Misnamed body class and array index

Issue Summary

1. layout.css uses the "with-navigation" body class to attempt to position the three columns below the navigation bar. It doesn't work because the page is output with the "with-subnav" class instead.
2. page.tpl.php attempts to access the "highlight" index of an array. This produces an error because the index was renamed to "highlighted" per http://drupal.org/node/870100 .