var trackingUrl = "http://www.leisuredirectories.com/tracking/affp.jpg";

trackAffiliate();

function trackAffiliate() {
    var AID = getQSParam("AID");
    if (AID == null || AID == "") {
        return;
    }

    var url = trackingUrl + "?AID=" + AID;
    if (document.referrer != "") {
        url = url + "&REF=" + escape(document.referrer);
    }

    document.write("<img src='" + url + "'/>");
}

function getQSParam(paramName) {
    var query = window.location.search.substring(1);
    var queryPairs = query.split("&");
    for (var i = 0; i < queryPairs.length; i++) {
        var pair = queryPairs[i].split("=");
        if (pair.length < 2) {
            continue;
        }
        if (pair[0] == paramName) {
            return pair[1];
        }
    }

    return null;
}