/* 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, ' ')
  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 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
}