I am trying to implement an autocompletion like Stack Overflow does for tag completion. however, I tried to view the source and its [minified](http://cdn.sstatic.net/Js/tageditor.js?v=e2213ce7a902) 

I am trying to get features like letting the user add any tag, if it exists in the list then fine, or else add it to the database.

Are there examples out there that would show how to get something like this done? or can I somehow view the non minified version of the source?