/* 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 = {};
    this.parameterNames = new Array();

    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 val = this.params[name];
        if (typeof val == "undefined") {
            this.parameterNames[this.parameterNames.length] = name;
            val = new Array();
            this.params[name] = val;
        }
        val[val.length] = (pair.length==2) ? pair[1] : name;
	}
}

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);
}

QueryString.prototype.getParameterNames = function() {
    return this.parameterNames;
}