Quote:
Originally Posted by astarinlife
Never mind! It was missing a ; at the end. It works perfectly now! 
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Whoops that was my mistake

I'm glad you got it sorted!
For future reference, when you're editing a custom column and things aren't working I find it helpful to open the Template Editor or whatever it's called (which for some reason isn't really advertised anywhere on the help page...)
To access it, just highlight a book row in your library and click on the custom column entry (as if you were going to edit the entry if it was a simple column like title, author etc) and the editor should pop up and look like the attached pic. It updates in real time so you can play around with the coding to get it to work