function getQueryString() {
    var urlStr = document.location.href;
    var i = urlStr.indexOf("?");
    if (i != -1) {
        return urlStr.substring(i, urlStr.length);
    }
    
    return null;
}

function getParameter(name, defaultValue) {
    if (defaultValue == null) {
        defaultValue = null;
    }
    var url = document.location.href;
    var i = url.indexOf(name + "=");
    if (i != -1) {
        var valuestart = i+name.length+1;
        var valueend = url.length;
        i = url.indexOf("&", valuestart)
        if (i != -1) {
            valueend = i;
        }
        return unescape(url.substring(valuestart, valueend));
    }
    return defaultValue;
}