This plugin is most useful when you have your blog under a Web site whose pages use different WordPress functions that
requires you to have logged in.
For example, you’d like to use the
wp_loginout(); function to display the login link whenever you are logged out and
the logout link otherwise on all pages of your site, but WordPress is installed under
/wp/ where your blog also
resides. Therefore, WordPress creates cookies under the
/wp/ directory only, making you seem logged out on the
directories above the WordPress directory. This plugin will make WordPress create cookies on the root directory of your
domain to eliminate the problem.
Free Download: Download this wp-plugin