Salve a tutti,
ho una pagina php:
Codice PHP:
<?php    
if(!isset($_SESSION)){session_start();}      
if(!isset($_SESSION['utente'])){      
    header("location: login2.php?azione=login");     
    exit();       
} 
?> 
<!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>pagina</title> 
</head> 
<body style="background-color:#036; width: 100%; height: 100%; display: block"> 
<div id="barra" style="height: 8%; position: fixed; top: 0px; bottom: 0; left: 0; width: 100%; background-color: #006699; border-bottom: 1px solid #133783; position:fixed !important">  
<p style="margin-top:1%; margin-bottom:1%; margin-left:1%; color:#FFF; font-family:'Palatino Linotype', 'Book Antiqua', Palatino, serif; font-size:150%; font-weight:bold; text-align:left">KnowEveryone [url="profile2.php"]<?php $utente= ucwords($_SESSION['utente']); print "($utente)";?>[/url][url="login2.php?azione=logout"]Esci[/url]</p> 
</div>  
<?php  
include 'header.php';   
print "<p class='saluto'>$utente</p>";  
?> 
</div> 
<div class="sidebar2">  
<iframe name="visualizza" width="70%" height="80%" frameborder="1" src="bacheca_visualizza6.php" style="background-color:white; border:1px solid white" scrolling="yes"></iframe> 
<iframe name="visualizza3" width="29%" height="80%" src="chat/chatpiccola.php"></iframe> 
<center><iframe name="visualizza2" width="100%" height="8%" frameborder="1" src="bacheca_input.php" style="background-color:white; border:1px solid #CCCCCC; background-color:#0165B6" scrolling="no"></iframe></center>  
</div>  
<table border=0 width=100% cellpadding=0 cellspacing=0> 
<div class="sidebar1">  
<center>  
<?php  
error_reporting(E_ALL);  
$dati = mysql_query("SELECT foto FROM utenti WHERE username='".$_SESSION['utente']."'");  
$risultato= mysql_fetch_array($dati);  
$_SESSION['foto'] = $risultato['foto'];  
echo <<<EOF 
[url="javascript:Popup('modifica_foto.php')"][img]uploads/{$risultato['foto']}[/img][/url] 
EOF; 
?>  
<iframe name="visualizza" width="65%" height="20%" frameborder="1" src="infopersonali.php" style="margin-top:10%; background-color:white; border:1px solid black"></iframe>  
<p style="margin-top:5%">[url="modifica_dati2.php"][modifica dati][/url]</p>  
<iframe name="visualizza" width="65%" max-height="25%" frameborder="1" src="statoprofilo.php" style="background-color:white; border:1px solid black"></iframe>  
</div> 
</div> 
</body>   
</html>
e questa pagina:
Codice PHP:
<?php
include('chat/chat.php');
session_start();
?>
<html>
<head>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/chat.js"></script>
<link type="text/css" rel="stylesheet" media="all" href="css/chat.css" /> 
<link type="text/css" rel="stylesheet" media="all" href="css/screen.css" /> 
<link type="text/css" rel="stylesheet" media="all" href="css/screen_ie.css" /> 
</head>
<body>
<?php
// salvo nella sessione l'username dell'utente
$_SESSION['username'] = $_SESSION['utente'];

$res = mysql_query("SELECT username FROM utenti WHERE stato = 1 AND username != '".$_SESSION['utente']."'");

while ($row = mysql_fetch_array($res)){
  // creo dinamicamente il link per aprire la chat
  echo "<a href=\"javascript:void(0)\" onclick=\"javascript:chatWith('" . $row['username'] . "')\">Chatta con " . $row['username'] . "</a>";
}
?>
</body>
</html>
Come posso fare?
Ho già provato così:
Codice PHP:
<?php    
if(!isset($_SESSION)){session_start();}      
if(!isset($_SESSION['utente'])){      
    header("location: login2.php?azione=login");     
    exit();       
} 
include('chat/chat.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> 
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/chat.js"></script>
<link type="text/css" rel="stylesheet" media="all" href="css/chat.css" /> 
<link type="text/css" rel="stylesheet" media="all" href="css/screen.css" /> 
<link type="text/css" rel="stylesheet" media="all" href="css/screen_ie.css" /> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>pagina</title> 
</head> 
<body style="background-color:#036; width: 100%; height: 100%; display: block"> 
<div id="barra" style="height: 8%; position: fixed; top: 0px; bottom: 0; left: 0; width: 100%; background-color: #006699; border-bottom: 1px solid #133783; position:fixed !important">  
<p style="margin-top:1%; margin-bottom:1%; margin-left:1%; color:#FFF; font-family:'Palatino Linotype', 'Book Antiqua', Palatino, serif; font-size:150%; font-weight:bold; text-align:left">KnowEveryone [url="profile2.php"]<?php $utente= ucwords($_SESSION['utente']); print "($utente)";?>[/url][url="login2.php?azione=logout"]Esci[/url]</p> 
</div>  
<?php  
include 'header.php';   
print "<p class='saluto'>$utente</p>";  
?> 
</div> 
<div class="sidebar2">  
<iframe name="visualizza" width="70%" height="80%" frameborder="1" src="bacheca_visualizza6.php" style="background-color:white; border:1px solid white" scrolling="yes"></iframe> 
<iframe name="visualizza3" width="29%" height="80%" src="chat/chatpiccola.php"></iframe> 
<center><iframe name="visualizza2" width="100%" height="8%" frameborder="1" src="bacheca_input.php" style="background-color:white; border:1px solid #CCCCCC; background-color:#0165B6" scrolling="no"></iframe></center>  
</div>  
<table border=0 width=100% cellpadding=0 cellspacing=0> 
<div class="sidebar1">  
<center>  
<?php  
error_reporting(E_ALL);  
$dati = mysql_query("SELECT foto FROM utenti WHERE username='".$_SESSION['utente']."'");  
$risultato= mysql_fetch_array($dati);  
$_SESSION['foto'] = $risultato['foto'];  
echo <<<EOF 
[url="javascript:Popup('modifica_foto.php')"][img]uploads/{$risultato['foto']}[/img][/url] 
EOF; 
?>  
<iframe name="visualizza" width="65%" height="20%" frameborder="1" src="infopersonali.php" style="margin-top:10%; background-color:white; border:1px solid black"></iframe>  
<p style="margin-top:5%">[url="modifica_dati2.php"][modifica dati][/url]</p>  
<iframe name="visualizza" width="65%" max-height="25%" frameborder="1" src="statoprofilo.php" style="background-color:white; border:1px solid black"></iframe>  
</div> 
</div> 
<?php
// salvo nella sessione l'username dell'utente
$_SESSION['username'] = $_SESSION['utente'];

// effettuo una query su utenti
$res = mysql_query("SELECT username FROM utenti WHERE stato = 1 AND username != '".$_SESSION['utente']."'");

while ($row = mysql_fetch_array($res)){
  // creo dinamicamente il link per aprire la chat
  echo "<a href=\"javascript:void(0)\" onclick=\"javascript:chatWith('" . $row['username'] . "')\">Chatta con " . $row['username'] . "</a>";
}
?>
</body>   
</html>
ma nel box per la chat mi mostra, quando scrivo, undefined al posto dell'utente che invia il messaggio, come posso fare per risolvere?
P.S. Lo script da solo funziona.
Grazie a tutti in anticipo per il vostro aiuto,
cicciaramba