Wanted: Javascript / Google Analytics person

Really need someone to help me with a small project, of which I may be able to pay you for your time. I need someone who's well versed in Google Analytics, specifically the eCommerce part.

The problem we have is described here:
http://www.tatvic.com/blog/google-an...merce-tracking

I need to modify the above solution at the very end (step 3). I already have the cookie variable passed back to me via a FORM from the payment gateway. I need to know how to incorporate it into the eCommerce script so it transmits back to Google successully.

I'd really appreciate a bit of help with this.