This is fantastic and mindboggling and as someone who quit web design when CSS came into the picture, I bow down to you for making it so straightforward.
However, I have a question. What if I wanted to set up a link area, say, to the left of my content and have those links change the content in the designated area to the right? Is that possible? Is the only way to do it to recreate the links on the left in every individual [div] tag?