Dynamic content!

So i’m working on building a site, i want to use iframes (yes i know i probably shouldn’t) but check out the site thus far and you’ll see what i’m talking about

So here’s what i’m looking to do and i’m almost there. i want the links on the right, to load the linked page inside the center column. without having to re-load a new page.
now if there’s a way to do this via DIV tags, then i’m all for it. but what i’ve found thus far, is iframes are the way to go with this. does anyone have any suggestions on how to get this working. that would be great.

ps. feel free to check out the source code to get an idea on how my code looks.