Well this was a very difficult question, and I hope you are using PHP if not
then you should really remember to post a language you need it in next time.
PHP has no built in functionality to make faxes. However, there is a company
called Interfax (
http://www.interfax.net/en/index.html) which allows people to
use PHP (with some SOAP extensions installed) to send faxes through their
network, for a monthly service and per page charge. This is probably your best
option.
If you need a script that is more intensive than this you will need to find
someone to make a backend program for you (assuming you have a dedicated
server) and try to convert the forms to PDF files when they are submitted, then
send the PDF files to another application that would take care of the faxing
for you.