function w3tc_show_minify_help() {
  W3tc_Lightbox.open({
    id: 'w3tc-overlay',
    close: '',
    width: 800,
    height: 610,
    url: ajaxurl + '?action=w3tc_ajax&_wpnonce=' + w3tc_nonce +
      '&w3tc_action=minify_help',
    callback: function(lightbox) {
      jQuery('.btn-primary', lightbox.container).click(function() {
        lightbox.close();
      });
    }
  });
}



jQuery(function($) {
  $('#minify__enabled').click(function() {
    var checked = $(this).is(':checked');
    if (!checked)
      return;

    w3tc_show_minify_help();
  });
});