Mod Rewrite rule to Zeus Server rule (Codeigniter)

http://www.mysite.com/index.php/controller

http://www.mysite.com/controller

RewriteEngine on
RewriteCond $1 !^(index.php|images|robots.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^[^/]*.html$ index.php

match URL into $ with ^/[^/]*.html$
if matched then set URL = /index.php

map path into SCRATCH:DOCROOT from /

set SCRATCH:ORIG_URL = %{URL}
set SCRATCH:REQUEST_URI = %{URL}

look for file at %{SCRATCH:DOCROOT}%{SCRATCH:REQUEST_URI}
if not exists then look for dir at %{SCRATCH:REQUEST_URI}%{SCRATCH:REQUEST_URI}
if not exists then set URL = /index.php%{SCRATCH:REQUEST_URI}