Tracking outbound links with Google Analytics

gistfile1.js

< script type = "text/javascript" >

(function($) {
  $(function() {
      $('a[href^="http"]:not([href*="' + document.domain + '"])').click(function(e) {

      // When a user clicks an external link

      if ($(this).attr('target') !== '_blank') {
        e.preventDefault();

        // If the link is not set to target='_blank'
        // set a 300ms delay before loading this page
        // which allows Google Analytics to register the event 

        (function(a) {
          setTimeout(function() {
            document.location = a.attr('href');
          },300)
        })($(this));
      }

      // Track URL and nearest element with an ID
      // and send to Google Analytics

      window.pageTracker ? pageTracker._trackEvent('Outbound', $(this).attr('href'), "#" + $(this).closest('[id!=""]').attr('id')) : _gaq.push(['_trackEvent', 'Outbound', $(this).attr('href'), "#" + $(this).closest('[id!=""]').attr('id')]);
     });
   })
})(jQuery)

< /script>

This will redirect a user clicking with the middle button and expecting the link to be opened in a new tab/window.

The line
if ($(this).attr('target') !== '_blank') {

should be:
if ($(this).attr('target') !== '_blank' || e.which != 2) {