utmSessionStorage.js

<script type="text/javascript">

// pulls the value out of the parameter from a URL
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

try{ 
// sets all of the UTM parameter
  var utmSource = getParameterByName('utm_source');
  var utmMedium = getParameterByName('utm_medium');
  var utmCampaign = getParameterByName('utm_campaign');
  var utmContent = getParameterByName('utm_content');
  var utmTerm = getParameterByName('utm_term');
  
  if (utmSource) sessionStorage.setItem("utm_source", utmSource);
  if (utmMedium) sessionStorage.setItem("utm_medium", utmMedium);
  if (utmCampaign) sessionStorage.setItem("utm_campaign", utmCampaign);      
  if (utmContent) sessionStorage.setItem("utm_content", utmContent);      
  if (utmTerm) sessionStorage.setItem("utm_term", utmTerm);
}
catch (e) {}	
</script>