/*
ポップアップウィンドウの制御
*/

var PopupWindow = Class.create();
PopupWindow.prototype = {
 initialize: function(className, parentElement) {
  var elements 
        = document.getElementsByClassName(className, parentElement);
  for (var i = 0, len = elements.length; i < len; i++) {
   Event.observe(elements[i], 'click', 
                 this.addPopupEvent.bindAsEventListener(this));
   Event.observe(elements[i], 'keypress', 
                 this.addPopupEvent.bindAsEventListener(this));
  }
 },
 addPopupEvent: function(event) {
  var element = Event.element(event);
  var link = element.getAttribute('href');
  window.open(link);
  Event.stop(event);
 }
}; 
Event.observe(window, 'load', function () {
 new PopupWindow('popup');
});