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Swapping images with JavaScript using arrays

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8.2
Hi there

I'm trying to create a page with one large image with a link underneath it called 'next'. When you click on it the image swaps. For some reason, although it works, I keep getting errors. In iexplorer it says 'document.images[..] is null or not and object' and firefox says 'document.images[imgName].src has no properties'.

The HTML code looks like this:
<div id="container">
  <div id="imageContent">
   <img src="_photos/_architecture/_full/arch3_lrg.jpg" name="mainPhoto" alt="London Blackfriars" width="432" height="504" border="0" />
   <div id="buttons"><a href="javascript:switchImageNext('mainPhoto','imgSrc')"> next&nbsp;>></a></div>
  </div>
</div>

The javascript looks like this:
var $images = new Array('arch4_lrg.jpg','arch_gla_lrg.jpg','arch3_lrg.jpg');
var $images_total = $images.length;
var count = 0;

function switchImageNext(imgName,imgSrc)

{
  if (count < $images_total)
  {       
        imgSrc = $images[count];
        
        document.images[imgName].src = imgSrc;
        
        count++;
  }
  else
          count = 0;
          switchImageNext();
}
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