I'm trying to send a preformatted email to the user when they perform a certain action.  The main goal is to use the paypal IPN handler to send the message.  But I'd be happy if I can just figure out how to send an email when a user clicks a particular button.  I've seen the following code:

    Mail.SendMail("FROM@ADDRESS.COM", "TO@ADDRESS.COM", "", "THIS IS THE SUBJECT", "THIS IS THE MESSAGE BODY", "", "HTML", "", "", "", "" );

I'm not sure how to implement this code.  Would this simply go in the header of a text module?  Would I use an onclick event to call it?  Any help would be appreciated.

James