Untitled

<?php
if ( empty($_POST) )
{
?>

<!DOCTYPE html>
<html>
    <head>
        <meta charset='utf-8'>
        <title>MayBe</title>

        <style type='text/css'>
form {
    width: 450px;
    margin-right: auto;
    margin-left: auto;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 13px;
    color: #333333;
    padding: 10px;
    margin-top: 50px;
    border: thin solid #AEAEAE;
    background-color: #a1bdd5;
}
legend {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    font-weight: bold;
    color: #333333;
    padding: 2px;
}
label {
    margin: 10px;
}
.submit {
    margin-left: 50px;
}
.link {
    margin-left: 350px;
}
        </style>
    </head>

    <body>
<form id='form1' name='form1' method='post'>
<fieldset>
<legend>Area riservata</legend>
<p> </p>
<p>
<label for='textfield'><strong>Username</strong></label>
<input type='text' name='username' tabindex='10' id='textfield' />
</p>
<p> </p>
<p>
<label for='label'><strong>Password</strong></label>
<input type='password' name='password' id='label' />
</p>
<p> </p>
<p>
<label for='Submit'></label>
<input name='Submit' type='submit' class='submit' id='Submit' tabindex='30' value='Invia' />
</p>
</fieldset>
</form>
    </body>
</html>

<?php
}
else
{
  $username = $_POST['username'];
  $password = $_POST['password'];

  if ( ($username == "admin"  and $password == "admin")
  or   ($username == "matteotti" and $password == "matteotti111")
  or   ($username == "marconi"   and $password == "marconi123") )
  {
    <?php phpinfo(); ?>

  }
  else
  {
    echo "<center><h2><font color=#FF0000><h2>Accesso negato.</font></h2><br>Le credenziali inserite non risultano valide.<br><a href=\"javascript:history.go(-1)\">Clicca qui per tornare al form e reinserire username e password.</a></center>";
    die;
  }
}
?>