Hello, I have a question. Does anybody know about javascript rich text / HTML editor, that could easily show small popup under carret (or certain word) while t

Hello, I have a question. Does anybody know about javascript rich text / HTML editor, that could easily show small popup under carret (or certain word) while the user is typing? I mean something like the spell-checker in this google wave demonstration - see at 0:44:40 http://www.youtube.com/watch?v=v_UyVmITiYQ http://www.youtube.com/watch?v=v_UyVmITiYQ Or lets say, you want to implement something like this http://doc.trolltech.com/4.6/tools-customcompleter.html http://doc.trolltech.com/4.6/tools-customcompleter.html but in web browser. How would you go about it?