Dear Sir/Madam @ distributionpropertysolutions, I'd create a javascript which is required by you, the script has 2k on size, and will do the following things:
fill in the hidden inputs in your contact form :
1. domain referrer (eg. google,yahoo,bing,etc)
2. keywords (for google,yahoo,bing already been cleanup, if others get by the url param 'as is')
3. the landing page in your domain
it is pure javascript+cookies only, all you need to do :
1. add 3 hidden inputs in your contact form
2. set the 'id' from the inputs you'd created in point 1, in the javascript
3. put the script/reference to the javascript file in your pages
Thank you, I'm looking forward to your acceptance.