$(document).ready(function() {
  
  // Open external links in new window
  $('a').click(function() {
    var hostname = window.location.hostname;
    hostname = hostname.replace("www.","").toLowerCase();
    var href = this.href.toLowerCase();
    if(href.indexOf("http://")!=-1 && href.indexOf(hostname)==-1) {
      $(this).attr('target', '_blank');
    }
  });
  
});