Persistent URL query string throughout the entire site?

Question

This is one of those situations where I feel like there is a simple answer right in front of me...hopefully you guys/gals can show me the light.

PROBLEM :

Answer 1

So - the answer here was this :

1. Use JS to grab the query string
2. Validate the query string
3. Add to a cookie
4. Append the cookie'd query string to every href in the DOM

Like I said...I knew there was a simple example staring me in the face haha!