Untitled

<?php
$mydomain = 'yourdomain.com';
$host = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);

$url = $_GET['url'];
if ($host==$mydomain || isset($_GET['step']) && $_GET['step']==2) {//if using site directly, or already 2nd step
	$redirectUrl = $url;//referer is OK, go to real url
}
else {//1st step. redirect to 2nd step to change referer
	$redirectUrl = "?".http_build_query(array('step'=>2) + $_GET);
}
?>
<html>
<head>
<!-- HTTP redirect in 3 seconds, in case javascript does not work -->
<meta http-equiv="refresh" content="3;url=<?=$redirectUrl?>" />
</head>
<script type="text/javascript">
function openUrl(url)
{
    var fakeLink = document.createElement('a');

    // Firefox & other browsers
    if (typeof(fakeLink.click) == 'undefined')
    {
        location.href = url;
    }
    // Internet Explorer
    else
    {
        fakeLink.href = url;
        document.body.appendChild(fakeLink);
        fakeLink.click();
    }

    return true;
}
//javascript redirect in 100 ms.
setTimeout(function(){openUrl("<?=$redirectUrl?>");}, 100);
</script>
<body>
<center>
	Redirecting...
</center>
</body>
</html>