Original External Referrer URL Javascript

[George_Hoffman]

I'm trying to add Javascript that pulls Original External Referrer Url into a hidden form field. This is the Javascript that I will be using (from this discussion😞

1. <script> 
2. MktoForms2.whenReady(function(form){ 
3.   form.setValues({ 
4.     OriginalExternalReferrer : document.referrer 
5.   }); 
6. }); 
7. </script> 

Do I need to place this script on the landing page or in the form somewhere? If on the form, where do I place this?