fckeditor is very very good but it is more functional than you need. http://www.fckeditor.net visit http://www.htmlarea.com for comparising..
fcteditor is good enough, BUT, you will have to purhase license for your commercial product, here is the one I LOVE, becuase its not only FREE but its with public domain license. thanks to Kevin Roth again and again. here is the demo http://www.kevinroth.com/rte/demo.htm here are download and other details http://www.kevinroth.com/rte/ Thank kevin
We have used TinyMCE for a ton of stuff and it is quite easy and flexible to implement. Give it a try. You'll love it!
I dont recommend having a javascript editor because many users have it disabled. Try finding a flash-based one or just php
I tried installing FCK but had some trouble, if you really want it, you should be able to get it to work.