Dear Fu-Kwun Hwang,
I am sorry for trying to download so many applets in such a short time frame.  I am a physics student and quite near finishing a degree to teach high school natural sciences.  These applets will be very useful to me in the classroom later in my career.  Also, in my Physics for Teachers course we have to teach 50 minute classes every week and a half so it is nice to have these for demo purposes. 
Thanks very much for all your hard work, time, and consideration,
Scott Biltoft