gistfile1.js

document.cookie.split(';').each(function(cookie) {
	if(cookie.indexOf('__utmz') != '-1') utmz = cookie;
});

var cpc_regex = new RegExp(".*?utmcmd=([a-z]+)\|");
medium = utmz.match(cpc_regex)[1];

var gclid_regex = new RegExp(".*?utmgclid=([\_0-9A-Za-z]+)\|");
adwords = utmz.match(gclid_regex)[1];

if(medium == 'cpc' || adwords) firstTracker._setVar('CPC');