// document ready
$(document).ready(function(){
  slideShow();
});
//slideshow
function slideShow() {
  var current = $('#galleryImg .show');
  var next = current.next().length ? current.next() : current.parent().children(':first'); 
  current.hide().removeClass('show');
  next.fadeIn().addClass('show');
  setTimeout(slideShow, 4000);
}