Tutorial: Encripta tus enlaces salientes (Tipo Yaske o SeriesFLV)

<div id="info">
<a href="http://forobeta.com/">Enlace 1</a>
<a href="http://facebook.com/">Enlace 2</a>
<a href="http://twitter.com/">Enlace 3</a>
<a href="http://youtube.com/">Enlace 4</a>
<a href="http://localhost/pruebas">Enlace 5 (ésta en nuestro host, ésto no debe cambiar a base64)</a>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="jquery.base64.min.js"></script>
<script src="wjharil.js"></script>

(function(e) {    
    e.Postbitch = function(t, n, r) {
        var i = e("<form>", {
            action: t,
            method: "post",
            target: r,
            enctype: "multipart/form-data"
        });
        this.each(n, function(t, n) {
            e("<input>", {
                type: "hidden",
                name: t,
                value: n
            }).appendTo(i)
        });
        i.on("submit", function() {
            e(this).remove()
        }).appendTo("body").get(0).submit()
    }
})(jQuery);

function nombre_dominio(url) {
    var m = url.match(/^http:\/\/[^/]+/);
    return m ? m[0] : null;
}

$(function() {
    
    $("#info a").each(function() {
        link_ = $(this).attr('href');
        if(window.location.origin  != nombre_dominio(link_)){
            codificar_64 = $.base64.encode($(this).attr('href'));
            $(this).attr('data-url',codificar_64);
            $(this).attr('href','go-to.php');
            $(this).on("click", function(e) {            
            e.preventDefault(); // cancelo todo
            var t = $(this);
            $.Postbitch(this.href, {
                url: t.data("url")
            }, this.target);
            return false;
            });
        }        
    });
});

<?php 
if($_POST['url']):
$url  = $_POST['url'];
$url = base64_decode($url);
?>
<meta http-equiv="refresh" content="5;url=<?php echo $url;?>"> 
Espera 5 segundos, est&aacute;s siendo redirigido.
<?php endif;?>

function utf8_to_b64( str ) {
  return window.btoa(unescape(encodeURIComponent( str )));
}

function b64_to_utf8( str ) {
  return decodeURIComponent(escape(window.atob( str )));
}

    var linkEls=document.querySelectorAll('#info a');
    for (var i = 0, l = linkEls.length; i < l; i++) {
        linkEls[i].addEventListener('click', function(e) {
           var formdata = false;
           formdata.append("url", utf8_to_b64( e.target.href));
           var xhr = new XMLHttpRequest();
           xhr.open('POST','go-to.php');
           xhr.onload = onLoadHandler;
           xhr.send(formdata);
           var onLoadHandler = function(e){
               alert(e.target.responseText);
           };
           e.target.preventDefault();
        }, false);
    }