Parse Google Analytics __utmz cookie

parseAnalyticsCookie.js

// inspiration from http://stackoverflow.com/questions/1688657/how-do-i-extract-google-analytics-campaign-data-from-their-cookie-with-javascript
// readCookie is from // http://www.quirksmode.org/js/cookies.html
// utmcsr = utm_source
// utmccn = utm_campaign
// utmcmd = utm_medium
// utmctr = utm_term
// utmcct = utm_content
var parseAnalyticsCookie = function() {

    var values = {};
    var cookie = getCookie("__utmz");
    if (cookie) {
        var z = cookie.split('.');
        if (z.length >= 4) {
            var y = z[4].split('|');
            for (i = 0; i < y.length; i++) {
                var pair = y[i].split("=");
                values[pair[0]] = pair[1];
            }
        }
    }
    return values;
}

/*

More information and examples for each parameter

Campaign Source (utm_source)
---
Required. Use utm_source to identify a search engine, newsletter name, or other source.
Example: utm_source=google

Campaign Medium (utm_medium)
---
Required. Use utm_medium to identify a medium such as email or cost-per- click.
Example: utm_medium=cpc

Campaign Term (utm_term)
---
Used for paid search. Use utm_term to note the keywords for this ad.
Example: utm_term=running+shoes

Campaign Content (utm_content)
---
Used for A/B testing and content-targeted ads. Use utm_content to differentiate ads or links that point to the same URL.
Examples: utm_content=logolink or utm_content=textlink

Campaign Name (utm_campaign)
---
Used for keyword analysis. Use utm_campaign to identify a specific product promotion or strategic campaign.
Example: utm_campaign=spring_sale
*/

you can we set this to hidden fields separately?