// JavaScript Document
/* 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=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, ' ');
	
	// parse out name/value pairs separated via &
	var args = qs.split('&');
	
	// 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 Querystring_get(key, default_) 
{
	// This silly looking line changes UNDEFINED to NULL
	if (default_ == null)
	{
		default_ = null;
	}
	
	var value=this.params[key];
	
	if (value==null)
	{
		value=default_;
	}
	
	return value;
}