>Thank you Dragan and sorry for having written in italian.

Mi piace... that I understand another language I never learned :). I've spoken maybe a total of six sentences of it in all my life, but I've heard a lot. I think we had a complete repertory of San Remo festival on our radio when I was a kid... and of course a bunch of Italian movies. Plus, if I happened to be on the coast during the feragosto... you got the picture.

>I knew it was a quadrant problem but i didn't know how to get rid of it.
>I'll try by calculating the angle with the function you suggest. I think
>it will be ok. Now I can start working !!!!! (I hope)

Buona fortuna! (did I get this right?)