title: Use Cookies for "entering" referral tracking utilizing document.referrer?
body: <p>If one comes to my site from say nextag.com, goes through a couple pages and gets to my Thank You page after ordering, is there a way to (for all intense and purposes) put an alert on the Thank You page saying "Thanks for coming from nextag".  I can utilize this answer to do other code on the Thank You page.</p>
  
  <p>I know I use document.referrer to grab all incoming referrals, however if one goes through a few pages on the site it looses its "entering" referral, I need to grab the "entering" referral and use it on the Thank You page.  Do I somehow use cookies to do this?</p>