/* Client-side access to querystring name=value pairs
  Version 1.3
  28 May 2008
  
  License (Simplified BSD):
  http://adamv.com/dev/javascript/qslicense.txt
*/
function Querystring(qs) { // optionally pass a querystring to parse
  this.params = {};
  
  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 pair = args[i].split('=');
    var name = decodeURIComponent(pair[0]);
    
    var value = (pair.length==2)
      ? decodeURIComponent(pair[1])
      : name;
    
    this.params[name] = value;
  };
};

Querystring.prototype.get = function(key, default_) {
  var value = this.params[key];
  return (value != null) ? value : default_;
};

Querystring.prototype.contains = function(key) {
  var value = this.params[key];
  return (value != null);
};