Just a super simple jQuery closure-style gallery that's not a plugin...

super_simple_gallery.js

var productGallery = $('.productGallery');
	if(productGallery.length) {
		(function() {
			
			// Define some dynamics and cache selectors
			
			var largeContainer = productGallery.find('.caraLarge').eq(0),
				thumbContainer = productGallery.find('.caraThumbs').eq(0),
				currentIndex = 0,
				prev = productGallery.find('.prev').eq(0),
				next = productGallery.find('.next').eq(0)
				disabled = false,
				currentClass = 'current',
				thumbs = thumbContainer.find('a'),
				largeImages = largeContainer.find('li'),
				largeWidth = largeImages.eq(0).width();
			
			// Click the thumbnails to change the main image...
			
			thumbs.click(function(e) {
				
				// Event selectors
				var thumb = $(this);
				var index = thumb.parent('li').index();
				e.preventDefault();
				
				// Can it be clicked?
				if(disabled === true) return;
				else disabled = true;
				
				// Current class
				thumbs.parent('li').removeClass(currentClass);
				thumb.parent('li').addClass(currentClass);
				
				// Animate the container
				largeContainer.animate({
					left: ((index * largeWidth) * -1)
				}, {
					duration: 600,
					easing: 'easeInOutCirc',
					complete: function() {
						disabled = false;
						currentIndex = index;
					}
				});
				
			}).eq(0).click();
			
			// Previous and next wrappers.
			
			var adjacentClick = function(e, difference) {
				var self = $(this);
				if(!self.hasClass(disabledClass)) {
					thumbs.eq(difference).trigger('click');
				}
			};
			
			prev.click(function(e) { e.preventDefault(); adjacentClick(e, (currentIndex - 1)); });
			next.click(function(e) { e.preventDefault(); adjacentClick(e, (currentIndex + 1)); });
			
		})();
	}