I have a form that I am currently using on my site for newsletter subscriptions. The top form is for subscribing with double opt-in and when the Subscribe button is clicked an email is sent to me with Subscribe in the subject line and the customer is taken to a page thanking them for subscribing and reminding them that they need to click the link in an email they receive in order to confirm the subscription.

When they click the link in the confirmation email, they are then taken to the welcome page. If email cannot be verified, other pages will load, etc.
The bottom form is a single opt-out and when the Unsubscribe button is clicked an email is sent to me with Unsubscribe in the subject line and a pop up screen appears to the customer stating they've been removed.

So my question is...How can I have ONE form with both the Subscribe and Unsubscribe buttons sending the appropriate subject lines & required information to my specified email address (not the cart owner email) and have all the pages load inside my cart?

Is it possible to modify the band_signup to handle all this?
My current set-up can be seen here:
http://www.countryneedle.net/index.php?main_page=page_3
Thanks!