outbound_link_handler.js

(function() {

  jQuery("a").filter( function(i, el) {
    var startOfUrl = location.protocol + "//" + location.hostname;
    var target = el.href.indexOf( startOfUrl ) === 0;
    if ( target === false ) {
      jQuery(this).on( "click", function(e) {
        e.preventDefault();
        window.open( jQuery(this).attr("href"), "_blank" );
      });
    }
  });

}).call(this);