Capture Google UTM tracking codes in a Wufoo lead form

My little business collects leads via Wufoo forms embedded in our website. Typically the website visitor follows a link from Adwords, Facebook Ads or email to a landing page on our website, then clicks to the enquiry form page (in which a Wufoo form is embedded) and sends an enquiry. I want that enquiry form to contain fields for Source, Medium and Campaign which are to be prefilled from the UTM codes. I have set up a demo landing page and enquiry page so you can see the set up at: [login to view URL] Wufoo has linked to a blog page from 2008 showing how to do this (using a previous Google Analytics system): [login to view URL] I need to be able to replicate your solution on several pages of our website, including pages we will add in future. What I want you to do is: - create a system for adding UTM codes to this form. Wufoo has a free plan and Squarespace has a free trial so you should be able to test this at no cost other than time. - give me the log in to your demo Wufoo and Squarespace accounts so I can see how it works. - give me idiot proof instructions as to how to make this work. This can be in an email or on the Squarespace site if that is easier. Do ask if you have any questions.