Block referer or referrer

Hi
I need to be able to prevent certain web pages from calling scripts on my
server.  I don't have access to modifying the script so I must block by
other means.  I have set up the following in httpd.conf:

<VirtualHost *>
*******  SetEnvIfNoCase Referer ^701 bad_guys=Remote_Host
  ServerName www.somethingcom
  ServerAlias something.com
  DocumentRoot /home/something/www.something.com/
  CustomLog /home/something/logs/www.something.com.log combined
  <Directory "/home/something/www.something.com/cgi-bin">
    AllowOverride All
    Options None ExecCGI
    AddHandler cgi-script .cgi .pl
    Order allow,deny
    Allow from all
******** Deny from env=bad_guys
  </Directory>
</VirtualHost>

where the referrer I am trying block is contains 701, something like
http://701.domain.com/callingpage.html.  This didn't prevent the access.

Q: What am I doing wrong?
Q: If I need to block other web pages from calling this script, can I add a
block of SetEnvIfNoCase statements?
Q: While investigating it seems that there are Perl modules I can install
that will redirect instead of blocking.  I didn't follow this path because
it seemed less elegant (and out of fear, as I haven't done anything like
that before).  Should I instead be looking into this area further?

Any thoughts are appreciated - and could I ask for a cc as I am on digest?

Thank you,

Glenn

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