ckfinder.html in a popup

Take a look at the _samples/js/popup.html for a pupup example.

I have the same problem. The FCK Editor is installed on a local server and the CKFinder is installed on a different server.
It works standalone but if I try to load CKFinder in a popup there is just a blank page.

This happens due to browser security restrictions. You should install FCKeditor and CKFinder under the same domain if you want to use them together.