function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[[]]/g, ‘\$&’);
    var regex = new RegExp(‘[?&]’ + name + ‘(=([^&#]*)|&|#|$)’),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return ”;
    return decodeURIComponent(results[2].replace(/+/g, ‘ ‘));
}