WordPress

Hi I have recently created a wordpress site..Roplay

The site was developed in a subfolder of site root called dev..I made site live by creating an index.php file that linked to correct files (something I picked up from this forum)..

The code looked liked this:

<?php
/* Short and sweet */
define('WP_USE_THEMES', true);
require('./blog/wp-blog-header.php');
?>

I went to change another setting to so that admin could be accessed from http://www.roplay.com.au/wp-admin instead of an IP address

It was the setting above WordPress Blog Address that I chnaged to http://www.roplay.com.au..

And now all of my files for admin and front end for site are broken..
I need to desperately restore what was there as site is live..Is there a file i can update/revert to what was in place originally..Help very much welcome.