Want to add a couple of cool features to your Web site without delving into the world of Web programing? In this case, you might want to give GreyBox a try. It’s a tiny (only 22KB) JavaScript-based tool, released under the LGPL, that allows you to add page-in-a-page and gallery features using just a few easy-to-understand lines of code (check GreyBox’ Web site for some examples).

Source: GreyBox: Jazz up your Web site in 10 minutes