I am having problems running my htaccess script to block site grabbing programs. It runs on a linux server and blocks all browsers for some reason... here is an abreviated version of it and any help gratefully received!

errordocument 403 http://www.simonides.org/index.htm
errordocument 404 http://www.simonides.org/index.htm
errordocument 500 http://www.simonides.org/index.htm

(all 'Document Not Found' and other errors get redirected to my own error page.)

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.*Ants.*$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^.*attach.*$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BackWeb.*$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Bandit.*$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BlackWidow.*$ [OR]

RewriteCond %{HTTP_USER_AGENT} ^.*Zeus.*$
RewriteRule ^.*$ http://www.use_a_normal_browser_to_v...es_please.com/ [L]