Changed the path to wp-login and now can't access WPress dashboard

I’m in desperate need of help. In WordPress under settings, I removed the sub-directory and saved. Now I can’t get back to WordPress or my login page which was http://www.deccan.co.nz/WP/wp-admin/. I’ve tried to amend the wp-login.php page with the below code, but this doesn’t work.

if ( $url != get_option( 'siteurl' ) )
    require( dirname(__WP__) . '/wp-load.php' );    

update_option('siteurl', 'http://www.deccan.co.nz/WP/' );
update_option('home', 'http://www.deccan.co.nz/WP/' )   

Any other ideas?
Thanks in desperation
Felicia