These old topics mainly were about jumping around, back and forth.
In your case: You only want to skip some questions.
All questions after "internet" until "region" get the relevance equation : internet_SQ001!="Y".
Would be better you revise your design.
If you create a group for the people who "nutzen Internet im Geschäftsalltag" you just set the group relevance accordingly.
The group concept is a bit different than your used grouping "Einleitung", "Hauptteil", "Schluss".
You should use it to manage the flow of the questionnaire.
Joffm
Please note that I'm new to the tool and have no real experience with JavaScript, etc..
This is not necessary at all. Nearly anybody here knows that I can't write one line of code in javascript. But I am good at finding solutions with the built-in features.
And if you are new to LS, the first is to read the manual, at least raw.
And to study the sample surveys.
www.limesurvey.org/manual/Expression_Manager_sample_surveys