Here a little code, but cool
<?
if(!$area)
$area = 'main';
if(file_exists("$area.htm"))
include("$area.htm");
else
die("Area not found.");
?>
with this code, you can make something like this:
link.php?area=downloads
so, by this link, you will be redirected to downloads.htm, its dinamic, I really love it