You can use a basic cookie script to keep visitors (that don't have the cookie on their system) from viewing certain parts of your site (kind of.... There are always ways around it). The cookie is placed when the password provided is correct. Then, when they are forwarded to the password protected page, the cookie allows them to stay. Those without the cookie are sent back.

Let a JavaScript cookie remember your favorite background color. On the first visit, it prompts for your favorite background color and change it to your choice. On future visits, it automatically displays that background color for you.

This cookie allows you to record and store the visitor's name on the visitors computer and to later retrieve that information.

Using a cookie This JavaScript allows you to remember how many times a user has visited a page.

This cookie records how many times the visitor has visited the page and writes to the page accordingly. (ie: You have been here 2 times).

Cross-platform JavaScript utility class for creating, reading, and deleting cookies. Cookies can be either session or persistent. Has ability to apply unlimited sub-values to a cookie. This allows you to work within the confines of the 20 cookie per server limit.

This script remembers the last time a user visited your Web page within last 30 days. A cookie is used to record the time of a visit.