FTP server will not initiate DATA connection back to client

[RYAN vAN GINNEKEN]

I am tring to setup anon ftp on my bsd box and followed the directions 
layed out on this web page
http://www.freebsddiary.org/ftp-anonymous.php but to no avial.  The anon 
user should be able to browse the dirctories and upload files to 
incoming but not be able to downlaod or erase files from the incoming 
directory.  My problem is that the anon user can download files from the 
incoming directory and i have already had script kiddies up and down 
loading files can someone please help.