Choose one of them and in fckeditor.config.js tell FCKeditor to use it (add one of the following lines at the end of file):
FCKConfig.SpellChecker = 'ieSpell' ; //or FCKConfig.SpellChecker = 'SpellerPages' ;
More information about ieSpell and Speller Pages / Aspell installation can be found in the FCKeditor documentation.
$aspell_prog = '"C:\Program Files\Aspell\bin\aspell.exe"';
In linux:
$aspell_prog = '/usr/bin/aspell';
however in some cases this setting should also work:
$aspell_prog = 'aspell';
['Cut','Copy','Paste','PasteText','PasteWord'],
and add SpellCheck button at the end:
['Cut','Copy','Paste','PasteText','PasteWord','SpellCheck'],
FCKConfig.FirefoxSpellChecker = true ;
to fckeditor.config.js