PMQueryString = function (url)
{
	QueryString.call (this, url);
}

PMQueryString.prototype = new QueryString ();
PMQueryString.prototype.constructor = PMQueryString;
PMQueryString.prototype.parent = QueryString.prototype;

PMQueryString.prototype.getQueryString = function (arrayOfKeys)
{
	var pmKeyValues = ["MM_webID", "keyCode"];
	var queryString = this.parent.getQueryString.call (this, arrayOfKeys? arrayOfKeys: pmKeyValues);

	return queryString;
}