[RESOLVED] Remove www from URLS

[NTICompass]

I want to remove the www from the beginning of my URLS. My website is at http://www.nticompassinc.com

http://www.nticompassinc.com/info.php works, but if I enter http://nticompassinc.com/info.php it redirects to http://www.nticompassinc.com

Why does this happen?

My DNS A (NAME) settings have @ and www both pointing to my webserver's IP.

Here is my .htaccess file

Options -Indexes

RewriteEngine On
RewriteBase /

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