PHP : variable qui ne se transmet pas

Bonjour,

Alors petit probleme : j'ai un variable qui est envoyé à la page employant une fonction qui fait un include (qui fonctionne parfaitement) d'une autre dont voici le code :

<?php
$connect2 = mysql_connect("localhost", "NES", "grobeta");
mysql_select_db("CMS_NES-Tech");
echo $_GET['theme_del'];

if (isset($_POST['addtheme'])){

add_theme($_POST['theme_name_field'], $_POST['theme_path_field']);
}

if (isset($_GET['theme_act'])){

$query_act = "SELECT theme_num FROM affichage WHERE statut = 1";
$res_act = mysql_query($query_act);

if (mysql_num_rows($res_act) != 0){

$query_deact_update = "UPDATE affichage SET statut = 0 WHERE affichage.statut = 1";
mysql_query($query_deact_update);
$query_act_update = "UPDATE affichage SET statut = 1 WHERE theme_num=".$_GET['theme_act'];
mysql_query($query_act_update);
}else{

$query_act_update = "UPDATE affichage SET statut = 1 WHERE theme_num=".$_GET['theme_act'];
mysql_query($query_act_update);
}
}

if (isset($_GET['theme_del'])){

delete_theme($_GET['theme_del']);
}


$query_actuMod_num = "SELECT module_num FROM modules WHERE module_name = '".$_GET['page']."'";
$resModNum = mysql_query($query_actuMod_num);
$modNum = mysql_fetch_array($resModNum);
mysql_close($connect2);

?>
<div align = 'left'>

<div align = 'center'>
<form action = "admin.php" method = "post" align = 'center'>
<table align = 'center'>
<tr>
<td>Nom du theme</td>
<td> <input type="textfield" accesskey="20" name="theme_name_field" /> </td>
</tr>
<tr>
<td>Chemin vers le dossier du theme </td>
<td> <input type="textfield" accesskey="20" name="theme_path_field" /> </td>
</tr>
<tr align = 'center'>
<td><input type="submit" name="addtheme" value="Ajouter"></td>
</tr>
</table>
</form>
</div>

</div>

<?php

$connex = mysql_connect("localhost","NES","grobeta");
mysql_select_db("CMS_NES-Tech");
$query_affichage = "SELECT theme_num, theme_name, theme_path FROM affichage";
$res_affichage = mysql_query($query_affichage);
mysql_close($connex);

if (mysql_num_rows($res_affichage) != 0){
?>
<div>
<table border = 1 align = 'center' width = 80%>
<tr>
<th>Numéro de theme</th>
<th>Nom de theme</th>
<th>Chemin vers le dossier du theme</th>
<th>Statut</th>
<th>Activation / Suppression</th>
</tr>
<?php

while ($array_res = mysql_fetch_array($res_affichage)) { ?>
<tr>
<td>
<?php echo $array_res['0']; ?>
</td>

<td>
<?php echo $array_res['1']; ?>
</td>

<td>
<?php echo $array_res['2']; ?>
</td>

<td>
<?php is_active($array_res['0']) ?>
</td>

<td>
<table align = 'center'>
<tr>
<td width = 50% align='center'>
<?php
echo $array_res['0']."<br />";
echo "<a href='admin.php?theme_act='". $array_res['0'] ."<img src='images/ok.png' title='ok' height='30' width='30'></a>"; ?>
</td>
<td width = 50% align='center'>
<?php echo "<a href='admin.php?theme_del='". $array_res['0'] ."<img src='images/trashempty.png' title='trashempty' height='30' width='30'></a>"; ?>
</td>
</tr>
</table>
</td>
</tr>
<?php
}

?>
</div>
<?php
}else{

echo "Aucun theme enregistré";

}

function theme_php_path ($path){

$proper_theme_path = "";
$theme_path = explode("\\",$path);
$i = 0;
while($array_path = $theme_path){
$proper_theme_path.$array_path[$i]."/";
$i++;
}
return $proper_theme_path;
}

function add_theme ($name, $path){

$connex2 = mysql_connect("localhost","NES","grobeta");
mysql_select_db("CMS_NES-Tech");
$query_insert = "INSERT INTO affichage ('theme_num', 'theme_name', 'theme_path', 'statut')VALUES (NULL , '".$name."', '".theme_php_path($path)."', 0)";
$res_insert = mysql_query($query_insert);
mysql_close($connex2);
}

function is_active ($id){

$connex3 = mysql_connect("localhost","NES","grobeta");
mysql_select_db("CMS_NES-Tech");
$query_is_active = "SELECT statut FROM affichage WHERE theme_num = ".$id;
$res_is_active = mysql_query($query_is_active);
$array_is_active = mysql_fetch_array($res_is_active);
mysql_close($connex3);

if ($array_is_active['0'] == 1){

echo "Active";
}else{

echo "Desactive";
}
}

function delete_theme ($id){

echo $id;
$connex4 = mysql_connect("localhost","NES","grobeta");
mysql_select_db("CMS_NES-Tech");
$query_delete = "DELETE FROM affichage WHERE theme_num = ".$id;
echo $query_delete;
$res_delete = mysql_query($query_delete);
$array_delete = mysql_fetch_array($res_delete);
mysql_close($connex4);
}
?>

Cette page de mon CMS me sert à administrer l'affichage sur mon site, le problème étant que les variables de la sections en gras ne passent pas, theme_del et theme_act restent vide. Les parties en traitant sont en gras dans le code.
Les fonctions sont correctes, je les ai déjà vérifiées c'est uniquement un problème de transmission des variables.

Merci