hi.i need some help :

how can i make the background image to autoresize according to the screen resolution of the monitor from where the page is seen?same with the banner and the rest of the images.i basically want my website to look exactly like in the picture no matter what is the resolution of the screen and without a scroll bar.
and another thing:
how can i make to load only the text on the orangebox when i click a side link(e.g:assus) without refreshing the hole page.and how can i put a scroll only on the orange box so i can put a longer text and not to exit from that rectangular space?

thank you