> How can i download another web(s) that will be ADDED to 
my 
> ~/webs/ directory and i will get next link in 
~/webs/index.
> html ?
cd ~/webs/
httrack --continue <http://www.someweb.com/> 
<http://www.anotherweb.com/>

(this will quickly rescan the existing site to rebuild 
crossed-links, too)

and if you need a third site to be added:

cd ~/webs/
httrack --continue <http://www.someweb.com/> 
<http://www.anotherweb.com/> <http://www.againanotherone.com>