To improve search engine hits (SEO) it is a good practice to use a single domain name for your site for example www.somedomain.com is actually a different domain to somedomain.com as is somedomain.com.au.
As below you can use mod_rewrite in the .htaccess file to redirect incoming requests to the parent site
# mod_rewrite in use
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.paladinit.com.au$ [NC]
RewriteRule ^(.*)$ http://paladinit.com.au/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^www.paladinit.com$ [NC]
RewriteRule ^(.*)$ http://paladinit.com.au/$1 [R=301,L]
END
