Use token in javascript

Hello everyone!
To view items in the CataBlog is used jQuery Colorbox (CataBlog lightbox is used to display a different catalog).
The image in the Colorbox is repeated over the entire surface as on the Backhausen website.

Here is the used template:

<script type="text/javascript">
function myFunction() {
	cboxContent.style.background = "url('%IMAGE-ORIGINAL%')";
}
</script>

<div class="catablog-row catablog-gallery">
	<a href="%IMAGE%" title="%DESCRIPTION%" onclick="myFunction()">
	<img src="%IMAGE-THUMBNAIL%" title="" alt="%TITLE%" /></a>
<div class="catablog-title">%TITLE%</div>
</div>

Javascript assigns a background to #cboxContent element in Colorbox, which is repeated over the entire surface.
The problem is that the token %IMAGE-ORIGINAL% always assigns the Colorbox background of the last item in the catalog on the page.
I need to assign the correct background to Colorbox (image of the selected item).
Information images are here: https://rich65.rajce.idnes.cz/CataBlog/
Anyone have any idea?
Thank you for answer.

RICH

https://www.ads-software.com/plugins/catablog/