/// this bit is extracting the URL parameters
function getParams() {
var idx = document.URL.indexOf('?');
var params = new Array();
if (idx != -1) {
var pairs = document.URL.substring(idx+1, document.URL.length).split('&');
for (var i=0; i<pairs.length; i++) {
nameVal = pairs[i].split('=');
params[nameVal[0]] = nameVal[1];
   }
}
return params;
}
params = getParams();

/// the parsed parameters are then written to a cookie
var expdate = new Date ();
var utmsource = unescape(params["utm_source"]);
var utmmed = unescape(params["utm_medium"]);
var utmcont = unescape(params["utm_content"]);
var utmcamp = unescape(params["utm_campaign"]);
var promocode = unescape(params["promo"]);
        expdate.setTime (expdate.getTime() + (1000 * 60 * 60 * 24 * 31));
document.cookie = "utmsource1C=" + utmsource + "; path=/; expires=" + expdate;
document.cookie = "utmsource2C=" + utmmed + "; path=/; expires=" + expdate;
document.cookie = "utmsource3C=" + utmcont + "; path=/; expires=" + expdate;
document.cookie = "utmsource4C=" + utmcamp + "; path=/; expires=" + expdate;
document.cookie = "utmsource5C=" + promocode + "; path=/; expires=" + expdate;