I did a view source on the exampple page you gave, and saw missing defines. See: value="THESE_UPPERCASE_ARE_NOTDEFINED"
Code:
<!--bof Main Product Image -->
<div id="image_viewer" style="height: 10px">
<!-- bof Zen Slimbox v0.1 btyler 2007-12-04 -->
<div id="image_medium_container">
</div>
<div id="image_nav_container">
<a id="arrow_left" href="javascript:viewPrevious()" class="back"></a>
<a id="arrow_right" href="javascript:viewNext()" class="forward"></a>
</div> </div> <input type="hidden" id="ais_image_num" value="IMAGE_VIEWER_IMAGES_NUM" />
<input type="hidden" id="ais_small_container_width" value="IMAGE_VIEWER_SMALL_IMAGE_WIDTH" />
<input type="hidden" id="ais_small_container_height" value="IMAGE_VIEWER_SMALL_IMAGE_HEIGHT" />
<input type="hidden" id="ais_scroll_size" value="IMAGE_VIEWER_SCROLL_SIZE" />
<input type="hidden" id="products_id" name="products_id" value="" />
<!--eof Main Product Image-->
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