I have put on one of my sites several like buttons. When I click on the button and want to share with FB, then it takes just one JPG from my site but I want that it shares on FB with a specific selected JPG from the site. Is there anyone who knows how to relate a share on FB with a selected jpg from my site?

Here is e.g. a generated code do I have to add anything that the shared FB button will take a specific jpg? If yes please let me know where..and how..

<!-- LikeBtn.com BEGIN -->
<span class="likebtn-wrapper" data-identifier="YujaWang_sq"></span>
<script>(function(d,e,s){if(d.getElementById("like btn_wjs"))return;a=d.createElement(e);m=d.getEleme ntsByTagName(e)[0];a.async=1;a.id="likebtn_wjs";a.src=s;m.parentNode .insertBefore(a, m)})(document,"script","//w.likebtn.com/js/w/widget.js");</script>
<!-- LikeBtn.com END -->