First of all any CGI script can send their header as text/html, so those password protection scripts would proably work (if you didn't understand that have a look at Ovid's Web Programming Course, esp. lesson 3 which is a good introduction to web security). Also, have you tried Super Search searching for passwords and CGI, it gives a huge amount of nodes (Website login/authentication, perl web store, and perl web store just to name the first 3)