Urls and ports: how to use a non-standard ftp port?

[David Bovill]

Whats the syntax to ftp to a non-standard port? Say it's something like:

    put someBinData into 
"ftp://usrName:pssWord@www.opn-technologies.com/sites/tools/test.rev"

But I want it on a port other than 21?

Can anyone help?