JDBC REALM, classnotfound exception

[Alex A. Almero]

here's my xml entries,

<RequestInterceptor                                                    
            className="org.apache.tomcat.request.JDBCRealm"                    
            debug="99"                                                         
            driverName="com.informix.jdbc.IfxDriver"                           
 connectionURL="informix-sqli://ip:port/authority:informixserver=dbsvrname
            connectionName="test"                                              
            connectionPassword="test"                                          
            userTable="users"                                                  
              userNameCol="user_name"                                          
              userCredCol="user_pass"                                          
            userRoleTable="user_roles"                                         
roleNameCol="role_name" />

what particular /lib directory will i put my driver.jar? is it on 
/usr/local/tomcat/lib?

thanks 
alex  

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