var slideshow = {
   
   left : null,
   right : null,
   photo : null,
   image : null,
   init : function () {
      this.photo = document.getElementById("photo");
      this.right = document.getElementById("right");
      this.left = document.getElementById("left");
      this.image = document.getElementById("image");
      this.right.onclick = this.swapright;
      this.left.onclick = this.swapleft;
   },
   
   swapright : function () {
      if(slideshow.right.name === "one"){
         slideshow.image.src = "images/v2.jpg";
         slideshow.right.name = "two";
      }
      else if(slideshow.right.name === "two"){
         slideshow.image.src = "images/v3.jpg";
         slideshow.right.name = "three";
      }
      else if(slideshow.right.name === "three"){
         slideshow.image.src = "images/v4.jpg";
         slideshow.right.name = "four";
      }
      else if(slideshow.right.name === "four"){
         slideshow.image.src = "images/v5.jpg";
         slideshow.right.name = "five";
      }
      else if(slideshow.right.name === "five"){
         slideshow.image.src = "images/v6.jpg";
         slideshow.right.name = "six";
      }
      else if(slideshow.right.name === "six"){
         slideshow.image.src = "images/v7.jpg";
         slideshow.right.name = "seven";
      }
      else if(slideshow.right.name === "seven"){
         slideshow.image.src = "images/v1.jpg";
         slideshow.right.name = "one";
      }
   },
   
   swapleft : function () {
      if(slideshow.right.name === "one"){
         slideshow.image.src = "images/v7.jpg";
         slideshow.right.name = "seven";
      }
      else if(slideshow.right.name === "seven"){
         slideshow.image.src = "images/v6.jpg";
         slideshow.right.name = "six";
      }
      else if(slideshow.right.name === "six"){
         slideshow.image.src = "images/v5.jpg";
         slideshow.right.name = "five";
      }
      else if(slideshow.right.name === "five"){
         slideshow.image.src = "images/v4.jpg";
         slideshow.right.name = "four";
      }
      else if(slideshow.right.name === "four"){
         slideshow.image.src = "images/v3.jpg";
         slideshow.right.name = "three";
      }
      else if(slideshow.right.name === "three"){
         slideshow.image.src = "images/v2.jpg";
         slideshow.right.name = "two";
      }
      else if(slideshow.right.name === "two"){
         slideshow.image.src = "images/v1.jpg";
         slideshow.right.name = "one";
      }
   }
};

slideshow.init();