using redirect for outgoing links

Please can I get some help with this:

1. Setting up so that all external links use mywebsite.com/out?= or similar for all outgoing URLS by default.

2. Also, that page should take the user to a 'redirecting you page' and then onto the destination.

Thanks!

example:
mywebsite.com/out?=http://www.google.com

This has to be the "index.php" file in your case, because you didn't specify any file ...

<?php
// default in case they don't enter any URL
$out="index.php";

// get URL variable
if($_GET['out']){
$out=$_GET['out'];
}

// redirect
header ("location: $out");
?>