how could I customize the other scrollbar?

[Yu-ning Feng]

hello,

  I was trying to customize the scrollbar of my iceweasel*. I
discovered that there were in fact 2 different  kinds of scrollbars
which icew handled differently. I could customize the one appeared in
the history sidebar (and other windows for buildin functions of the
browser), by modifying userChrome.css. However, the scrollbar of the
browsing document did not change accordingly. Any explanation? and,
possible solution?
  Thanks very much for your information.


*( ID:Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.8.1.13)
Gecko/2008031100 Iceweasel/2.0.0.13 (Debian-2.0.0.13-0etch1))
** a screenshot: http://www.mediafire.com/?nuiw2wtw9z3