Data comes *from* a website or goes *to* a website?
from a webform: insert from url (scriptstep) could be helpfull. You get the data into a FileMaker field for further processing.
You could also use a webviewer and get the data as attribute:
'GetLayoutObjectAttribute ( "wv" ; "content")'
'wv' means the name for the webviewer object (You can choose whatever name You like)
What does the web form do? Is there a button that sends an email? Is there a script that submits it to a database (e.g. MySQL)?