Flash and Webform module - custom service

Hi,
I'm new to Drupal, and trying to set up a custom service.
I have some questionnaires built with the Webform module. I'd like to use a Flash form interface where users have the Flash plugin. So i'm trying to write a custom service to hook Flash up to the Webform database tables.

The main problem I have is that to save the form data I need to pass the $form_id from Flash -> to the service -> to a function in the Webform module. $form_id doesn't seem to be available when creating the page with the form, so I can't pass it to the Flash movie in the embed code.

Anyone with experience of forms have an idea how I might to do this, or get hold of the $form_id?

Thanks