Aarrrrgghhhhhhhhhhhhhhhhh

//1. get q from the url

$q = $_REQUEST['q'];

//2. use an array or switch statement to get the filename to include

//a) for this example, here's an array
$files = array('home'=>'index.inc.php', 'about'=>'about.inc.php', 'contact'=>'contact.inc.php');

//b) check that $q is valid, and set it to a default if not:
if( !isset($files[$q]) ) $q = 'home';

//c) get the file to include

$include_me = $files[$q];

//3. Start output buffering

ob_start();

//4. include the file associated with the contents of q
// => php in file is automatically parsed when you include it

include($include_me);

//5. Get the contents of the output buffer

$content = ob_get_contents();

//6. erase the content of the output buffer (so it doesn't get output to the browser)

ob_end_clean();

//7. do whatever else you need to do...

//8. use str_replace, ereg_replace or preg_replace to replace {content} in your template with whatever is now in the $content variable

//9. echo the output when you want it.