Best way of doing multi page side?

I meant site of cource…

Hi there, I’m working on pretty simple web side that cointains login screen (almost same as in demo presentation, white page with login and password) and main screen with sidebar and navigation bar. How should it be done? My plan is to build main screen using navigation bar, sidebar (just few buttons in layout basicly) and few layouts with content of the webside. On each button click change layout used to create content to another one, for example for Schudele button I’m gonna load layout that contains some tables, for About button plain text. Is it good idea?

So finnaly is should look like this:
init() function decides if user is logged or not and display Login page or Main page, Main Page is builded from modules like navbar, sidebar and content, content depends on sidebar buttons click. I’m right?