Zen Lightbox addon [Support Thread]

[Quimbly]

Hoping someone can help me here...

I'm just putting together a super simple implementation of this add-on on my own. I suspect, that the problem I'm having would have had to be resolved by others, so I'm hoping they can help.

I tried Lightbox, but am now using Slimbox, as it's smaller, and displays long title text nicer in the popups than LightBox.

The only changes I made were as follows:

In html_header.php, I added:

<link rel="stylesheet" href="slimbox/css/slimbox.css" type="text/css" media="screen" />
<script type="text/javascript" src="slimbox/js/mootools.js"></script>
<script type="text/javascript" src="slimbox/js/slimbox.js"></script> 

And my tpl_modules_main_product_image.php file now looks like:

<?php require(DIR_WS_MODULES . zen_get_module_directory(FILENAME_MAIN_PRODUCT_IMAGE)); ?> 
<div id="productMainImage" class="centeredContent back">

<?php
  echo '<a rel="lightbox" href="' . zen_href_link(FILENAME_POPUP_IMAGE, 'pID=' . $_GET['products_id']) . '">' . zen_image($products_image_medium, $products_name, MEDIUM_IMAGE_WIDTH, MEDIUM_IMAGE_HEIGHT) . '</a>';
?>
</div>

Couldn't really get much simpler. When I click on the image, the Slimbox popup appears, but it just wait indefinitely. The exactly same thing happened when I used LightBox instead.

Does anyone know why the image is NOT loading?