function parameterList(querystring) {
  	if(querystring == '') return;
  	var valuestring = unescape(querystring);
  	valuestring = valuestring.slice(1);
  	var pairs = valuestring.split("&");
  	for (var i=0; i < pairs.length; i++) {
    		var name = pairs[i].substring(0, pairs[i].indexOf("="));
    		var value = pairs[i].substring(pairs[i].indexOf("=")+1, pairs[i].length);
    		this[name] = value;
         }
}