LiveConnect: XUL JavaScript <-> Java

Hello!

I am working on the connection between my XUL GUI with JavaScript and
my Framework in Java.
For this I wanna use LiveConnect.

Calling java-methods from javascript works fine. I already have managed
that. (I'm calling the methods by
Packages.packageName.JavaClassName.methodName(); )


But now I have to get it working in the other direction. I want to call
a JavaScript function from my java framework. How can I do this?

I have tried it with creating an object of the java-class in javascript
and calling the java-method, that trys
Code:
JSwindow = JSObject.getWindow(this);
JSwindow.call("functionName", null);

But I can't acces my JavaScript.

Do I need to allow the access expizit? How do I do this in XUL/JS?

Or do I have to load the java-class as an applet?

Thanx for ur help!