Is it just me or is this part missing a comma operator?
PHP Code:
form action="mail ("e-mail address","Hosting" "message")";
I don't get that part anyway, are you trying to incorporate PHP with HTML there? Because that's one strange HTML tag.

In other words, you can't add the mail() function into the top of the form. You'll gather all the form input first, then at the end just call the mail() function with all the apporopriate parameters.