Thanks for the reply.
In the attachment you see the page I’m building. At the left you’ll see the vertical tabs. On the right there is the tab-content.
The tab-content is quite large and you will need to scroll all the way down the read it. Once you have finished reading, you probably want to select the next chapter at the vertical tabs. But it would be nicer if those tabs (the chapters) would still be visible at the bottom of the page (when you scrolled all the way down reading the content of the first vertical tab content).
I hope you understand what i mean?