acl from a file

I am trying to use a file as a list of banned sites. It was downloaded from 
{HYPERLINK "http://www.orso.x5.net/sxcontrol.html"}http://www.orso.x5.net/sxcontrol.html

I have included the following two lines in squid/conf
acl denied_destinations dst "/usr/local/squid/etc/deniedsites"

and

http_access deny denied_destinations

The file is saved in that directory as 'deniedsites'.

When I access one of the sites in the list it quite happily provides it! What
have I done wrong?

Cheers,

--
Simon Bryan                    simon@olmc.nsw.edu.au
Information Technology Manager sbryan@mpx.com.au
OLMC Parramatta