JoomlaFCK 2.6.4. - Cannot insert plugins

Hey Guys,

Im trying to activate a plug in in joomla fck 2.6

I copied the plugin to the editor/plugins folder then edited the fckconfig.js with:

FCKConfig.Plugins.Add('insertHtml', 'en');
and
['FitWindow','ShowBlocks','-','About','insertHtml']

path is: FCKConfig.PluginsPath = FCKConfig.BasePath + 'editor/plugins/' ; (which is corect)

Also everytime I modify something I clear browser catche

I simply cannot understand why it does not work.

please help
Thx,

Adrian