Thank you Cyberek,
it works very fine.
Just last little question.
In original configuration (without override) logo display above text and background image was all visible (see before.jpg).
before.jpg
Now, i use template override because of i need two different logos: one for the header and one for menu bar.
So i disabled template logo display in header and i replaced it with a simple image added to html code in header description.
In this way, background image switched to upper dimension and i can't see it all. As you can see, people on right side of the image was cutted.
after.jpg
For the moment i have to reduce textual contents in header but is just a temporary workaround.
Can i do better?
Thank you.