war classpath problem

[lio tomcat]

Hello world,
 My war and i have some problem for loading some class that are embedded in 
jars in myWar/WEB-INF/lib...
I tried to solve this by writing a proper myWar/META-INF/MANIFEST.MF with no 
success. It simply ignores
it.
 I don't have anymore idea. May you give me some clue?
At list a sample of a manifest file for a war file, please.
 thx,