AdWords Conversiom Tracking Accross Subdomains

Hi

I thought I would ask the question here before I go head first into a lot of code.

I have a clients site that has AdWords conversion tracking code installed correctly on a specific page. The problem is that the Google AdWord group send the click to a particular sub domain specific to that AdGroup, then the final action after completing the form is on another subdomain.

The conversion does not get logged or tracked.

I have read up on the subject and it does appear to be a problem that others have experienced. I was wondering if anyone else has experienced a similar problem?

The solution is probably going to involve a catch net script to make sure that the correct variables are recorded and passed onto the final page. It might also be necessary to do some form processing and conversion tracking prior to moving to the final subdomain.

Any thoughts or references on this topic would be greatly appreciated.

Thanks