.htaccess

[eluser]nmweb[/eluser]
In your CI directory (so where the index.php is situated) you place a file named .htaccess with these contents:

<code>
RewriteEngine On

RewriteBase /{your CI directory}/

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
</code>

That's it. http://httpd.apache.org/docs/1.3/mod/mod_rewrite.html for an explanation.