Howdy,

First, I'm a Linux person so I tend to do most things on the command line. 
You may need to translate what I say below to the GUI.  :)

You'll want to do two things:

1) Use the --near option - see man page below
2) Include the site where the images are hosted.  For example, I backup some
of my Google Sites.  I also want to include docs.google.com  To do this, I
append to my command:  '+docs.google.com/*' -- I use single quotes so my shell
(command line) doesn't expand the *.

For httrack options, invoke `httrack --help' or you can find the man page on
line:  <http://pwet.fr/man/linux/commandes/httrack>

I hope the above helps!

Cheers,
-pablo