function mapobject (fun, obj) {
 var result = new Object()
 for (var i in obj) {
  (result[i] = fun(i, obj[i]))
 }
 return result
}

function extend (source, target) {
 var target = target || new Object()
 mapobject(function (k, v) {
  try {
   target[k] = v
  } catch (err) {
   _debug(err)
  }
 }, source)
 return target
}