PHP код:
$Do = $_SERVER['SERVER_NAME'];
$Page = $_GET['do'];
if( file_exists('http://'.$Do.'/do/'.$Page.'.do') ){
echo 'LOL';
}
$Do = $_SERVER['SERVER_NAME'];
$Page = $_GET['do'];
if( file_exists('http://'.$Do.'/do/'.$Page.'.do') ){
echo 'LOL';
}