404 errors

When you paste from some web in IE, it tries to add a reference to any file included in the original page (like your css and js), although they won't be present in the final content.

I would like to see it fixed it but I think that it's impossible from the FCKeditor side.

I meant: those are references in the original page from where the data is being copied. Check the source of that page and you'll see that they match the js and css files that you see in your errors.