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FCKEditor plugin is a very useful plugin for WordPress – no doubt about that. However spell check integration with this plugin takes a bit of hands on if you host your blog from non-Windows OS, and edit your posts with non-Microsoft Internet Browser (IE). Yes, Windows/IE are defaults that FCKEditor plugin comes with.

Below "how to" will guide you step-by-step on integrating spell checking capabilities with FCKEditor. Here I used Ubuntu Linux OS as an example, but these instructions are good for any Linux distro just replace Ubuntu’s "apt-get install" with analog in your Linux OS.

1.     First thing first, in order to integrate a spell checker we will NEED a spell checker. For that we will install "aspell", and appropriate (English, in this case) dictionary "aspell-en". There is an 85% percent chance that if you have a Linux OS installed, you have aspell. You can just search for it, or try to run it to see if you do. If you don’t then install it by:

sudo apt-get install aspell

At this point (whether you just installed it or had already installed) try to run it like this:

echo "I mispeled it" | /usr/bin/aspell -a --lang=en_US --encoding=utf-8 -H

If there is no English dictionary installed you should see:

Error: No word lists can be found for the language "en_US".
-bash: echo: write error: Broken pipe

Let’s fix that by installing the dictionary:

sudo apt-get install aspell-en

Now if you run the command above, you should see aspell looking up "mispeled" in its aspell-en dictionary, identifying that it is spelled wrong, and offering you choices of correct spelling from that dictionary:

echo "I mispeled it" | /usr/bin/aspell -a --lang=en_US --encoding=utf-8 -H
@(#) International Ispell Version 3.1.20 (but really Aspell 0.60.4) * * * & mispeled 16 21: misspelled, misapplied, misled, dispelled, misfiled, misruled, mislead, spelled, spieled, misplaced, misplayed, misspell, misfield, misspend, simpled, misplay

Ok, so from Linux side, we are ready with Aspell, now let’s begin the integration.

2.   From WordPress FCKEditor’s plugin directory open
"_{wp-content/plugins/deans_fckeditor/custom_config_js.php}" file* and set the following variable:

FCKConfig.SpellChecker = 'SpellerPages';

If you already have this variable set to something different, like "IESpell", just replace it with "SpellerPages"

This will do two things: it will redirect all the spelling requests to
"_{wp-content/plugins/deans_fckeditor/fckeditor/editor/dialog/fck_spellerpages/spellerpages/server-scripts/spellchecker.php}", and, since "spellerchecker.php" exists (comes with plugin) it will enable the spell checker button:

^*NOTE: Depending on a version of the plugin, the file to edit might be "fckconfig.js" or "fckconfig_js.php"

3.   Almost there. The last thing to do is to tell "SpellerPages" to use Linux’s aspell, since by default it is configured to use it on Windows OS. For that edit
"_{wp-content/plugins/deans_fckeditor/fckeditor/editor/dialog/fck_spellerpages/spellerpages/server-scripts/spellcheker.php}" by setting "$aspell_prog" variable to ‘aspell’ instead of "C:\Program Files\Aspell\bin\aspell.exe". That is what it should look like after you make a change (comment/uncomment):

//$aspell_prog  = '"C:\Program Files\Aspell\bin\aspell.exe"';   // by FredCK (for Windows)
$aspell_prog    = 'aspell';                                                        // by FredCK (for Linux)

Good job! Now you can login to your WordPress blog and enjoy the spell checking capabilities within your FCKEditor!