Link List in JavaScript

I'm making tetris version 2, and it have a link list in it. Figure it a good idea to share :D.

Using the list list,
The following use inheritance in JavaScript and make a sub class Candy.

Candy = function(flavor){
  this.super = LinkListItem;
  this.super();
  this.flavor = flavor;
  this.toString = function(){
    return this.flavor + ' Candy' ;
  }
}

box = new LinkList();
box.append(new Candy('Apple'));
box.append(new Candy('Banana'));
box.append(new Candy('Orange'));
alert('I have '+box+' in my box');

Source Code

/**
 * A simple like list
 */
 
LinkList = function(){
  startItem = null;
  endItem = null;
  /**
   * Add an item to the end of the list
   */
  this.append = function (item){
    item.backward = this.endItem;
    item.forward = null;
    item.parent = this;
    if(this.endItem){
      this.endItem.forward = item
    }
    if(!this.startItem){
      this.startItem = item;
    }
    this.endItem = item;
  }
  /**
   * Add the item to the front of the list
   */
  this.prepend = function (item){
    item.forward = this.startItem;
    item.backward = null;
    item.parent = this;
    if(this.startItem){
      this.startItem.backward = item
    }
    this.startItem = item;
  }
  
  /**
   * Remove the item from the list
   */
  this.remove = function(item){
    if(item.backward){
      item.backward.forward = item.forward;
    }
    
    if(item.forward){
      item.forward.backward = item.backward;
    }
    
    if(this.startItem == item){
      this.startItem = item.forward;
    }

    if(this.endItem == item){
      this.endItem = item.backward;
    }
    item.parent = null;
  }
  
  this.toString = function(){
    var item = this.startItem;
    var items = new Array();
    while(item != null){
      items.push(item);
      item = item.forward;
    }
    if(!items.length){
      return "Empty";
    }
    return items.join(', ');
  }
}

/**
 * A link list item
 */
LinkListItem = function(){
  this.parent = null;
  this.forward = null;
  this.backward = null;

  this.remove = function(){
    if(this.parent){
      this.parent.remove(this);
    }
  }
  
  this.moveToFront = function(){
    if(this.parent){
      var parent = this.parent;
      parent.remove(this);
      parent.prepend(this);
    }
  }
  
  this.moveToBack = function(){
    if(this.parent){
      var parent = this.parent;
      parent.remove(this);
      parent.append(this);
    }
  }
}

/**
 * Testing Script
 *
Candy = function(flavor){
  this.inherit = LinkListItem;
  this.inherit();
  this.flavor = flavor;
  this.toString = function(){
    return this.flavor + ' Candy' ;
  }
}

var box = new LinkList();
box.append(new Candy('Apple'));
box.append(new Candy('Banana'));
box.append(new Candy('Orange'));
alert("What Do I have in my box? " + box);
/***/