window.addEvent('domready',function() {
        var links = $(document.body).getElements('a[href^=http:]'); //link start with http != mailto
        links.each(function(el){
        el.addEvent('click', function(e){
                e.stop();
                (this.href.test('/'+window.location.host+'/')) ? window.open(this.href):window.open(this.href, '_blank');
                });
        });
}); // domready