Potete dirmi dove ho sbagliato?

Form Registrazione:
<form action="verifica_reg.php" method="post">
<table width="100%" border="0" cellspacing="1" cellpadding="5">


<tr>
<td width="25%">Nickname</td>
<td width="75%">
<input name="user" type="text" maxlength="255">
</td>
</tr>



<tr>
<td width="25%">Password</td>
<td width="75%">
<input name="pass" type="password" maxlength="255">
</td>
</tr>


<tr>
<td width="25%">Email</td>
<td width="75%">
<input name="mail" type="text" maxlength="255">
</td>
</tr>


<tr>
<td width="25%">Nome Manager</td>
<td width="75%">
<input name="manager" type="text" maxlength="255">
</td>
</tr>


<tr>
<td width="25%">Nome Squadra</td>
<td width="75%">
<input name="team" type="text" maxlength="255">
</td>
</tr>


<td><input type="submit" name="registrati" value="Registrati" class="Button"/></td>
</table>
Pagina verifica_reg.php
<?php
$dbhost = "localhost";
$dbuser = "beamanager";
$dbpass = "";
$dbname = "my_beamanager".

$db = mysql_connect($dbhost, $dbuser, $dbpass);
mysql_select_db($dbname, $db);

mysql_query("INSERT INTO iscritti (id,team,manager,email,nickname,password,info,id_l evel,signupdate,last_login,activated) VALUES(\"".$_POST['nick']."\",\"".$_POST['pass']."\")");

mysql_close($db);
?>
<?php
if($_POST) {
reg_success.php();
}
else {
reg_error.php();
}

function reg_success.php()
{
require 'reg_success.php';

$user = trim($_POST['user']);
$pass = trim($_POST['pass']);
$mail = trim($_POST['mail']);
$manager = trim($_POST['manager']);
$team = trim($_POST['team']);

if(!$user)
{
$messaggio = urlencode("Non hai inserito un nick.");
header('location: '.$_SERVER['PHP_SELF'].'?msg='.$messaggio);
exit;
}

$query = "INSERT INTO iscritti (,email,sesso,newsletter,attivita,messaggio)
VALUES ('$nome','$email',$sesso,$newsletter,$attivita,'$m essaggio')";
$result = mysql_query($query);

if (!$result) {
die("Errore nella query $query: " . mysql_error());
}

$id_inserito = mysql_insert_id();

mysql_close();

$messaggio = urlencode("Registrazione effetuata con successo. (ID=$id_inserito)");
header('location: '.$_SERVER['PHP_SELF'].'?msg='.$messaggio);
}
function mostra_form()
{
if(isset($_GET['msg']))
echo ''.htmlentities($_GET['msg']).'

';
?>