config does already - not mod request
!eregi(BANNED,$regs[2]) work for ban keywords
learn regex - use FORBIDDEN_EXTENSIONS
PHP Code:
// no cgi
define('FORBIDDEN_EXTENSIONS','\.(cgi|php|asp|pl|rm|ico|cab|swf|css|gz|z|tar|zip|tgz|msi|arj|zoo|rar|r[0-9]+|exe|bin|pkg|rpm|deb|bz2)');
// no guestbook
define('FORBIDDEN_EXTENSIONS','(guestbook|\.(cgi|php|asp|pl|rm|ico|cab|swf|css|gz|z|tar|zip|tgz|msi|arj|zoo|rar|r[0-9]+|exe|bin|pkg|rpm|deb|bz2)$)');
pick one - take out space - delete guestbook links from admin update - index - not hard