function getParameterByName(name, url) {
    if (!url) url = window.location.search;
    url = decodeURIComponent(url);
    url = url.replace(/\s&\s/ig,'%20%26%20');
    url = url.replace(/\+/ig,' ');
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    var val = decodeURIComponent(results[2].replace(/\+/g, " "));
    return val.replace(/%26/ig,'&');
}