Tied to the Browser
If you are going to modify the Google Analytics tracking code or try to add any dynamic functionality, there are a few technical points that you need to understand.
For example, at the very end of the standard tracking code, the _trackPageview() method is called. This is appended to the pageTracker object by adding a period, so it looks like pageTracker._trackPageview(). There are a few dozen other methods defined in ga.js, and they are all called in the same way.