How to list forum categories on a non-vb page

[Raptor]

I saw this on another post (made for v1.1.5)

<?php
require("forum/admin/config.php3");
$db=mysql_connect($servername,$dbusername,$dbpassw ord);
mysql_select_db($dbname);
$query = "SELECT * FROM CATEGORY ORDER BY title ASC";
$resultlatest = mysql_query($query,$db);
while ($latest_array = mysql_fetch_array($resultlatest)) {
echo "<FONT SIZE=\"1\" FACE=\"Verdana\"> °
<A HREF=\"http://digital-forums.com/forum/index.php3?categoryid=$latest_array[categoryid]\">$latest_array[title]</A></FONT><BR>";
}

?>

But I just get this error msg:
Warning: Supplied argument is not a valid MySQL result resource in /home/dforums/public_html/list_categories.php3 on line 7

I'm using v2 beta 5 - can someone please get this working for me

thanks in advance !