Thank you Tom, those are the "cartboards" that I meant.
... and thank you Gert too... I've read the thread that you suggest. It's the right one for me, now I've an idea about what I need for.
I'm really sorry if I ask continually your help, but I really don't speak deutch (even if to be honest I worķ for a couple from Munich) and I'm sometime not able to found the thread in this forum
Thank you again
Have a nice evening
Claudio