function querystring(key)
{
var value = null;
for (var i=0;i<querystring.keys.length;i++)
	{
	if (querystring.keys[i]==key)
		{
		value = querystring.values[i];
		break;
		}
	}
return value;
}

querystring.keys = new Array();
querystring.values = new Array();

function querystring_Parse()
{
var query = window.location.search.substring(1);
var pairs = query.split("&");

for (var i=0;i<pairs.length;i++)
	{
	var pos = pairs[i].indexOf('=');
	if (pos >= 0)
		{
		var argname = pairs[i].substring(0,pos);
		var value = pairs[i].substring(pos+1);
		querystring.keys[querystring.keys.length] = argname;
		querystring.values[querystring.values.length] = value;
		}
	}
}

querystring_Parse();