/* Client-side access to querystring name=value pairs
        Version 1.3
        28 May 2008
	
	    License (Simplified BSD):
        http://adamv.com/dev/javascript/qslicense.txt
        */
        function Querystring(qs) { // optionally pass a querystring to parse
            this.params = {};

            if (qs == null) qs = location.search.substring(1, location.search.length);
            if (qs.length == 0) return;

            // Turn <plus> back to <space>
            // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
            qs = qs.replace(/\+/g, ' ');
            var args = qs.split('&'); // parse out name/value pairs separated via &

            // split out each name=value pair
            for (var i = 0; i < args.length; i++) {
                var pair = args[i].split('=');
                var name = decodeURIComponent(pair[0]);

                var value = (pair.length == 2)
			? decodeURIComponent(pair[1])
			: name;

                this.params[name] = value;
            }
        }

        Querystring.prototype.get = function(key, default_) {
            var value = this.params[key];
            return (value != null) ? value : default_;
        }

        Querystring.prototype.contains = function(key) {
            var value = this.params[key];
            return (value != null);
        }