Which version to use for PHP and 'AJAX'?

As you only want the editor if the user clicks the 'Comment' button and of course you dont want to reload the page when they do... surely its obvious that you should create the editor instance with JS?

I guess it would be something like this:

You'd have a textarea on the page where you want the editor to appear with display: none.
You have a JS function:

function makeEditor() {
var oFCKeditor = new FCKeditor( 'MyTextarea' ) ;
oFCKeditor.BasePath = "/fckeditor/" ;
oFCKeditor.ReplaceTextarea() ;
}

Your button: <button onclick="makeEditor()" value="Comment">
When they click it, the editor appears.
You'd want another button that is also only visible at the same time as the editor that calls your function which submits the content of the editor... something like this:

function submitComment() {
   var ed = FCKeditorAPI.GetInstance('MyTextarea') ;
   httpRequest = getHTTPObject(); //deffined elsewhere
   var postdata = '&content='+ed.GetXHTML.str.replace(/&/g, '%26')+'x=y';
   httpRequest.open('POST', url, true);
   httpRequest.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
   httpRequest.setRequestHeader('Content-length', postdata.length);
   httpRequest.onreadystatechange = function() { submitResponse(httpRequest); }; //Where submitResponse is a funtion that would inform the user their comment was recieved by the server.
   httpRequest.send(postdata);
}

BTW.. I am no expert.. just started playing about with FCKeditor yesterday.

HI I have battled with the same problem for weeks now. Finally the solution is there. You need to apply these lines of code to your submit function,

http://blogs.uct.ac.za/blog/lovemores-world/2008/10/27/post-fckeditor-form-with-ajax-solved

Log any more problems on my blog so that I can help you quickly.

Happy coding!