Big "Thank you" to the developers. Now I use it for 6 weeks and it is still running as I want it. There could be a little more documentation, but for free it is really excellent. The developers offer help by email on the backend, what I like very much, but never used. I use it with !Joomla 2.5 and it works very good. Nice is, that you can use different sizes for each page, you use it. And you can choose between some lightbox-scripts and customize the css. Good work!