Sorry for the late reply. I was busy recently and I  found your message today.

I just modified the code and it is updated.

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/coaster2_pkg/coaster2.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(1004.7kB):double click downloaded file to run it. (2 times by 2 users) , Download EJS source View EJS source