I've been looking for some sort of dhtml/javascript solution to this prob, but the closest I've found so far doesn't work on NTL - not because of lack of PHP/Perl/CGI, but just because it relies on something that NTL have blocked.
It seems that they've relented a little, I just checked & I can get a list of files, but not dates or filesizes. I don't see how making that information visible would make the server any more vulnerable to hacking if it's read-only when accessed via http instead of FTP, but at least it's better than nothing.