As I said, this topic has been discussed before, but i'm tired, and don't want to search.
How do I make the lips of characters move in custom dialogs in custom areas?
Found this for you GB:
http://www.pcgamemods.com/mod/14116.html)
Not sure how it works, havent tried it myself.
Here is a tutorial in General Tutorials of Holowan
http://www.lucasforums.com/showthread.php?t=126746)
If you want the most accurate (and least painful) method of creating lip files go with JdNoa's LipSynchEditor. Of course I may be biased ;)