Codice PHP:
<?php

//testare la sessione
    
if(isset($_SESSION['logged'])){
        
header("Location: usercontrol.php");
        
        echo 
"

Benvenuto utente: "
. @$_SESSION['user_name']; // l'echo è inutile xkè ti reindirizza
    
}else{

?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF'?>">
<table class="table_login" summary="Login Utente">
<tr>
    <td>Login:</td>
    <td><input type="text" class="input_registrazione" id="user_name" name="user_name" maxlength="200" value="" onfocus="setStyle(this.id)" /></td>
</tr>
<tr>
    <td>Password:</td>
    <td><input type="password" class="input_registrazione" id="user_pass" name="user_pass" maxlength="200" value="" onfocus="setStyle(this.id)" /></td>
</tr>
</table>

<div class="" id="">
    <input type="hidden" name="login" value="ok" />
    <input id="sumbit_login" class="sumbit_login" type="submit" value="Accedi" />
</div>

<div class="recoverypassword" id="">[url="forgotpw.php"]Recupera Password[/url]</div>
<div class="register" id="">[url="register.php"]Registrazione[/url]</div>
</form>
<?php
}
?>