danoschek: I use the method James indicated and it works perfectly easily for me.
The only trick I find is knowing what the text is that has been coded, then while viewing the souce you do a simple find and it takes you to the correct spot where you can look at the code around the words that you already know are coded.

This method is particularly useful if you are ever browsing the web and you see something in particular on any webpage that you really really like and want to learn how to emulate it