Fejl i PHP

Fortsat debat fra: http://www.eksperten.dk/spm/346489

Har nu dette problem:

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /web/www/frac/users/webguy/Chattower/inc/header.php on line 66



Hentet fra inc/header.php:

<?
$select_new5 = mysql_query("SELECT username FROM users ORDER BY id DESC LIMIT 5");
while($row_new5 = mysql_fetch_array($select_new5)) { <-- Linje 66
print "$row_new5[username]<br>";
}
?>