How to use a jar-file in an Application Service - NWDS 7.01

Hello everybody,
I want to create an Application Service in SAP NetWeaver Developer Studio 7.01.05. Can you explain me how i can import an external jar into my project?
I found out that I can implement or create simple java files:
Java Perspective --> package project_name.utils --> insert/create java file
I try to add the jar into the java build path of my project, but when i build it the jar is gone.
I would be very thankful for every hint.

solved
[http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/60d99678-1a29-2d10-94b4-9d9a67b7199b]

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