Load external links in new window / tab

external.js

function set_external_links() {
  $('a[href^=http]').not('a[href^="'+window.location.protocol+'//'+window.location.host+'"]').click(function(e){
    e = window.event || e; if(e.preventDefault) e.preventDefault(); else e.returnValue = false;
    window.open(this.href); return false;
  });
}