It looks to me like you want to ftp the files, right?
You could try Net::FTP, as liz suggested for your problem. Build some kind of webbased interface which logs on to the server you want to ftp to, or make an ftp dir on the server that users login to and use a cronjob f.i. to move the files, or make it "trigger another script".

You might have to solve some ownership issues and limit the filesize and/or maximum amount of uploads. You could look at some simple uploadscripts and build it based up on that.

Teabag
Sure there's more than one way, but one just needs one anyway - Teabag