> I've tried to use the embedded Httrack Proxy to
> catch the link. Witch haven't worked.

What hasn't worked, catching the link or getting the page?
> I tried to login normaly and then use the same
> cookie.txt / ht-postX than my browser, the mirror
> get the structure of the page but with an empty bloc
> where the content belong.

This indicates that httrack has logged in, otherwise you'd only get the log in
page.

> I've watch the source code, and all the content is
> loaded by ajax, but if i remember well this wouldn't
> be a problem ?
That is the problem. AJax (like Java applications) has to go to the site to
perform its function. On a mirror, your computer is the site, so you get
nothing.