There are various method to do so, for example you can always use PageNest tool. It will allow you to copy whole websites on your disk.
It Will copy either the page, or the entire site (whichever you prefer) to your hard disk. It will create an exact copy of what you see in your browser including the text, html, images and css.
http://pagenest.com/Thanks for thinking along, the problem with this solution however is that the topic i want to copy has more than 1000 pages and in don't want the whole of bitcointalk.org on my computer.