config_instance.html

<?php
    echo require_js(array( 
    $CFG->wwwroot . '/blocks/wookie/lib/jquery-1.2.3.pack.js'
    ));
    
    $gallery = new gallery();
    print($gallery->showGallery());
?>

<script type="text/javascript">

jQuery(document).ready(function() {

   $('.wookie-button').mouseover(function(){
      $(this).css("backgroundColor","#2888D8");
   });

   $('.wookie-button').mouseout(function(){
      $(this).css("backgroundColor","#2878C0");
   });
   
    jQuery('#widget_gallery').click( function(e){
        var $clicked_element = $(e.target)
        if ( $clicked_element.is('input') ){
            e.preventDefault();
            var widget_id = $clicked_element.attr('id');
            var widget_type = $clicked_element.attr('name')
            $("#widget_id").val(widget_id);  
            $("form[name='block-config']").submit();       
        }
    });

});

</script>

<input type="hidden" name="widget_id" id="widget_id"/>