my-gallery.js

$(document).ready(function () {
  var galleryCheck = $("div.gallery_sef").length;

  if( !galleryCheck ) return;

  var extensions = ["_pico.", "_icon.", "_thumb.", "_small.", "_compact.", "_medium.", "_large.", "_grande.", "_1024x1024.", "_2048x2048." ];

  $("div.gallery_sef img").each(function(){
    var $img = $(this);
    var src = $img.attr('src');
    var title = $img.attr('title');
    var newSRC;

    for ( var i = 0; i < extensions.length; i++ ){
      newSRC = src.replace( extensions[i] ,'.');
      if (newSRC.length<src.length) break;
    }
    $(this).wrap( '<a href="' + newSRC + '" data-lightbox="gallery" data-title="' + title + '" rel="nofollow"></a>');
  });
});