Plugins.Add
This option allows you to add a plugin situated in the PluginsPath. The plugin file should always have the name fckplugin.js and should be situated in a subdirectory of the PluginsPath.
Example: we want to use a plugin called tablecommands. We create a subdirectory called tablecommands in the PluginsPath and put the file fckplugin.js (with the plugins code) in it. To add this plugin to FCKeditor point to its directory name:
FCKConfig.Plugins.Add( 'tablecommands' ) ;