RewriteEngine on
RewriteCond %{HTTP_HOST} ^(www.)?ilksite.com$
RewriteCond %{REQUEST_URI} !^http://ikincisite.com
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ http://ikincisite.com/$1 [L,NC]