IDEA + Web Module + Tomcat 5

Hello...

I'm starting a J2EE application. I'm trying to run a sample web-module wich consists of only one servlet (only for testing). I configured my application out to work with tomcat (params under the Run | Edit Configurations menu). Tomcat starts but I can't get access to it through the explorer. What's missing? Some tutorial about development J2EE apps under IDEA are fully appreciated.

Thanks in advance