Mine

// Fuse Setup
$fuse = empty($_GET['fuse'])?$conf_fuse:$_GET['fuse'];
$page = empty($_GET['page'])?"index":$_GET['page'];

// Fuse Checks
if(!is_file("fuse/".$fuse."/config.php")) { die("There is no config file for the fuse ".$fuse."."); }
if(!is_file("fuse/".$fuse."/".$page.".php")) { die("There is no page for the fuse ".$fuse."."); }

// Include Fuse
include("fuse/".$fuse."/config.php");
$fuse = include("fuse/".$fuse."/".$page.".php");

// Load Fuse Template and Output
$template->load("templates/".$conf_theme."/index.tpl");
$template->replace("title", "Template Test");
$template->replace("content", $fuse);
$template->output();