I am mirroring a subset of pages of a website. The pages 
have links that are of the form:

<http://www.website.com/path/12345/page.html>
<http://www.website.com/path/34567/page.html>
<http://www.website.com/path/76543/page.html>

and so on. Part of the path changes but not the name of the 
main page in that directory. I dont have any problem 
grabbing the contents. But what happens is when I grab the 
40th page, it replaces the last one on the index and purges 
it. i.e. if the 39th link on the index page points to http:
//www.website.com/path/99999/page.html and I grab http:
//www.website.com/path/77777/page.html, 77777 replaces 99999 
as the last item on the index page and 99999 is purged! Here 
is my command line:

httrack <http://www.website.com/$number/page.html> --near 
--continue --build-top-index --cookies=1 --robots=0 
--max-rate=16000 --sockets=2 --cache=1

have I misunderstood the usage of --build-top-index ?