Change notification email from short code

I've seen something kind of similar in the forums:
http://www.gravityhelp.com/forums/topic/dynamically-populate-to-email-address-for-form-within-short-code

But my issue is slightly different.

I've built a Wordpress template file that runs a directory of members seperate to the WordPress site. for each member I want to include a contact form powered by GF. There are over 500 members. I was wanting embed the same Gravity form so that it appears on each members' page.

I was hoping to just use a shortcode but I can use a GF function. How do I change the notification email within a function or a shortcode? The email address is already set as a PHP variable but is set from a non-WordPress included file.

OK, this kind of makes sense. However I'm not only a Gravity Forms Noob I am also fairly new to WordPress. Could you unpack a few things for me? It might even help some poor lost souls in the future!

When you say put the email address in a hidden field I assume you mean adding that to the function call to Gravity Forms. I didn't know you could add extra fields. Can you tell me where I can find out more info on that? I am assuming I could just pass the PHP string to populate the hidden part of the form? The only problem with this is that I don't want to make the members' email address public. Yes, it is only viewable in the source, but I don't think the members would be comfortable with that. The whole point of having a contact form is to stop us from having to make the email address viewable.

In the documentation page you linked to, does the add_filter bit go in my functions.php file and the function change_notification_email go on the page with the form?

Thanks!

Thanks.

However if I put this code into my functions.php file:

<?php
add_filter("gform_notification_email", "change_notification_email", 10, 2);
function change_notification_email($email, $entry){
   return "test@test.com";
}
?>

How do I update the email address from the template file that includes the gravity form? It would be really awesome if the documentation page gave some real examples as I don't see how I can implement the function.