prova così

Codice PHP:
<? 
include("../php/funzioni.php");     

$sql="SELECT * FROM dw_setting"; 
$result=mysql_query($sql) or die(mysql_error()); 
while($a = mysql_fetch_array($result)){ 
    $titolo =$a['titolo']; 
} 

$user = mysql_real_escape_string($_POST['user']); 
$pass = mysql_real_escape_string($_POST['pass']); 
?>

<!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>CMS - Decadeweb.it</title> 
<link rel="stylesheet" type="text/css" href="../css/style.css" /> 
<script type="text/javascript" src="../js/function.js"></script> 
<?php
$sql="SELECT count(*) as tot,visibile FROM dw_utenti WHERE username = '$user' AND password = '$pass' "; 
$result = mysql_query($sql) or die(mysql_error()); 
while($row = mysql_fetch_array($result)){ 
         $utente = $row['tot']; 
        $visibile = $row['visibile']; 
        if($utente == 0){ 
            setcookie("Decade", "", time()-9999); 
            sleep(5); 
            ?> 
                <script language="javascript" type="text/javascript"> 
                var proprioUrl = 'http://'+window.document.domain; 
                alert("Controllare i dati inseriti"); 
                document.location.href = proprioUrl+"/dw-admin/index.php";         
                    </script> 
               <? 
        }else{ 
            if($visibile=='Si'){ 
                $_SESSION['user']= $user; 
                $_SESSION['pass']= $pass; 
                $contenuto= $_POST['user']; 
                setcookie("Decade", $contenuto ,time() + 604800); // L'errore viene segnalato a questa riga!!! 
                 
            }else{ 
                ?> 
                <script language="javascript" type="text/javascript"> 
                 
                alert("Utente non attivo"); 
                         
                    </script> 
                <? 
            setcookie("Decade", "", time()-9999); 
            sleep(5); 
            ?> 
                <script language="javascript" type="text/javascript"> 
                var proprioUrl = 'http://'+window.document.domain; 
                alert("Controllare i dati inseriti"); 
                document.location.href = proprioUrl+"/dw-admin/index.php";         
                    </script> 
               <? 
            } 
        } 
} 
?> 

?>


</head> 
<body onLoad="java-script:startmenu()"> 
<div id="header"> 
<? echo"$titolo"; ?> 
</div> 
<div id="Content"> 
    <div id="Navmenu"> 
        [img]../img/article.png[/img][url="java-script:menufunc('menu1')"]Articoli[/url] 
        <hr /> 
        <div id="menu1"> 
            <ul> [*][url="articolo.php"]Elenco degli articoli[/url] [*][url="#"]Nuovo articolo[/url] [*][url='update-articolo.php']Modifica articolo[/url] [*][url='delete.php']Cancella articolo[/url] [*][url='categoria.php']Categoria[/url] [/list]
            <hr /> 
        </div> 
        [img]../img/media.gif[/img][url="java-script:menufunc('menu2')"]Media[/url] 
        <hr /> 
        <div id="menu2"> 
        <ul> [*][url='media.php']Libreria[/url] [*][url='new-media.php']Aggiungi nuovo[/url] [/list]
        <hr /> 
        </div> 
        [img]../img/setting.png[/img][url="java-script:menufunc('menu3')"]Impostazioni[/url] 
        <hr /> 
        <div id="menu3"> 
            <ul> [*][url='setting.php']Setting[/url] [/list]
            <hr /> 
        </div> 
        <?php menu(); ?> 
    </div> 
    <div id="MainContent"> 
    <? 
    $sql = "SELECT COUNT(*) AS conta FROM dw_articolo"; 
    $result = mysql_query($sql) or die(mysql_error()); 
    while($a = mysql_fetch_array($result)){ 
        $articoli =$a['conta']; 
    } 
    $sql = "SELECT COUNT(DISTINCT categorie) AS cat FROM dw_categorie"; 
    $result = mysql_query($sql) or die(mysql_error()); 
    while($row = mysql_fetch_array($result)){ 
        $categoria =$row['cat']; 
    } 
    $sql = "SELECT COUNT(*) AS media FROM dw_file"; 
    $result = mysql_query($sql) or die(mysql_error()); 
    while($a = mysql_fetch_array($result)){ 
        $media =$a['media']; 
    } 
     
    $sql = "SELECT COUNT(*) AS tot FROM dw_setting"; 
    $rs = mysql_query($sql) or die(mysql_error()); 
    while($row = mysql_fetch_array($rs)){ 
        $tot = $row['tot']; 
        if($tot == "0"){?> 
            <script language="javascript" type="text/javascript"> 
                var proprioUrl = 'http://'+window.document.domain; 
                document.location.href = proprioUrl+"/dw-admin/italian/setting.php";         
               </script> 
        <? 
        }else{ 
    ?> 
    <h1><? echo"".$_SERVER['SERVER_NAME']; ?></h1> 
     
     <? 
       echo"Benvenuto [b] ".$_SESSION['user']."[/b]
";?> 
            <table border="0" cellpadding="3" cellspacing="3" width="100%"> 
            <tr> 
                    <td align="center"><? echo"".$articoli; ?> Articoli</td> 
                    <td align="center"><? echo"".$categoria; ?> Categorie</td> 
              </tr> 
            <tr> 
                    <td align="center"><? echo"".$media; ?> File</td> 
                    <td align="center"></td> 
                </tr> 
                <tr> 
                    <td colspan="2">Si sta utilizzando la piattaforma creata da Decadeweb.it, le auguriamo una buona navigazione!</td> 
            </tr> 
               </table> 
        <? 
        } 
    } 
        ?> 
   
    </div> 
</div> 
</body> 
</html>