Update fckeditor to version 2.3.1.
A custom configuration file has been created under web/includes/javascript/fckconfig_custom.js
All global changes to the fckeditor configuration should be placed in the above file. The fckconfig.js should not be modified.
All local changes to the fckeditor configuration should be placed in a new custom js file and invoked using the fck tag.
Please refer to link below for details.
http://wiki.fckeditor.net/Developer's_Guide/Configuration/Configurations_File