LightBox

HOW TO USE
====================
Step 1 - Load the Javascript and CSS

1. Download and unzip the latest version of Lightbox.
2. Look inside the js folder to find jquery-1.11.0.min.js and lightbox.min.js and load both of these files. Load jQuery first.
3. <script src="js/jquery-1.11.0.min.js"></script>
4. <script src="js/lightbox.min.js"></script>
5. Look inside the css folder to find lightbox.css and load it.
6. <link href="css/lightbox.css" rel="stylesheet" />
7. Look inside the img folder to find close.png, loading.gif, prev.png, and next.png. These files are used in lightbox.css. By default, lightbox.css will look for these images in a folder called img.

Step 2 - Turn it on

1. Add a data-lightbox attribute to any image link to activate Lightbox. For the value of the attribute, use a unique name for each image. For example:
2. <a href="img/image-1.jpg" data-lightbox="image-1" data-title="My caption">Image #1</a>
3. Optional: Add a data-title attribute if you want to show a caption.
4. If you have a group of related images that you would like to combine into a set, use the same data-lightbox attribute value for all of the images. 

For example:
<a href="img/image-2.jpg" data-lightbox="roadtrip">Image #2</a>
<a href="img/image-3.jpg" data-lightbox="roadtrip">Image #3</a>
<a href="img/image-4.jpg" data-lightbox="roadtrip">Image #4</a>

Source:
http://lokeshdhakar.com/projects/lightbox2/