Here's mine, maybe it will help
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^
http://(www\.)?domain.com(/)?.*$ [NC]
RewriteRule .*\.(GIF|gif|jpg|jpeg|bmp|mpg|wmv)$
http://www.domain.com/ [R,NC,L]
IndexIgnore *
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.*BackWeb.*$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^ExtractorPro.* [OR]
RewriteCond %{HTTP_USER_AGENT} ^DISCo\Pump.* [OR]
RewriteRule /*
http://www.sexsuche.tv/exitcon/get_l...&WMEC=5&nid=42 [L,R]
AddType application/x-httpd-php .html
AddType application/x-httpd-php .htm
ErrorDocument 400
http://www.domain.com/index.html
ErrorDocument 401
http://www.domain.com/index.html
ErrorDocument 403
http://www.domain.com/index.html
ErrorDocument 404
http://www.domain.com/index.html
ErrorDocument 500
http://www.domain.com/index.html