PHP form to email thank you page

Hi,
my form to email does work, I just want an event to happen when you click submit. When a user clicks submit, I want them to be taken to a thank you page. I created a success.html page but am not sure how to code it in so this event occurs. Here is my code, I will leave out password and personal email information. Thank you.

<?php
require_once "Mail.php";
if (isset($_POST['submit'])) {
// get name
$name = trim($_POST['name']);
// get email address
$email = trim($_POST['email']);
// get comments
$comments = $_POST['comments'];
$comments = trim($comments);
$comments = stripslashes($comments);
$comments = htmlspecialchars($comments);
}
$from = $_POST['email'];
$to = "Me <[email protected]>";
$subject = "Comments from website";
$body = $_POST['comments'];
$host = "mail.domain.com";
$username = "[email protected]";
$password = "password";
$headers = array ('From' => $from,
'To' => $to,
'Subject' => $subject);
$smtp = Mail::factory('smtp',
array ('host' => $host,
'auth' => true,
'username' => $username,
'password' => $password));
$mail = $smtp->send($to, $headers, $body);


// check antiSpam field
$antiSpam = trim($_POST['antiSpam']);

if (!empty($antiSpam)) {

exit;

}


?>

 

Thank you, those articles are great. I was able to fix this issue. Thanks.