i help u :)

do post up your applet here at NTNUJAVA Virtual Physics Laboratory say http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=28.0 or any relevant board?
your applet looks like an electronic topic maybe http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=16.0

do share your work (applet and worksheets etc) here! we are nurturing a learning community of Ejs users.