/*
* Function to pass a query string to parse
* Pre-Condtion: The query string must exist.
* Post-Condition: The Query String is passed
*
*
* @param        qs - standard query string
* @author       Seisan Consulting   2-16-2006
*/
function Querystring(qs) {
	//Get the Query String
	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 to retrieve the query string
*
* @param		key - a key for retrieving a parameter
* @param        default_ - default value
* @return		value - retuns value of the query string
* @author       Seisan Consulting   2-16-2006
*/
function Querystring_get(key, default_) {
	//Changes UNDEFINED to NULL
	if (default_ == null) default_ = null;

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

	return value;
}