FTP over HTTP

I am currently using SmartFTP version 1.0 and I would like to know the best or perferred Proxy "Type" configuration when going through (using) a proxy server such as a Squid or Blue Coat appliance. In addition, the proxy server also has proxy authentication enabled.

I have tried all the "user@fireid...", "proxy tunnel", and "user hosts proxy " type attributes with HTTP proxy connection over port 80 and 8080, but none seem to work.

Please advise and your suggestion and feeback is greatly appreciated.
-Q