hacking subscribe2

Save my life!
I’m working on a project for school in which Subscribe2 would be perfect to use. BUT I’d like to use it twice, or rather double the number of emails.

I’m trying to do a sort of tell-a-friend sort of email sign-up. So I’d like folks to put in two emails rather then one (theirs and a friends) and then I would like for it to send out a different email to each of them.

I figured there are two ways of doing this:
1) putting two subscribe plugins on my site.
*I tried this by changing every “2” to a “3” I uploaded it and I get a:
Fatal error: Cannot redeclare main() (previously declared in /homepages/22/d95365795/htdocs/tithe/subinsert.php:130) in /homepages/22/d95365795/htdocs/tithe/subinsert3.php on line 130
Any advice?

2) I can incorporate an extra email field into the current plug-in.
*I tried to start doing this but I got confused. I was gonna just copy and paste everything into one thing but we’ll, I’m lost.
Anyone willing to do that for me?

I NEED this by Friday, absolute necessity.

or something else that works well! let me know.