Site made in Flash

Hi guys!
I made a part of a site that I want to make totally in flash.
I got the point where I want to make some changes on my site by clicking some simple buttons. I’ve done all my site using only one .swf movie that contains lots of layers and some tweening animations.

I fallowed this tutorial http://www.kirupa.com/developer/mx/full_site.htm
and I learned that a site in flash must be done using several swf movies.

This is my question:
Can I make my site using only one swf movie?
How can I add some action on my buttons to play some tweenings along my site in order to get the same effect as I would use more swf movies?
What actions should I add on my buttons to play more frames from the last frame that I used when the Home page was loaded?

This is what I’ve done so far: http://cocoalex2.home.ro

What I want is that when you click on Servicii, Portofoliu or Contact that white square to move again and another graphics to appear behind it.

Thanks a lot!