JavaScript JavaScript - Objektmethoden werden überschrieben

var sliderWidget = {
	init: function( settings ){
		
		this.config = {
			sliderNumber: 0,
			hasBullets: false,	
			hasThumbnails: false				
		};
		
		$.extend( this.config, settings );
		
		this.initials = {
			$thumbnails: {},
			$pictures: {},
			$bntNext: {},
			$btnPrev: {},
			$bullets: {},
			total: 0,	
			currentIndex: 0
		};
		
		$.extend( this, this.initials );		
		
		sliderWidget.setup();
	},
	
	setup: function(){
		
		this.$pictures = $(".slide-"+this.config.sliderNumber);
		this.$btnNext = $(".slider-btn-next-"+this.config.sliderNumber);
		this.$btnPrev = $(".slider-btn-prev-"+this.config.sliderNumber);
		
		if(this.config.hasThumbnails){
			this.$thumbnails = $(".own-thumbnail-" + this.config.sliderNumber);
			
			this.$thumbnails.click($.proxy(function(event){
				this.config.currentIndex = $(event.currentTarget).index();
				this.cycleItems();
			},this));		
		}

		this.$btnNext.click($.proxy(function () {
			this.updateIndex(1);
			this.cycleItems();
		}, this));
	
		this.$btnPrev.click($.proxy(function () {
			this.updateIndex(-1);
			this.cycleItems();
		}, this));	
		
		this.total = this.$pictures.length;
		
		if(this.config.hasBullets){
			var $previewSlider = $(".preview-slider");
			$previewSlider.append("<ul class='bullets'>");
			for(var i = 0; i < this.total;i++){
				$previewSlider.append("<li class='bullet bullet-" + this.config.sliderNumber +"'</li>");	
			}	
			$previewSlider.append("</ul>");
			this.$bullets	= $(".bullet-" + this.config.sliderNumber);
		}		
	},
	
	updateIndex: function(increment){
		this.currentIndex += increment;
		if (this.currentIndex > this.total - 1) {
			this.currentIndex = 0;
		}else if(this.currentIndex < 0){
			this.currentIndex = this.total - 1;
		}
	},
	
	cycleItems: function() {
		var $picture = this.$pictures.eq(this.currentIndex);
		if(this.config.hasThumbnails){
			var $thumbnail = this.$thumbnails.eq(this.currentIndex);
			this.$thumbnails.removeClass("active");
			$thumbnail.addClass("active");
		}
		this.$pictures.removeClass("active");
		$picture.addClass("active");
	} 
}

 $(function() {
   
   var args = {
     hasThumbnails: true,
     sliderNumber: 1,
     hasBullets: true
   }
   
    var args2 = {
     hasThumbnails: false,
     sliderNumber: 2,
     hasBullets: false
   }
   
  sliderWidget.init(args);
  sliderWidget.init(args2);

});

function person(first, last, age, eye) {
    this.firstName = first;
    this.lastName = last;
    this.age = age;
    this.eyeColor = eye;
}
var myFather = new person("John", "Doe", 50, "blue");
var myMother = new person("Sally", "Rally", 48, "green");