This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
If the images are in the jar file and NOT on disk, you need to access them using classes/methods that know how to look in a jar file. I don't know about the TextureLoader class. You can use the getResourceAsStream() method to read the image. Check the constructors for TextureLoader to see if it can get its input from another source.