESSION['user'] = mysql_fetch_assoc($userResult);
}

echo $_SESSION['uname'];

?>



i want to use tihs code under if(isset($_SESSION['id'])){}

i want to execute the code only if the session is already set