$(document).ready(function() {
  var galleryOptions = {
    'imageScale' : true,
    'zoomOpacity': true,
    'zoomSpeedIn' : 300,
    'zoomSpeedOut': 300,
    'overlayShow': true,
    'enableEscapeButton' : true,
    'hideOnOverlayClick' : true,
    'hideOnContentClick' : true,
    'centerOnScroll' : true
  };
  $('a.gallery').fancybox(galleryOptions);
});