HTACCESS file

[eluser]gandalf12[/eluser]
Hi ya

I have loaded a sample application on my website http://www.greenwitch.xtreemhost.com/codeigniter

problem is I think my .htaccess file is incorrect, here is what it looks like:

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

also, does the chmod code matter?? I think I have chmod'd 775 to all files!!

Thanks for any assistance

Grant