Why can't I load the image files in the Jar file?

I make an application in a structure bellowing:
A.class
images\a.gif
images\b.gif
and I packed all of them(include the images directory) into a A.jar file.
when I run the A.jar file,the application can't load the images in the Jar file.
How can I do to solve this problem?

It isn't working. The URL that is returned is blank. I tried rearanginf my stuff a little. Now it is set up like the other guys. So all the classes aren't in a package. so its:
MyClass.class
Sounds/mysound.wav
all of this is in a .jar file. If it isnt in a .jar file it works. Bit I have mor than one class so I would really like it in a .jar file. But when it is MyClass.class.getResource("sounds/mysound.wav") returns nothing. Not null. Just blank.

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Why can't I load the image files in the Jar file?

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