/* Client-side access to querystring name=value pairs
	Version 1.2.3
	22 Jun 2005
	Adam Vandenberg
*/
function Querystring(qs)
{
	// optionally pass a querystring to parse
	this.params = new Object();
	this.get = readQuerystring;
	
	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 readQuerystring(key, defaultValue)
{
	// This silly looking line changes UNDEFINED to NULL
	if (defaultValue == null)
	{ defaultValue = null; }
	
	var value = this.params[key];
	if ( value == null )
	{ value = defaultValue; }
	
	return value;
}