/* Client-side access to querystring name=value pairs */

function Querystring(qs) {

	// optionally pass a querystring to parse
	this.params = new Object();
	this.get=Querystring_get;

	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 value;
		var pair = args[i].split('=');
		var name = unescape(pair[0]);

		if (pair.length == 2)
			value = unescape(pair[1]);
		else
			value = name;

		this.params[name] = value;
	}
};

function Querystring_get(key, default_) {
	// This silly looking line changes UNDEFINED to NULL
	if (default_ == null) default_ = null;

	var value=this.params[key];
	if (value==null) value=default_;

	return value;
};