<script>
// Parse the URL to get the required field values

function getUtmParamByName(utmname) {

utmname = utmname.replace(/[[]/, "\[").replace(/[]]/, "\]");

var regex = new RegExp("[\?&]" + name + "=([^&#]*)"),

    results = regex.exec(location.search);

return results === null ? "" : decodeURIComponent(results[1].replace(/+/g, " "));

}
// Give the URL parameters variable names
var source = getUtmParamByName('utm_source');
var medium = getUtmParamByName('utm_medium');
var campaign = getUtmParamByName('utm_campaign');
var content = getUtmParamByName('utm_content');
var term = getUtmParamByName('utm_term');
// Put the variable names into the hidden fields in the form.
$( document ).ready(function() {
 $('#form-field-utm_source').val(source);
 $('#form-field-utm_medium').val(medium);
 $('#form-field-utm_campaign').val(campaign);
 $('#form-field-utm_content').val(content);
 $('#form-field-utm_term').val(term);
}
</script>