Element.implement({
  hasElement: function(tag){
    return (tag == undefined) ? (this.getChildren().length > 0) : (this.getElement(tag) != null)
  },

  hasElements: function(tag){
    return (tag == undefined) ? (this.getChildren().length > 0) : (this.getElements(tag).length > 1)
  },

  hasEvent: function(eventType, fn){
    var myEvents = this.retrieve('events')
    return myEvents && myEvents[eventType] && (fn == undefined || myEvents[eventType].keys.contains(fn))
  },

  hasParent: function(tag){
    return (tag == undefined) ? (this.getParent().length > 0) : (this.getParent(tag) != null)
  },

  disable: function(){
    this.set('disabled', true)
    return this
  },

  enable: function(){
    this.set('disabled', false)
    return this
  }
})