function catalogues()
{
$statement = 'SELECT name FROM catalogue ORDER BY name';
$rs = mysql_query($statement, $this->db);
$result = array();
while ($row = mysql_fetch_array($rs, MYSQL_NUM)) {
$details = explode('.', $row[0]);
if (!isset($details[1])) {
$details[1] = null;
}
$result[] = $details;
}
return $result;
}