Hi Johan,
You don't need to add it to IndexPage, or Browses, or Forms.
Just adding it to the WebServer means it's added to all pages.
I think you will need to add quotes to the name though, and yes you need the .js part.
Make sure "include in ALL" is OFF. And you can see it in your pages(*) by right-clicking in the browser and "view source".
(*) It's important to understand the concept of a page here. Google will only track _non ajax PAGE requests_. If you are using Popups, or Content-Body or Front-Loading in your site then those won't count as page requests.
cheers
Bruce