my browser window does not prompt me for user ID and password

If the Web page requires authentication, use the appropriate method:
Internet Explorer 4.0 or 4.01:

• In Internet Explorer, click Options on the View menu.
• Click the Security tab, and then click Internet Zone in the Zone box.
• Click Custom (For Expert Users), and then click Settings.
• Under User Authentication, click "Prompt for user name and password," click OK, and then click OK again.

Internet Explorer 5:

• In Internet Explorer, click Options on the View menu.
• Click the Security tab, and then click Internet in the Zone box.
• Click Custom Level.
• Under User Authentication, click "Prompt for user name and password," click OK, and then click OK again.