How do you put pictures into different backgrounds?

Question: How do you put pictures into different backgrounds!?

I dont understand how to do it! Do you know any other free websites for photoshop also!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

If you plan ahead, you can shoot your subject against a "green screen" chroma key!. Then you can put anything you want as a background!.

Link:

http://www!.chroma-key!.com/page--Chroma-K!.!.!.Www@QuestionHome@Com