[development] Custom Webform Module

[Lynn Stott (Stott Design)]

I have a module that creates a web form for users to fill out. I'd like to track different campaign that access the same web form using a different URL so I can track hits and conversion rates for each URL. For example
www.mywebsite.com/myform?campaign=june
www.mywebsite.com/myform?campaign=july

How in the module can I capture the extension (after 'campaign=') and redirect the user to a unique confirmation page based on the extension?

Thanks,
Lynn