Hi Edoardo, a quick reply with some pointers in directions worth exploring.

First things first: if I look at the source of that page, I don't see any JS. I see pretty basic HTML. What I see is also a bunch of frames, and you should look at the source of the pages loaded in those frames if you already get what you're looking for (sorry have no time to do this for you, also you don't specify what you're after).

If you're also interested in easily executing/parsing some JS (ECMA Script v3) code, I would give something like JE a try!
Why? Because I see in the source of the page this:

<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
[download]

Saluti