Some problems when using swfupload+ftp

Recently i am using swfupload in my web project. What i want to do is to upload files to remote ftp server instead of my local web server.The problem is that when the swfupload progress bar percentage shows my uploading is completed,but the file is only upload to my local web server,not excatlly to the remote ftp server.how can i show the correct percentage in the progress bar.