As the page states, this is an IE4+ Script function, not from the ECMA Standard.
http://javascript.about.com/library/weekly/aa091001a.htm states more clearly that it is an IE-only function.
NA's software is either IE-only on purpose or it falsely assumes that Konqueror is IE.
In case you know the software to be working with other non-IE browsers, you could check if setting Konqueror's browser ID to that of the other non-IE browser.
Cheers,
_