This is the home page of this very small web site.
This page is calling the PHP file navigation.php using
code <?php @include("navigation.php"); ?>. The @ hides any
PHP error message that may occur, so that if any error occurs, the people visiting
your web site won’t have to see it.
Because this page is called home.php, the PHP code has added the
class="currentnav" attribute to the navigation list element that holds
this link. View the page source and have take a look.