Code Help Please

[smartcard]

In the following code, instead of "echo "SUCCESSFULLY!" how can I forward to another php file like instead of displaying SUCCESSFULLY! message, I need to forward to another PHP file

<? session_start();

if($_POST['code']!=$_SESSION['string']){
echo "SECURITY CODE ERROR... ";
}else{
echo "SUCCESSFULLY!";
}

?>

[jatar_k]

replace the echo line with the header [php.net] function