> I've been using HTTrack extensively over quite a few
> websites and had found myself with many "lost" pages
> due to javascript problems (such as complicated
> functions).
> <http://lxr.mozilla.org/mozilla/source/js/narcissus/>

Humm, yes, this is a known possibility, but which would require great
efforts.

See also: 
<http://forum.httrack.com/readmsg/1662/index.html?pid=1646&days=10000&js=1&lang=en>