ANT jarfile folder structure

[theo67]

Hello,

i am working for the first time with ANT and i would appreciate if someone could help me.
I want to create a jar file, where i include the folder structure to the .class files.
E.g. i have a path N:\tmp\plugins\compress
In this path are 4 .class files and one MF(=manifest).

I need to create the jar file, where if i open it i see the Folder structur \tmp\plugins\compress and in "compress" will be the .class and .MF file...

I allready have the code for creating the jar file:

<?xml version="1.0"?>
<project name="test plugins" default="build_test" basedir=".">

	<property name="src" value="./bin/test/plugins"/>
	<property name="dest" value="N:/tmp/plugins"/>
	
	<property name="compress.dir" value="${dest}/compress"/>
	<property name="compress.jarname" value="compress.jar"/>
	
	<target name="build_test">
		<copydir src="${src}" dest="${dest}"
			includes="compress/*.*"/>
		
		<jar                      destfile="${dest}/${compress.jarname}" 			          		</jar>	
	</target>
	
</project>

How could i implement somethng like this? i experimented with "pathelement" but no luck

Thanks
Theo