Parse Google Analytics parameters as JS variables

ga-js-parameters.js

 var getURLParams = function() {
  var temp = {};
  document.location.search.replace(/\??(?:([^=]+)=([^&]*)&?)/g, function() {
   var decode = function(s) {
    return decodeURIComponent(s.split("+").join(" "));
   };
   temp[decode(arguments[1])] = decode(arguments[2]);
  });
  return temp;
 };
 var $_GET = getURLParams();
 
var utmMedium = getURLParams()["utm_medium"];
var utmSource = getURLParams()["utm_source"];
var utmCampaign = getURLParams()["utm_campaign"];
var utmTerm = getURLParams()["utm_term"]; 
var utmContent = getURLParams()["utm_content"];