This will add a helper for thickboxes in Rails. (It is a fork of Lipsiasoft/lightbox) It is a work in progress, though. So please be patience.
<%= javascript_include_tag :defaults %>
You must add also the stylesheet so add this on your page head:
<%= stylesheet_link_tag 'lightbox' %>
The is very simple for add a LightBox in your page add this:
<%= lightbox_link_to "Link Name", "/path/of/your/image.png" %>
OR
<%= lightbox_image_tag("/path/of/your/image-thumb.png", "/path/of/your/image.png", {:class=>"images"}, :title => "This is a test!") %>
You can add, title, controller, action what do u whant becaue it's based on image_tag and link_to.
Vist my website: http://blog.lipsiasoft.com