Unable to Find Class Definition

I am new to Tomcat.  What I am trying to accomplish is keep all my jar files separated so I know what jar provides what functionality.  In the WEB-INF/lib directory I've added sub directories for the different jar files in the web application.  

  WEB-INF/Lib
        |_antlr-2.7.6
        |_mysql_connector-5.0.7
                |_mysql_connector-java-5.0.7-bin.jar

What I am trying to figure out is how to tell the web application to look in the subdirectories.

Any suggestion swould be appreciated.

Russ