An iframe isn't going to work for this type of gallery. This gallery uses a lightbox that covers the entire screen when clicked and an iframe will only be able to control the frame it is opened in.
I could help you write some custom script to get this to work in an iframe, but by default the iframe would have to cover the whole page to have the whole page lightbox effect it uses when images are clicked.
I tried following the url to your site but the iframe doesn't display at all right now because the page is displayed through https:// and the iframe is referenced with just http://.... it will block non-secure pages in iframes when viewed on a secure page automatically. But even once you get it to display the banner, I don't think an iframe solution is going to work for you.