JS: Google Analytics Helper

gistfile1.js

/**
  * Analytics Helper
  * 
  * Include this script at the bottom of the body when you want to enable tracking outbound links.  
  *
  * To enable outbound tracking, simply add rel="external" to your anchor.
  *
  * To enable event tracking, add rel="trackevent" to your anchor, then use the fragment
  * identifier in the href to set your event params. An example href would look like: 
  * href="#te_category=Downloads&te_action=PDF&te_label=Document&te_value=Value"
  *
  * This script will only work with the asynchronous analytics setup 
  * (http://code.google.com/apis/analytics/docs/tracking/asyncTracking.html).
  *
  * You will also need to make sure the analytics _gaq is already setup with account information
  * and other required options.
  */
(function(global) {
  var OUTBOUND_EVENT_CATEGORY = 'Outbound Links',
    TRACK_EVENT_DEFAULT_CATEGORY = 'Default Category',
    TRACK_EVENT_DEFAULT_ACTION = 'Default Action';
  
  var _gaq = global._gaq || (global._gaq = [])
    reExternal = /\s?external\s?/i,
    reTrackEvent = /\s?trackevent\s?/i;

  function handleClick(e) {
    // fix our event when needed
    e || (e = global.event);
    
    var target = e.target || e.srcElement, action, i = -1, param, params = {};
    
    // if there isn't a target for some reason, return
    if (!target) {
      return true;
    }

    // handle outbound links via rel="external"
    if (reExternal.test(target.rel)) {
      action = target.href || '';
      action = action.replace(/^(https?:\/\/)?(www\.)?/i, '');
      _gaq.push(['_trackEvent', OUTBOUND_EVENT_CATEGORY, action]);
    }
    
    // handle event tracking via rel="trackevent"
    if (reTrackEvent.test(target.rel)) {
      action = String(target.href || '');
      // pull out our hash from the href
      action = action.match(/#(.*?)(?=\?|$)/);
      
      // if nothing matched or it didn't match more than 1, then return;
      if (!action || !action.length > 1 ) { return true; }
      
      // split the hash on &'s and loop through to build params object
      action = action[1].split('&');     
      while (param = action[++i]) {
        param = param.split('=');
        params[param[0].replace('te_', '')] = decodeURIComponent(param[1]);
      }
      
      // build our command and push it to the gaq
      _gaq.push([
        '_trackEvent', 
        params.category || TRACK_EVENT_DEFAULT_CATEGORY, 
        params.action || TRACK_EVENT_DEFAULT_ACTION,
        params.label,
        params.value
      ]);
      
      // DISCLAIMER: Because we don't want to show the tracking hash in the URL, we are removing
      // our tracking parameters from the hash and then setting the window.location to that value.
      // We are only preventing default here, which means bubbling and other handler propagation
      // should continue.
      window.location = target.href.replace(/\&?te_(.*?)\&?(?=\?|$)/, '');
      e.preventDefault && e.preventDefault();
      e.returnValue && (e.returnValue = false);
      return false;
    }    
  }
  
  if (document.addEventListener) {
    document.body.addEventListener('click', handleClick, false);
  } else if (document.attachEvent) {
    document.body.attachEvent('onclick', handleClick);
  } else {
    document.body.onclick = handleClick;
  }
})(this);

gistfile2.html

<a href="http://twitter.com/github" rel="external" title="Twitter: @github">Twitter: @github</a>
<a href="http://www.facebook.com/MLBFans" rel="external" title="Facebook: MLBFans">Facebook: MLBFans</a>

<a href="#player&te_category=Videos&te_action=Play&te_label=Zoolander" rel="trackevent nofollow">Play Zoolander</a>
<a href="#player&te_category=Videos&te_action=Stop&te_label=Zoolander" rel="trackevent nofollow">Stop Zoolander</a>
  
<a href="document.pdf#te_category=Downloads&te_action=PDF&te_label=Document" rel="trackevent">Download PDF</a>