You can easily build it using htm pages but you will restrict yourself later for use with dynamic content. Use home.php, etc.
<?php
$s = $_REQUEST["s"];
if (!isset($s)) { $s = "Home"; }
if (file_exists("$s.php")) {
$loadpage = @include("$s.php");
if (!$loadpage) echo "Failed to load page";
} else {
echo "Sorry, the requested page is not available";
}
?>
If using htm or html pages, just replace the .php above with .htm or .html