extending url variables

[forcer]

say the link

http://www.digitalbreeze.net/index.php?page=contact

which is done with the code::

<?php  

if (!$page) { 
include 'home.php'; 
} elseif (file_exists($page.".php")) { 
switch ($page) {  

case 'contact':
include 'contact.php';
break;
default:  

include '404.php'; 
} 
} else { 
include '404.php'; 
}
?>

when they send the email and click submit the link changes to

http://www.digitalbreeze.net/contact2.php

but instead i want it to change 2::

http://www.digitalbreeze.net/index.php?page=contact& action=sent

so by this.. i need to be able to extend the urls so i can add the &action=sent

but i cant seem to figure it out. any help appreciated

[dalecosp]

You want to set the action attribute for the form to this value then, right?

<form method=post action="index.php?page=contact&action=sent ">