WebSpellChecker (WSC) is a default spell-checker in FCKeditor 2.6.5. To make SpellCheckAsYouType (SCAYT) a default spell-checker in FCKeditor 2.6.5 please follow the instruction below:
1) Open ckconfig.js (…\FCKeditor_2.6.5\fckeditor\fckconfig.js) for edit
2) Change the value of parameter “FCKConfig.SpellChecker” to “SCAYT”
It should look like:
FCKConfig.SpellChecker = ‘SCAYT’.