changing the format of the subject line when emailing pages?

first, thanks for adding the "send to a friend" functionality to this module. this module officially rocks. now i have a simple question: how do i change the format of the subject line in the email that's sent? i've looked through all the files, and i can't find it anywhere. i want to change it to something like "site url - page title."

i'm lost! i've figured out how to change the text of the link itself, and i've seen where i can change the formatting of the email itself (the css), but i can't figure out how to change the subject line.

thanks again for all your hard work on this awesome module.

debra