Redirect based on request.

So here is my story. I have one host, and many websites. So I need a redirect based on the request. Currently if someone types in some of my websites, such as comptutes.com or xboxachieve.com, they will both go to the exact same page (index.html).

I need a redirect that says, if the person typed in xboxachieve.com, they will be redirected to "xboxachieve.com/x/index.html". Likewise, if someone types in comptutes.com, they should get "comptutes.com/c/index.html", etc..

Many thanks in advance.

re: Redirect based on request.

a javascript way:
a PHP way:
[php]
<?php
header("Location: http://yoursite.com/directory/index.html");
?>
[/php]
hope this helps :)