Jar in a Jar

Ok, I'm trying to do two things with jars.

1. I have a jar that holds no classes or anything like that but just files, images, and directories. I know how to import classes from a jar and use their objects, but not how to import a file from a jar within a jar?

2.Those other jars inside the main jar, can they be modified, like adding a text file to them or changing a text file with them? Like I want the main jar to be able to write to the other jars within it. And I understand there maybe a way in Java 6(not sure how) but what about in java 5?

[568 byte] By [blackmagea] at [2007-11-27 8:54:58]