I've checked Stackoverflow and found this question/discussion: https://stackoverflow.com/questions/98852/wysiwyg-text-editor-for-webpage
Important:
However, I'm looking for something that comes with special "administration panel" -> So it behaves more like CMS (in backend mode).
I'm rewriting other's programmer code which is pretty much uncommented (He'll burn in Hell for That), and I need something very simple, so I install some backend onto hosting, plus add function or include to code and place the text-specific codes into website code.
Thanks' soo much for your answers.
Edit: PHP and MySQL required.
The FCKeditor should work with PHP, and it's a solid WYSIWYG editor.
http://www.fckeditor.net/
The YUI Rich Text Editor could also work.
TinyMCE is very clean, and configurable, but it's extremely difficult Javascript code to penetrate (Firebug is useless against it) while there are quite a few bugs.
wyzz is also an lightweight editor, and its code more readable. If you are looking for simplicity.
I just started with WYZZ 0.65 on IE8 and it looks pretty good. I like how you can insert images and also tell it how to align the image.
Only possible bug I found so far was that the 'insert special character' function inserts the character outside the text area.
http://www.wyzz.info/
Installed Wyzz Editor, it's nice and clean. Tested in Localhost, in Windows XP SP2, using Firefox 14.0.1. But till there are some difficulty: image insertion is not easy for novice, you have to upload an image to a directory, then you have to copy-paste the link into it. It's not easy for someone novice with IT. In my test cut-copy-paste isn't working.
Ok, bugs have, bugs will be. But you can test it. It's clean and light-weight. Thanks.