$(function() {
  // Open content external links in a new window
  var links = $("#content a[@href^='http://']");
  links = jQuery.grep(links, filter_internal_links);
  $(links).attr("target", "_blank");

  // Highlight main navigation
  var nav_id = $("body").attr("class").match(/nav-([a-zA-Z0-9\-]+)/)[1];
  $("#nav-" + nav_id).addClass("active");
});

function filter_internal_links(link, index) {
  re = new RegExp("^http://" + window.location.hostname);
  return link.toString().search(re);
}