Basic URL and .htaccess question

I set up a blog at http://www.mysite.com/wp/ and would now like it to be accessible at http://www.mysite.com/

I changed the Blog address (URL) to http://www.mysite.com in the admin but nothing has changed; the old static site files still load.

The .htaccess in the web root folder is accessible by WordPress; the timestamp updates after I save the admin settings, and it contains the lines

# BEGIN WordPress

# END WordPress

I know I must be leaving out some basic modification but I’m not sure what it is. This codex page (http://codex.ww.wp.xz.cn/Giving_WordPress_Its_Own_Directory) doesn’t quite apply to me since I haven’t actually moved any files. Also, I’m not using pretty permalinks.