Query Strings reload

I have just completed a new design for a site of mine, and Im using php query strings in it, but since the layout is full of images and takes a while to load each time the user clicks a nav link, the whole layout reloads so it takes a while for modem users to get around the site!

So is there anyway that the content can appear without the whole layout refreshing?

I have thought of using iframes, but the scrollbars will appear and the content will only goes as far as the height allows it and if I higher the height there will be a big blank where the content doesn’t fill up that area!

Sorry it’s hard to understand - you can view the site at http://v2.ihabbo.com/third.php

Click on the screenshots link to see what happens,
Thanks in advance!