movie id tt0438097 can be found at http://www.imdb.com/title/tt0438097/
What's the url for its poster image?
Check out http://www.imdbapi.com/, It returns Poster url in string.
For example, check http://www.imdbapi.com/?i=&t=inception and you'll get the poster address: Poster":"http://ia.media-imdb.com/images/M/MV5BMjAxMzY3NjcxNF5BMl5BanBnXkFtZTcwNTI5OTM0Mw@@._V1._SX320.jpg"
Update: Seems like the site owner had some arguments with IMDB legal staff. As mentioned in the original site, new site's address is http://www.omdbapi.com/