Okay - a little more information.
On loading the product page in IE the source shows
<script language="javascript" type="text/javascript"><!--
document.write('<a href="javascript

opupWindow(\'http://www.testdomain1.com/shop/index.php?main_page=popup_image_additional&pID=1223&pic=1&products_i mage_large_additional=images/large/putters/miz_cseries_002_LRG.jpg\')"><img src="images/putters/miz_cseries_002.jpg" alt="Bettinardi C-Series Mizuno Putter - 6 Styles" title=" Bettinardi C-Series Mizuno Putter - 6 Styles " width="100" height="100" style="position:relative" onmouseover="showtrail('images/putters//miz_cseries_002.jpg','Bettinardi C-Series Mizuno Putter - 6 Styles',100,100,100,100,this,0,0,100,100);" onmouseout="hidetrail();" /><br />Enlarge</a>');
//--></script>
<noscript><a href="http://www.testdomain1.com/shop/index.php?main_page=popup_image_additional&pID=1223&pic=1&products_i mage_large_additional=images/large/putters/miz_cseries_002_LRG.jpg" target="_blank"><img src="images/putters/miz_cseries_002.jpg" alt="Bettinardi C-Series Mizuno Putter - 6 Styles" title=" Bettinardi C-Series Mizuno Putter - 6 Styles " width="100" height="100" style="position:relative" onmouseover="showtrail('images/putters//miz_cseries_002.jpg','Bettinardi C-Series Mizuno Putter - 6 Styles',100,100,100,100,this,0,0,100,100);" onmouseout="hidetrail();" /><br /><span class="imgLinkAdditional">Enlarge</span></a></noscript>
We still have no clue as to why as it appears the server is sending the info