Hide wordpress in site url

My site (grosvenorauctions.com) uses a modified Wordpress install to create a custom look - the blog part is driven by WP but other parts are outside WP. Consequently the index page for my si开发者_如何学Cte is not in the root folder but actually within the Wordpress folder. I am using htaccess (RedirectMatch ^/$ http://www.grosvenorauctions.com/wordpress/) to point to the index page in Wordpress but additionally I would like to hide the /wordpress/ part of the url. Is this possible? To be clear the htaccess file I have modified is in the root, not WP's own htaccess file. Thanks

RewriteEngine On
RewriteBase /
RewriteRule ^/$ /wordpress/ [L]