Java Programming

Hello I'm developing a add-on for Firefox using Netbeans and FoxBeans. I want to communicate Java to Javascript because I have to call a method for a Java class from my JavaScript of the add-on. I have seen a way to do that in this site: https://developer.mozilla.org/en/JavaSc ... t_Overview

and I find the next problem, this code is well executed (I'm trying to store a Java class in a variable of JavaScript):

var myString = new java.lang.String("Hello world");

but when I try to store mi own class that is in the same package that JavaScript, the code is not recognized, I have tried with both ( the class is "JavaJavaScript" and it's in the package "content":
´
var myClass= new JavaJavaScript();
var myClass= new content.JavaJavaScript();

but this code is not recognized, so, What I have to do to store my own class in a variable of JScript???

Thank you in Advanced.