Overload funcion in javascript

gistfile1.js

var overloadMethod = (function () {
  var functionsByLength = []

  function RunOverLoadFunction() {
    //console.log(arguments.length)
    if( typeof(functionsByLength[arguments.length]) == 'function' )
      functionsByLength[arguments.length]()
    else {
      throw new ReferenceError('function is not defined')
      }
  }

  return function (obj, prop) {
    obj.__defineGetter__(prop, function () {
      return RunOverLoadFunction;
    })

    obj.__defineSetter__(prop, function (value) {
      functionsByLength[value.length] = value
    })
  }

})()

//Examples:
obj = {
  prop: 'val'
}
overloadMethod(obj, 'actions');

obj.actions = function () {
 console.log('actions 0 arguments')
}
obj.actions = function (a, b) {
 console.log('actions 2 arguments')
}

obj.actions()

obj.actions(1, 2)

obj.actions(1,2,3)// oops not defined

other realization:
http://ejohn.org/blog/javascript-method-overloading/#postcomment
http://habrahabr.ru/blogs/javascript/86403/
etc...