var cpmstarRootURL = "http://www.weeworld.com/virtualSection/cpmstar/";


function getElementsByClass(searchClass, node, tag) {
    var classElements = new Array();
    if (node == null)
        node = document;
    if (tag == null)
        tag = '*';
    var els = node.getElementsByTagName(tag);
    var elsLen = els.length;
    var pattern = new RegExp("(^|\\s)" + searchClass + "(\\s|$)");
    for (i = 0, j = 0; i < elsLen; i++) {
        if (pattern.test(els[i].className)) {
            classElements[j] = els[i];
            j++;
        }
    }
    return classElements;
}


function PageQuery(q) {
    if (q.length > 1) this.q = q.substring(1, q.length);
    else this.q = null;
    this.keyValuePairs = new Array();
    if (q) {
        for (var i = 0; i < this.q.split("&").length; i++) {
            this.keyValuePairs[i] = this.q.split("&")[i];
        }
    }
    this.getKeyValuePairs = function() { return this.keyValuePairs; }
    this.getValue = function(s) {
        for (var j = 0; j < this.keyValuePairs.length; j++) {
            if (this.keyValuePairs[j].split("=")[0] == s)
                return this.keyValuePairs[j].split("=")[1];
        }
        return false;
    }
    this.getParameters = function() {
        var a = new Array(this.getLength());
        for (var j = 0; j < this.keyValuePairs.length; j++) {
            a[j] = this.keyValuePairs[j].split("=")[0];
        }
        return a;
    }
    this.getLength = function() { return this.keyValuePairs.length; }
}
function queryString(key) {
    var page = new PageQuery(window.location.search);
    return unescape(page.getValue(key));
}
function displayItem(key) {
    if (queryString(key) == 'false') {
        document.write("you didn't enter a ?name=value querystring item.");
    } else {
        document.write(queryString(key));
    }
}


// function to generate refcode state asynchronously
function generateRefCodeState() {

    // get / set the refcode value
    var refcode = "MIMO_01"; // default
    if (queryString("refcode") != 'false') refcode = queryString("refcode");

    try {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
        try {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (E) {
            xmlhttp = false;
        }
    }
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
        try {
            xmlhttp = new XMLHttpRequest();
        } catch (e) {
            xmlhttp = false;
        }
    }
    if (!xmlhttp && window.createRequest) {
        try {
            xmlhttp = window.createRequest();
        } catch (e) {
            xmlhttp = false;
        }
    }

    // only request header information, minimises size of response
    xmlhttp.open("HEAD", "http://www.weeworld.com/?refcode=" + refcode, true);
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == 4) {
            //alert(xmlhttp.responseText)
            //alert(xmlhttp.getResponseHeader("Last-Modified"));
        }
    }
    xmlhttp.send(null);
    return refcode;
}

function setBannerImage(theRefCode) {

    var adBannerImage;
    if (queryString("creative") != 'false') adBannerImage = queryString("creative");
    else adBannerImage = theRefCode;
    document.getElementById("cpmstarBannerImage").src = cpmstarRootURL + adBannerImage + ".png";
}