how to set up library path correctly in 3.0.5?

Hello,

I've placed myLib.dll into Tomcat / lib folder.
when I run catalina my web appl works just fine - it finds the lib.
But, when I want debug JSP and run tomcat from IDEA (debug / WebApp) my web appl doesn't find this library and throws exception notfound.

what's the diff. runs tomcat by itself and from IDEA?
what I'm missing?

tnx