it would be there just for one purpose : protecting the admin page from "unwanted" people.
What should be in it ?
Login Field
Password Field
-> using Sessions
nothing more than that... ok that sounds pretty easy does it ? Believe me its not. Its alot work to figure out how you are able to make such a page...
If you want to do it, contact me per xfire and i will tell you the stuff that you need to know about the otherpages and the database. But you would have to figure out how to create a login page yourself.