bezig met mijn eerste eigen scriptje

<?php
include ("config.php"); 

function selecteer(){ 
$select = "SELECT * FROM link_categorie ORDER BY naam ASC";
$obj = mysql_query($select) or die($MySQLError.mysql_error()); 
return $obj; } 

$res = selecteer(); 
while($row = mysql_fetch_object($res)) { 

echo "<a href='links.php?linkid=$row->id'>$row->naam</a><br>"; 

}
?>

<?php
include ("config.php"); 
 
function selecteer(){ 
$select = "SELECT * FROM link_categorie ORDER BY naam ASC";
$obj = mysql_query($select) or die($MySQLError.mysql_error()); 
return $obj; } 
 
$res = selecteer(); 
while($row = mysql_fetch_object($res)) { 
 
echo "<a href='links.php?linkid=$row->id'>$row->naam</a><br>"; 
 
}
?>

<?php
ob_start();  
include ('config.php'); 
$linkid=$_GET['id'];
$query=mysql_query("SELECT * FROM link_categorie where id='$linkid'") or die(mysql_error());   
$obj=mysql_fetch_object($query);  


$query = mysql_query("SELECT * FROM link_url ORDER BY naam ASC");    
  
while ($obj = mysql_fetch_object($query)) {  
$linkid = "$obj->id";  
?>

<b><?php echo"$obj->url"; ?></b><br>
<?php } ?>

<?php
ob_start();  
include ('config.php'); 
$linkid=$_GET['id'];
$query=mysql_query("SELECT * FROM link_categorie where id='$linkid'") or die(mysql_error());   
$obj=mysql_fetch_object($query);  
 
 
$query = mysql_query("SELECT * FROM link_url ORDER BY naam ASC");    
 
while ($obj = mysql_fetch_object($query)) {  
$linkid = "$obj->id";  
?>
 
<b><?php echo"$obj->url"; ?></b><br>
<?php } ?>

CREATE TABLE `link_categorie` (
  `id` mediumint(11) NOT NULL auto_increment,
  `naam` varchar(225) NOT NULL default '',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM; 

CREATE TABLE `link_url` (
  `id` mediumint(11) NOT NULL auto_increment,
  `naam` varchar(225) NOT NULL default '',
  `url` varchar(225) NOT NULL default '',
  `categorie` varchar(225) NOT NULL default '',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM; 

CREATE TABLE `link_categorie` (
  `id` mediumint(11) NOT NULL auto_increment,
  `naam` varchar(225) NOT NULL default '',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM; 
 
CREATE TABLE `link_url` (
  `id` mediumint(11) NOT NULL auto_increment,
  `naam` varchar(225) NOT NULL default '',
  `url` varchar(225) NOT NULL default '',
  `categorie` varchar(225) NOT NULL default '',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM;