penders - 9:10 am on Dec 21, 2011 (gmt 0)

You have already applied a unique id to the body of each page. You also need to apply a unique id to each of your links in your nav - since you need to target each link individually in order to style it.

Then you need to provide a style rule for each body/link combo... so that the link-to-page-N when actually on page-N is green.

#pageN #nav li a#linkpageN { 
  color: green; 
}