movie id tt0438097 can be found at http://www.imdb.com/title/tt0438097/
What's the url for its poster image?
As I'm sure you know, the actual url for that image is
You're going to be hard pressed to figure out how it's generated though and they don't seem to have a publicly available API.
Screenscraping is probably your best bet.
The picture seems to generally be inside a div with class=photo and the name of the a tag is poster.
The image itself is just inside the a tag.
