Javacript based image syndication

We run a photo library site and wish to make a JavaScript/json based way of syndicating our images and getting them displayed on other peoples websites, like a widget. We would like website owners to simply add some JavaScript to their site which would then display a widget of the latest 10 groups/categories of images (with title, date and thumbnail) from our site. When someone clicks on thumbnail of that category we want the large image to be displayed in their website in a lightview/lightbox type of pop up, with a link back to our site so they can download the image. The pop up should show the current Large images as well as thumbnails of the other images in that category on the side for easy navigation (see attached image for example) We would like the uses of the widget to be able to customize it's width/height/background color/link and text color/border and the number of categories to display. I have attached two examples, one of how the widget would look and the other on how the lightbox would look.