This class likely has limited use.  If you have some
static pages that have a predictable pattern like homepage.php,
page1.php, page2.php, etc... You can use this to make links to those
pages.  Just include the following code on each page.
include ("static_page.php");
$a = new Static_page;
$a->getPrevNext();
I imagine that those with imagination can expand these links.  And
feel free to do so.
