lightbox.js

    console.log('-= reject image lightbox');

    // Place this inside footer.php or into a JS file and use enqueue_script to load it in the more wp'ish way
    jQuery(function($){
        // this one creates a click function for every object that has the CSS class .popup-remove-image
        $(".popup-remove-image").click(function(e){
            // we disable the default click action of the clicked element
            e.preventDefault();
            // we save the data attributes of the clicked element into variables (not a must, you could call the directly)
            // Call the lightbox function and pass the arguments
            var reject_image;
            reject_image = $(this).data('reject-image');
            console.log(reject_image);
            lightbox_open(reject_image);
        });
    });

    window.document.onkeydown = function (e)
    {
        if (!e){
            e = event;
        }
        if (e.keyCode == 27){
            lightbox_close();
        }
    }
    function lightbox_open(){
        window.scrollTo(0,0);
        document.getElementById('light').style.display='block';
        document.getElementById('fade').style.display='block';
    }
    function lightbox_close(){
        document.getElementById('light').style.display='none';
        document.getElementById('fade').style.display='none';
    }