[TYPO3] TemplaVoilà: wrap every second content element

[Manuel Reinhard]

Hello!
I'm new to this list and hope you guys can help me!

I'm using TemplaVoilà on my Typo3 site.
Now I'd like to warp every second content element of a certain  
content area.

Example:
I defined the area "main content" and put in some content elements.  
Now I would like every second content element to be wrapped so there  
would be something like this:

  <div class="anything">my content element</div>
my content element
  <div class="anything">my content element</div>
my content element
...


I found something on this page
http://www.typo3wizard.com/de/artikel/das-content-objekt.html
but that's not working for TemplaVoilà.

Any ideas?
Thx!
Manuel Reinhard
Switzerland