fulltext search stemming/ spelling problems

Hi!

I'm using postgres 8.4.3 and try to get stemming/ wrong word correction
working.

I already installed the myspell dictionaries using apt-get and created
postgres dictionaries like this:

Fulltext search configuration »public.english_ispell«
Parser: »pg_catalog.default«
      Token      |            Dictionaries
-----------------+------------------------------------
 asciihword      | english_ispell,english_stem,simple
 asciiword       | english_ispell,english_stem,simple
 email           | simple
 file            | simple
 float           | simple
 host            | simple
 hword           | english_ispell,english_stem,simple
 hword_asciipart | english_ispell,english_stem,simple
 hword_numpart   | simple
 hword_part      | english_ispell,english_stem,simple
 int             | simple
 numhword        | simple
 numword         | simple
 sfloat          | simple
 uint            | simple
 url             | simple
 url_path        | simple
 version         | simple
 word            | english_ispell,english_stem,simple

But when I do, for example, SELECT to_tsvector('english_ispell',
'gitar') the result is only:
 'gitar':1

Shouldn't the word be corrected to 'guitar'?

SELECT plainto_tsquery('english_ispell','gitar') doesn't work neither:
 'gitar'

Thanks,
Corin