Widescreen or full screen

[glane]

I am a newbie but thought you might be able to help me with this question. Recently, I purchased Up in the Air and Julie and Julia in blu-ray. I assumed that both movies were in widescreen, although I couldn't find anything on the case indicating one way or the other to me. For the same movie, does blu-ray come in both full screen and widescreen formats? With DVD's the cover always says whether or not it is widescreen, but how can you be sure with blu-ray. Whenever, I am purchasing a blu-ray movie at Amazon or Borders, there doesn't seem to be a choice--it's either full screen or widescreen but I don't see both being offered. By the way, both blu ray movies are advertized at Amazon as being widescreen with no full screen version, which I think may be a mistake. At Borders, the blu-ray version of Up in the Air is full screen and the DVD widescreen. And when I use the term widescreen, I mean viewing the movie with black bars on the top and bottom of the screen. Thanks for your help.

George