Thanks you for posting your good comments about this applet.
It is always improving based on prof hwang's several different applets on the same topic plus I ask some questions about how to do Some pedagogy hints and input fields to get students to test their understanding.

I have changed the layout today to fit width =600 for my blog entry
[s]http://Sgeducation.blogspot.com[/s]
http://weelookang.blogspot.com
:-)