Get query parameter from url

URL = {
    getUrlParams: function ( name, url ) {
        if (!url) url = window.location.href;
        name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
        var regexS = "[\\?&]"+name+"=([^&#]*)";
        var regex = new RegExp( regexS );
        var results = regex.exec( url );
        return results == null ? null : results[1];
    }
};

Usage:

URL.getUrlParams('q')