The instructions of EmacsWiki (the above links) do not work. This might be because I am using emacs 24.
According to the page ColorTheme on EmacsWiki, emacs 24 has a new colour system, so I tried some colour themes and to modify them. (Menu bar→Options→Customize Emacs→Custom Themes) But I could not find the faces which I should customise.
Could you tell me how to change the colours of the menu bar and the scroll bar of emacs 24?
Environment: openSUSE 12.3, KDE 4.10.5, Emacs 24.2.1 (x86_64-suse-linux-gnu, GTK+ Version 3.6.4)