Controlling scaleMode to scale/noscale on different object...

[fpr302]

I don't know where to begin...
Basically, I'm interested in figuring out how to do something like this website.

As you can see the navigation doesn't scale, but the image size adjust accordingly to the size of your browser.

So, I want to know...
1. How I need to prepare the images so that I can avoid pixelation
2. How to set the image to scale, but not the navigation.

Does anyone know any good tutorials...?
I found this tutorial, and it gives me some idea... but not quite the same.