the way descibed here (http://www.zkoss.org/smalltalks/fckupload/fckupload.dsp) to make fckeditor upload possible is not working with recent versions. tested with 3.0.7, 3.5.0 and 3.5.1 FL 10-03 .
this is also reported here: http://zkoss.org/forum/index.zul#path=listComment;discussionId=5705;categoryId=14;
thx for fixing this or updating the small-talk on how to get it working again!
i just investigated the bug a little bit. in version 2.3-3 of fckeditor upload is working and the servlets are called. this is not happening with later versions. so I guess the bug must be lying somewhere in the js part.