Simulations I created before 2001 were not generated with EJS. So I put those simulation under category :  [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php#2]JDK1.0.2 simulations (1996-2001)[/url]: all the simulation in this category are created with JDK1.0.2
Java class files and the html content are available for download as ZIP file.
Unzip the file you have download and open the html file with your browser to view the simulation.
It should work fine if you have java installed. (I just checked it again.)

Simulations created with EJS can be found under  [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php#3]Easy Java Simulations (2001- )[/url]: EJS source and generated jar files are available for download.