How can I find out if I have mod_rewrite?

To get information about your server, you can use the phpinfo() function:

Paste this into text editor
<?php phpinfo(); ?>
Save as info.php Upload to server. Visit in your browser (www.example.com/info.php)

The info.php file returns a page outlining the details of your PHP installation. You can see if mod_rewrite is loaded. Under the apache header, look in the Loaded Modules section and see if mod_rewiite is listed.