This is an edit !!

I just give http://www.net2ftp.com/ a go . it is an online FTP client. It seems to work great it has flash based uploader or java . I just tested the flash uploader to my ftp server and worked flash and easy i uploaded 5 pics Just fine. very clean site no popups .and seems fast . I think you will find this the easy way to ftp from n8X0 or 770

There maybe others out there but this one is clean.

Computerfreek