Sample not loading in IE 6

After some point I started to get an error in IE when loading the editor:
Line: 20
Char: 94
Error: Unexpected quatifier
Code: 0
URL: http://fckeditor.net/FCKeditor/editor/f ... ar=Default

It happens even with samples on http://www.fckeditor.net. I use IE 6.0 with SP1, what possible could cause such error?