Redirect to stop google picking up old /wordpress/ pages

Hi.

I wonder if anybody could offer some advice. I started building the wordpress address and blog address both as domain.com/wordpress but we decided to move it so everything sat in the root folder ie. domain.com/.

This is all fine but it seems as wordpress and google seem to work so well together, google started to index the site with the old pages. We now have the problem of when you search on the google for our site for example, it brings up domain.com/wordpress. I was thinking about a possible redirect or something in the .htaccess file but when I tried this it messed up.

Does anybody have any thoughts?

Thanks

Ben