Add to cart popup template location

Does anyone know what template controls the add to cart pop-up, the ajax one that comes up every time you add a product to the cart and then automatically fades away?

I need to add some tracking code and can’t seem to locate any files related to the add to cart pop-up. I also tried design mode, but it didn’t seem to list the underlying template.

Thanks for your help.


Thank you. I appreciate it.