Thanks Robber!
Working this into my site. I forgot to mention it's a wordpress site, so perhaps a little more tricky working with the loop. My content is searchable, which puts the search results on a different page than the index. Can I place the code in my header, which appears on every page regardless if it's index, search, archive, etc...?
Also, does this store the id to cookies? I would like to have the user's ID cookied, so it appends the link every time the user visits, without them having to enter the id every time.
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