Phproblems i mysql errors

Phproblems i mysql errors

When doing this i got error: "Warning: mysql_result() expects parameter 1
to be resource, boolean given in /home/chatvik/public_html/index.php on
line 17" i cant find any problems. Please help me
Row 11-18
sql = "SELECT id FROM users
WHERE user='{$_POST['user']}'
AND pass='{$_POST['passwd']}'";
$result = mysql_query($sql);
// Sätt sessionen med unikt index
$_SESSION['sess_id'] = mysql_result($result, 1);
$_SESSION['sess_user'] = $_POST['user'];
The meaning is that if there is only 1 row do...