Thanks Paul for the link and pointing out some great work done by Phil.
After poking around, I was able to back port this from 4.3 to 4.2.1.
Here is what I did, run the attached scripts which are basically taken from the DB scripts for 4.3.
I then had to copy the folder -
skin1\modules\HTML_Editor onto my xcart folder.
Carefully update or add the files located at -
modules\HTML_Editor\config.php
skin1\main\start_textarea.tpl
skin1\main\textarea.tpl
Once you do so, just follow the manual for xcart to switch between the 3 editors
