> I took a great fancy to gallery WWW.WGA.HU .
> Each index file contains the script below.
> Unfortunately HTTrack ignores the link in this
> script :
> img src="/preview_s/m/maes/c_pilate.jpg

That's an absolute path. Normally httrack will go down only.
options -> Experts -> Travel mode.

Or to get just the images options -> Links -> Get non-HTML
Or authorize jpg with a filter +*.jpg