My wife and I got a dog from the pound about 4 months ago. When we got her, I had to go out of town for a month and a half. Upon getting home, this skiddish dog would pee when I would walk through the door. She was like that with all people except my wife. The vet told us to bring the dog to Wal-Mart, and just sit outside of walmart and pet her telling her she is a good girl. The vet said that sooner or later, as folks wanted to pet her, she would figure out that people were a good thing cause they like to pet her!
haven't done the walmart thing, but bringing her to obedience class and exposing her to friends at group outings has done the same thing. all you must do is build that confidence in the dog and prove you are a loving owner.

Beej