/* 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);

}