public function fetch_assoc($query = false) {
        $this->res_type($query);
	 if($query and !is_bool($query)) { 
  		return mysql_fetch_assoc($query); 
	 } 
 }

But my PHP isn't very good so if Nicolas could confirm that this isn't going to bork anything

But not everything is correct.
This error has not been solved.

notice
/var/www/html/fop2/lib/dblib.php (line 233)

mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource

dblib.php

/**
 * Fetch results by associative array
 *
 * @param mixed $query Select query or database result
 * @return array Row
 */
public function fetch_assoc($query = false) {
    $this->res_type($query);
    return mysql_fetch_assoc($query);  <<<<<<<<----------LINE 233
}

mysql -u root -proot
use fop2;

copy all and paste to console screen

CREATE TABLE `visual_phonebook` (
  `id` int(11) NOT NULL auto_increment,
  `firstname` varchar(50) default NULL,
  `lastname` varchar(50) default NULL,
  `company` varchar(100) default NULL,
  `phone1` varchar(25) default NULL,
  `phone2` varchar(25) default NULL,
  `picture` varchar(100) default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM;

and then

show columns from visual_phonebook;
+-----------+--------------+------+-----+---------+----------------+
| Field     | Type         | Null | Key | Default | Extra          |
+-----------+--------------+------+-----+---------+----------------+
| id        | int(11)      | NO   | PRI | NULL    | auto_increment |
| firstname | varchar(50)  | YES  |     | NULL    |                |
| lastname  | varchar(50)  | YES  |     | NULL    |                |
| company   | varchar(100) | YES  |     | NULL    |                |
| phone1    | varchar(25)  | YES  |     | NULL    |                |
| phone2    | varchar(25)  | YES  |     | NULL    |                |
| picture   | varchar(100) | YES  |     | NULL    |                |
+-----------+--------------+------+-----+---------+----------------+
7 rows in set (0.00 sec)

for testing

insert into visual_phonebook(firstname, lastname, phone1) values('john', 'doe', '0141123456');
select * from visual_phonebook;
+----+-----------+----------+---------+------------+--------+---------+
| id | firstname | lastname | company | phone1     | phone2 | picture |
+----+-----------+----------+---------+------------+--------+---------+
|  1 | john      | doe      | NULL    | 0141123456 | NULL   | NULL    |
+----+-----------+----------+---------+------------+--------+---------+
1 row in set (0.00 sec)

mysql> use fop2;
Database changed
mysql> select * from visual_phonebook;
ERROR 1146 (42S02):Table 'fop2.visual_phonebook' doesn´t exist

2)edit config.php

notice
/var/www/html/fop2/lib/dblib.php (line 233)

mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource
notice
/var/www/html/fop2/lib/dblib.php (line 233)

mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource

An error has occurred

Unknown field: picture
notice
/var/www/html/fop2/lib/dblib.php (line 344)

mysql_num_fields(): supplied argument is not a valid MySQL result resource
notice
/var/www/html/fop2/lib/dblib.php (line 333)

mysql_num_rows(): supplied argument is not a valid MySQL result resource

No records found
notice
/var/www/html/fop2/lib/dblib.php (line 244)

mysql_fetch_row(): supplied argument is not a valid MySQL result resource

use fop2;
select * from visual_phonebook;

do you see the picture column?

also goto

/var/www/html/fop2/

edit config.php

Change

define('DEBUG',false);

to

define('DEBUG',true);

save and upload, goto http://YOUR_SERVER_IP/fop2/phonebook.php
and paste the output here