<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule . /index.php [L]
RewriteRule ^(.*)favicon.ico - [L]
RewriteRule ^(.*)/ajax.php$ ajax.php [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+) index.php/$1 [L]
</IfModule>

if ($permalinkkeycount != $varscount) 
        {
            array_splice($args['vars'], $permalinkkeys['%category%'],  $varscount - $permalinkkeycount);
        }