Ragazzi mi sapete dire come mai quando carico questa pagina, non dà alcun errore ma semplicemente pagina bianca:

Codice PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento senza titolo</title>
<style type="text/css">
#font_style_table { font-family: Arial, Helvetica, sans-serif; font-size: 12px; }
#footer { background-color: #F2F2F2; font-size: 11px; }
ul { list-style: none; margin: 0; padding: 0; }
li { float: left; margin:3px; border: 1px solid #CCC; padding: 3px; }
.content { padding: 5px; line-height: 25px; }

/* General style */
.green { color: #090; }
.blue { color: #09F; }
</style>
</head>

<body>
<div align="center">
<table width="827" border="1" id="font_style_table">
  <tr>
    <td>[img]../img/logohustler.png[/img]</td>
    <td><div align="right">Benvenuto: [b]<span class="green"><?php echo $row['login']; ?></span>[/b] - <?php echo date ( "F j, Y, g: ia " ); ?> [/b][url="logout.php"][ logout ][/url]</div></td>
  </tr>
  <tr>
    <td colspan="2">[b]PANNELLO DI AMMINISTRAZIONE &gt; Gestisci releases[/b]</td>
    </tr>
  <tr>
    <td colspan="2">
        <ul>
            [*][b]MENU[/b]
            [*][url="panel.php"]Home panel[/url][*][url="gestisci_releases.php"]releases e news[/url]
            <li class="blue">[b]supporters[/b][*][url="gestisci_bio.php"]Artists & Remixer[/url][/list]</td>
    </tr>
  <tr>
    <td colspan="2">
    <div class="content">
    
          <form ENCTYPE="multipart/form-data" action="upload_sup.php" method="POST">
                  
                

[b]IMMAGINI[/b]

                  Carica immagine del supporter:

                    <input type="file" name="image" id="image">

                    <input type="submit" value="Carica supporter" />
                    <input name="upImage" type="hidden" value="" />
                </p>
            
          </form>
          

[b]IMMAGINI:[/b]</p>
          <ul>
                <?php
                
                // Creo una variabile dove imposto il numero di record 
                // da mostrare in ogni pagina
                $x_pag = 10;
                
                // Recupero il numero di pagina corrente.
                // Generalmente si utilizza una querystring
                $pag = $_GET['pag'];
                
                // Controllo se $pag è valorizzato...
                // ...in caso contrario gli assegno valore 1
                if (!$pag) $pag = 1;
                
                // Uso mysql_num_rows per contare le righe presenti
                // all'interno della tabella agenda
                $all_rows = mysql_num_rows(mysql_query("SELECT * FROM supporter_image"));
                
                // Tramite una semplice operazione matematica definisco
                // il numero totale di pagine
                $all_pages = ceil($all_rows / $x_pag);
                
                // Calcolo da quale record iniziare
                $first = ($pag - 1) * $x_pag;
                
                $qry = "SELECT * FROM supporter_image ORDER BY id_image DESC, data DESC LIMIT $first, $x_pag";
                          
                $rs = mysql_query($qry) or die ('Errore query: ' . mysql_error());
                $nr = mysql_num_rows($rs);
              
                if ($nr != 0)
                {
                
                /*function StringFormat($string, $a, $b)
                {
                    $string = substr(ucfirst(strtolower($string)), $a, $b);
                    return $string;
                }*/
                
                    for($x = 0; $x < $nr; $x++)
                    {
                        $row = mysql_fetch_assoc($rs);    
                        echo "[*]";
                        echo "IMG: <img src=\"../img/supporters/images/thumb/".$row['url']."\" />
"
                        echo "DATA: ".$row['data']."
";
                        echo "CANCELLA: <input type=\"checkbox\" id=\"supp_img\" name=\"delete[]\" value=".$row['id_image']." />";
                        echo "MODIFICA: <a href=\"modifica_supp_image.php?id_img=".$row['id_image']."\">Modifica</a>";            
                        echo "";
                    }

                }
                                               
                ?>[/list]
        </div>
        </td>
  </tr>
  </table>
  </div>
          
 </body>
</html>
Cosa sbaglio?

Grazie anticipatamente.