function setReferrerCookie(documentReferrer) {
	var oldCookie = GetCookie("REFERRINGURL");
	if (oldCookie == null || oldCookie == "") {
		var url = document.URL;
		var ref = documentReferrer;
		if (url.indexOf("ref=") > 0) {
			ref = url.substring(url.indexOf("ref=")+4);
			if (ref.indexOf("&") > 0) {
				ref = ref.substring(0, ref.indexOf("&"));
			}
		}

		if (ref != null && ref != "") {
			var exp = new Date(); 
			exp.setTime(exp.getTime() + (365*24*60*60*1000));
			document.cookie = "REFERRINGURL=" + ref;
			document.cookie += ";expires=" + exp.toGMTString();
		}
	}
}

function GetCookie(name) {  
	var arg = name + "=";  
	var alen = arg.length;  
	var clen = document.cookie.length;  
	var i = 0;  
	while (i < clen) {    
		var j = i + alen;    
		if (document.cookie.substring(i, j) == arg)      
			return getCookieVal (j);    
		i = document.cookie.indexOf(" ", i) + 1;    
		if (i == 0) break;   
	}  
	return null;
}

function getCookieVal(offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function writeReferrerLink(link, documentReferrer, anchorParams) {
	var ref = GetCookie("REFERRINGURL");
	if (ref == null || ref == "") {
		var url = document.URL;
		if (url.indexOf("ReferringURL=") > 0) {
			ref = url.substring(url.indexOf("ReferringURL=")+13);
			if (ref.indexOf("&") > 0) {
				ref = ref.substring(0, ref.indexOf("&"));
			}
		} else {
			ref = documentReferrer;
		}
	}

	document.write("<a href='" + link);
	if (ref != null && ref != "") {
		if (link.indexOf("?") > 0) {
			document.write("&ReferringURL=" + ref);
		} else {
			document.write("?ReferringURL=" + ref);
		}
	}
	document.write("' " + anchorParams + ">");
}