Hi,
You can also place backgrounds only on left/right pages. Ok, I'll investigate that. Is it also with overlay?
Is the content for each topic short enough for one double page or is it possible the content on a left page requires more space and continues on the next left page? The content is short enought because it is for leaflets. So, only a front page, thoose two pages and a backpage.
With the layout described above it also possible to write a environment where the content is saved and macros/buffer and placed at the end of the environment, this has the advantage to know how much space is needed and you're not forced to write the input in the order they are output on the page. I like this idea. I'll read more about macros and buffers to be able to achieve this.
Thank you a lot for your help, comments and tips. Antoine C.