http://javascript.internet.com/
http://www.javascript.com/
http://www.free-javascripts.com/
http://java.sun.com/applets/
Also check out DHTML: http://www.dynamicdrive.com/
This is what my search came up with. I remember a few years back being very interested in Java and DHTML for using on my website. When I switched to a new machine I forgot to hop over the bookmarks....

Smething was called Javabrain something, a nice site with the actual scripts running as examples...did a search on that, no results