Bind right shift and TAB won't work

[Emanuel Berg]

In w3m, I'd like to iterate anchors backwards with (right) shift and
TAB. I tried both below approaches but behaviour suggests that Emacs
doesn't sense the shift (or ignores it) when combined with TAB. C-h k
also displays the documentation for plain TAB.

(local-set-key (kbd "S-TAB")     'w3m-previous-anchor)
(local-set-key (kbd "<backtab>") 'w3m-previous-anchor)

PS. Does this group have a FAQ? DS.
-- 
Emanuel Berg - programmer (hire me! CV below)
computer projects: http://user.it.uu.se/~embe8573
internet activity: http://home.student.uu.se/embe8573