[lightbox: url width:x height:y title] - Displays a thumbnail if picture is from this site or on allowed sites: flickr.com, staticflickr.com, picasa.com, img.youtube.com, upload.wikimedia.org, photobucket.com, imgur.com, imageshack.us, tinypic.com. This thumbnail links to the picture displayed in the lightbox.
Options: thumbnail width and height where x and y are in pixels. You can also use 'auto' for x or y. If a title is set, thumbnail is replace by title and you can also set any picture url.
[paypal: id alternate title] - Displays a link to a product using the product name as the title. An alternate title may be specified but is not required.
[paypal_product: id] - Displays a product image, product name, small description, "buy now" and "Add to cart" buttons.