Logout Button

[loserWILL]

I have a file called liindex.php - and at the bottom of all the content is my 'logout' button. At the moment, it isn't showing.

<?php 
include "config.php"; 
if ($_GET ["action"] == "submit") { 
    $notes1 = $_POST["notes"]; 
    mysql_query ("UPDATE notes SET notes='$notes1'"); 
    echo "The notes have been succesfully edited.<br />"; 
} 
?> 
<form action="?action=submit" method="post"><textarea name="notes" 
    cols="40" rows="6"> 
<?php 
$sql = mysql_query ( "SELECT * FROM notes" ); 
while ( $fetch = mysql_fetch_array ( $sql ) ) { 
    ?> <?php 
    echo $fetch["notes"]; 
    ?> 
 
<?php } 
?> 
</textarea> <br /> 
<input type="submit" value="Edit Notes" /></form> 

      <?php 
  include "config.php"; 
   
  if ($action == "liindex.php") { 
    if ($_SESSION ["session_username"] == "") { 
        echo "You're not logged in."; 
        exit (); 
    } 
    echo "<a href=\"login.php?action=logout\">Logout</a>"; 
} 

if ($action == "logout") { 
    if ($_SESSION ["session_username"]) { 
        session_unset (); 
        session_destroy (); 
        echo "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">";   
        exit (); 
    } else { 
        echo "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">";   
    } 
    } 
  ?>

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