ftp conection..

Hello, I am creating a script which conects to a ftp server and downloads several files via fsockopen. So far, I have managed to log in, change directories and change type. But whenever I try to throw a "list" comand or use "retr filename" I get 425 Can't build data connection: Connection refused. I belive that I have to throw a PORT comand but I am not sure how to use it. Any thoughts? Please reply to my email since I cannot handle the trafic on this list. Thanks MJI