Hi Jan,
Its actually just raw html put into a
module.
Here is a step by step:
1. Go to the module administrator
2. Click New
3. Create your title
4. Choose the module position
5. Publish the module
6. Set the menu items you want to trigger the module.
7. Enter your html in the window.
As a starting point you could just copy and paste the modules you are talking about from the demo site or view the source and copy and paste from there. I use JCE which allows you to edit in html mode very easily ...
Hope this helps.
Anthony.