IntelliJ IDEA 11.1.2 Grails Project + JavaScript Debugging

Hello again,

I have a Grails Project which contains a lot of JavaScript Files and I want to debug the Javascript Files in IntelliJ IDEA while I run the Project .

I attatch a few Screenshots which should explain it easy :)

I searched in the manual but have no clue how I can debug Javascript in the IDE while the Grails Project is running on GoogleChrome or Firefox