setting up anon ftp

[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.