// Parse the 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, " "));
}

// Give the URL parameters variable names
var source = 'organic';
var medium = 'organic';
var campaign = 'organic';

// Give the URL parameters variable names
var source = getParameterByName('utm_source');
var medium = getParameterByName('utm_medium');
var campaign = getParameterByName('utm_campaign');