[Webtest] ScriptStep Problems. How do I start?

[Ralf Müller]

Webtest is great! Thanx for the good work!

...but now I'm stuck with those script steps...

-where do I find information on how to use javascript in ScriptSteps?
it says it is natively supported, but it doesn't work for me:
java.lang.NoClassDefFoundError: org/mozilla/javascript/Scriptable
-tried to install rhino to fix this problem (but noticed that rhino is
already in the distribution). Managed to get another error with the
current version of rhino
-groovy seems to work, but where do I find documentation for the webtest API?

Thanx!
Ralf