Email Class: Send dynamic text from file?

[eluser]kabbink[/eluser]
Hello all!

This might be a fairly simple question but I've been working all day so maybe I've just lost it!

All I want to do is be able to send an email (preferably using the built in email library)
which is stored in a separate file but also has some dynamic variables in it.

Here is some pseudo code of what I am trying to do:

I would have a file called email.php containing something similar to:

Code:

Dear {$customer_name},

We appreciate your business!

Then send the email with something like:

$data['customer_name'] = 'Joe';
$this->email->message(email.php, $data);

Hope that made sense!
Thanks for all the help!
Kevin