Password for different pages

I am looking for a plugin or script for the following. On my webpage I want to have a page with a password field. It has to have multiple passwords to go to different pages. i.e. if your put in password 1 you would be directed to page 1. If you put in password 2 you would be directed to page 2 and so on. And if you put in a wrong password than you will get a message with wrong password.
It’s like the “If – Else” kind of thing and I don’t know if such a plugin exists already or not.

Who can help me out on this?