function Querystring(a) { this.params = {}; if (a == null) a = location.search.substring(1, location.search.length); if (a.length == 0) return; a = a.replace(/\+/g, ' '); var b = a.split('&'); for (var i = 0; i < b.length; i++) { var c = b[i].split('='); var d = decodeURIComponent(c[0]); var e = (c.length == 2) ? decodeURIComponent(c[1]) : d; this.params[d] = e } }; Querystring.prototype.get = function (a, b) { var c = this.params[a]; return (c != null) ? c : b }; Querystring.prototype.contains = function (a) { var b = this.params[a]; return (b != null) };