mixpanel ephemeral event handler

<script type="text/javascript">
var mpq = [];
mpq.push(["init", "1c8c35d989982401990706fce6659790"]);
(function(){var b,a,e,d,c;b=document.createElement("script");b.type="text/javascript";b.async=true;b.src=(document.location.protocol==="https:"?"https:":"http:")+"//api.mixpanel.com/site_media/js/api/mixpanel.js";a=document.getElementsByTagName("script")[0];a.parentNode.insertBefore(b,a);e=function(f){return function(){mpq.push([f].concat(Array.prototype.slice.call(arguments,0)))}};d=["init","track","track_links","track_forms","register","register_once","identify","name_tag","set_config"];for(c=0;c<d.length;c++){mpq[d[c]]=e(d[c])}})();
</script>

<script type="text/javascript">
var MixPanelHelp = function() {
  return {
    // augments an event with basic info such as current user
    // then fires the event off
    track : function(eventName, moreProperties, callback) {
        var properties = new Array();
        if (typeof optionalArg != "undefined"){
          properties = $.extend(moreProperties);
        }
        properties["url"] = document.URL;
        // add in the current user if there is one
        if(current_user){
          properties["username"] = current_user.hash.username;
          properties["gender"] = current_user.hash.gender;
          properties["zipcode"] = current_user.hash.zipcode;
        }
        // make the callback
        if (typeof callback == "undefined"){
          mpq.track(eventName,properties);
        }else{
          mpq.track(eventName,properties, callback);
        }
    },
    // fires our track wrapper, protected by a delay
    delayed_track : function(eventName, moreProperties, callback){
      var t = window.setTimeout(callback,300); 
      MixPanelHelp.track(eventName,moreProperties);
      // make the callback
      if (typeof callback == "undefined"){
        mpq.track(eventName,properties);
      }else{
        mpq.track(eventName,properties, callback);
      }
    }
  };
}();

$(function() {

    // MixPanelHelp ephemeral link tracker
    // Used on links that would otherwise
    // not give the event enough time to fire.
    // NOTE: Requires data-trackname to be set
    // ex: <a href="google.com" class="track_link", data-trackname="to Google">go to google</a>
    $('.track_link').click(function(e) {
      e.preventDefault();
      var href = $(this).attr('href');
      var t = window.setTimeout("window.location = href",300);
      MixPanelHelp.track($(this).data("trackname"),"",function(){
        window.clearTimeout(t);
        window.location = href;
      });
    });

    // MixPanelHelp ephemeral button tracker
    // Used on buttons that would otherwise
    // not give the event enough time to fire
    // (Such as form submission buttons)
    // NOTE: Requires data-trackname to be set
    $('.track_button').click(function(e) {
      e.preventDefault();
      var form = $(this).parents("form")[0];
      var t = window.setTimeout("form.submit()",300);
      MixPanelHelp.track($(this).data("trackname"),"",function(){
        window.clearTimeout(t);
        form.submit();
      });
    });
});



</script>