CodeCogs, you missed additional "s" in http://latex.codecogs.com/integration/fckeditor/editor/plugins/tagprocessors/ url. The link is broken.

In /equation and /tagprocessors direcories you put two different files with the same name: fckplugin.js. Is it correct to copy these two into ~fckeditor/editor/plugins? How should I rename the later (tagprocessor plugin) and what about equation.gif (should I put it right next to .js files)?

Thanks