Untitled

<?php
 session_start();
 if (isset($_POST['username']))
 {
 if ( $_POST['username'] == 'inte' &&
 $_POST['password'] == '2047')
 {
 $_SESSION['logged_in'] = 'true';
 }
 else
 {
 echo '
 <i>Incorrect login details.
 please try again</i><br />';
 }
 }
 if (! (isset($_SESSION['logged_in']) &&
 $_SESSION['logged_in'] == 'true') )
 {
 echo '
 <html>
 <head>
 <title>Login form</title>
 </head>
 <body>
 <form action="' . $_SERVER['PHP_SELF'] . '"
 method="POST">
 <div id="logincontainer">
 <div id="usernamelogin">
 Username: <input type="text"
 name="username" />
 </div>
 <br />
  <div id="usernamepassword"/>
 Password: <input type="password"
 name="password" />
 </div>
 <br />
 <input type="submit" value="Login" />
  </div>
 </form>

 </body>
 </html>
 ';
 exit;
 }
?>