script help

Basically i want to be able to track a url query string with javascript and a cookie and then dump that into a hidden form field. i found a script for the cookie:

var cDomain = self.location.hostname;
if(cDomain.indexOf(".") < cDomain.lastIndexOf(".")){
var domainOffset = cDomain.indexOf(".")+1
cDomain = cDomain.substr(domainOffset);
}

if(document.referrer.indexOf(cDomain)==-1 && document.referrer!="" && document.cookie.indexOf("referrer=")==-1){
var expDays = 90;
var exp = new Date();
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
var refdate = new Date();
document.cookie = "referrer=" + escape(document.referrer + "&&&" + refdate.toGMTString()) + "; expires=" + exp.toGMTString() + "; path=/" + "; domain=" + cDomain;
}

var allCookies = document.cookie;
var cPos = allCookies.indexOf("referrer=");
if(cPos != -1){
var cdstart = cPos + 9;
var cdend = allCookies.indexOf(";", cdstart);
if(cdend == -1) cdend = allCookies.length;
var cookieContent = allCookies.substring(cdstart,cdend);
cookieContent = unescape(cookieContent);
var cdatestart = cookieContent.indexOf("&&&", 0);
var cdateend = cookieContent.length;
var cRefer = cookieContent.substring(0,cdatestart);
var cDateRef = cookieContent.substring(cdatestart +2,cdateend)
}
else{
var cRefer = "No cookie";
var cDateRef = "No cookie";
}

and for dumping it into the field i have:

');
document.write('');
//end hiding-->
</script>

When i try and test from an outside url with query string it all i seem to get is "no cookie", any suggestions?