mandare a imprimir la consulta la variable y el erro q me muestra talve me puedan ayudar en esto
le agradesco mucho de ante mano cualquier ayuda

este es el index
<?php
session_start();
require 'lib/db.php';
require 'lib/facebook.php';
require 'lib/fbconfig.php';
$facebook=$_SESSION['facebook'];
$userdata=$_SESSION['userdata'];
$logoutUrl=$_SESSION['logout'];
//Facebook Access Token
$access_token_title='fb_'.$facebook_appid.'_access_token';
$access_token=$facebook[$access_token_title];
$urlAuth = "http://www.facebook.com/dialog/oauth?client_id=317650351588521&redirect_uri=http://apps.facebook.com/aplicacion/&scope=read_stream,user_status,publish_stream,email";
$signed_request = $_REQUEST['signed_request'];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', ' /')), true);
?>
<!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" />
<link href="css/estilo.css" rel="stylesheet" type="text/css" />
<title>Documento sin título</title>
</head>
<body>
<div id="pestanas" >
<ul>
<li class="activa"><div id="pest1"><a href="javascript:void(0);" onClick="parent.location='http://apps.facebook.com/aplicacion_fbk/?ref=bookmarks&count=0&fb_source=bookmarks_apps&fb_bmpos=1_0';">Inicio</a></div>
</li>
<li >
<div id="pest1"><a href="javascript:void(0);" onClick="parent.location='http://www.facebook.com/apps/application.php?id=100003284666917';">Fan page</a></div>
</li>
<li>
<div id="pest1"><a href="javascript:void(0);" onClick="parent.location='http://apps.facebook.com/aplicacion_fbk/invite.php';">Sugerir amigos</a></div>
</li>
</ul>
</div>
<?php
if (empty($data['user_id']))
{
echo "<script language=javascript>window.open('$urlAuth', '_parent', '')</script>";
}
else
{
//print_r($userdata);
$facebook_id=$userdata['id'];
$name=$userdata['name'];
$first_name=$userdata['first_name'];
$last_name=$userdata['last_name'];
$email=$userdata['email'];
$gender=$userdata['gender'];
$sql="Select * FROM users where facebook_id=".$facebook_id;
$resultado=mysql_query($sql) or die (mysql_error());
if (mysql_num_rows($resultado) == 0)
{
mysql_query("INSERT INTO users (facebook_id, name, email, access_token) VALUES ('$facebook_id','$name','$email','$access_token')");
}}
?>
<br>
<center>
<br>
<IMG src="css/en_construccion.gif" style="margin-right: 15px; padding:5px; background-color: #f5f5f5;
border: 1px solid #999999; ">
<br><br>
</center>
</body>
</html>
<?php
require_once ('listuser.php');
?>
este es fbconfig
<?php
//Configuración de nuestra aplicación con los datos de Facebook.
$facebook_appid='xxxxxxxxxxxx';
$facebook_app_secret='xxxxxxxxxxxxxxx';
$facebook = new Facebook(array(
'appId' => $facebook_appid,
'secret' => $facebook_app_secret,
));
?>
este es el db
<?php
define('DB_SERVER', 'xxxxxxxxxx.com');
define('DB_USERNAME', 'xxxxxxx');
define('DB_PASSWORD', 'xxxxxxxx');
define('DB_DATABASE', 'xxxxxxxx');
$connection = mysql_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD) or die(mysql_error());
$database = mysql_select_db(DB_DATABASE) or die(mysql_error());
mysql_query ("set character_set_results='utf8'");
?>