Javascript Picture Gallery

Can anyone tell me how on the apple website link they made it so when you click either 17 inch, 20 inch, or 24 inch, the new image fades in?:

http://store.apple.com/1-800-MY-APPL...34A4&nclm=iMac

I looked at the code and saw where the 17 inch computer image is but I don't understand where they refer to the 20 and 24 inch and make it fade in.

Thanks for your help. I really appreciate it.

Code:

---

<script language="JavaScript" src="/rs/js/Gallery.js"></script>
    <script>
    var selectionGalleryConfig = {   
        initial : Gallery.TYPE_IMAGE,
        viewer : {elementId : "selection-gallery-window"}, 
        image : {
            thumb : {elementId : "labels", cssClass : null, cssActiveClass : "active"}, 
            full : {elementId : "selection-gallery-img-big"}
     
        },
        fade : {
            speed : 6,
            increment : 0.05
     
        }
    }

    selectionGalleryConfig.images = new Array();
   
      selectionGalleryConfig.images[0] = {full:"http://a248.e.akamai.net/7/248/2041/1164/store.apple.com/Catalog/US/Images/imac/img/product-17in.jpg"};
   
      selectionGalleryConfig.images[1] = {full:"http://a248.e.akamai.net/7/248/2041/1164/store.apple.com/Catalog/US/Images/imac/img/product-20in.jpg"};
   
      selectionGalleryConfig.images[2] = {full:"http://a248.e.akamai.net/7/248/2041/1164/store.apple.com/Catalog/US/Images/imac/img/product-24in.jpg"};
   

    var selectionGallery = new Gallery(selectionGalleryConfig);
    selectionGallery.index = 0;
    </script>

---

yes, and then the switching function is called from this link:

Code:

---

<a id="labels0" href="" onclick="selectionGallery.image(0); return false;" class="active">17 inch</a>

---

the biggest thing is just needing that Gallery.js file with the Gallery class. look in that file if you want to learn exactly how its working. heres a direct link to the Gallery.js

Thank you so much for your help.