I have no problem download those two files:
[url=http://www.phy.ntnu.edu.tw/ntnujava/ntnujavazip.php?ejsuserjar=1940]Download EJS jar file ejs_users_ntnu_fkh_caliper.jar(1305.7kB)[/url]
and [url=http://www.phy.ntnu.edu.tw/ntnujava/ntnujavazip.php?ejsuserjar=1944]Download EJS jar file: ejs_users_ntnu_fkh_caliper.jar(1327.6kB)[/url]

It should not ask for password if you have login to the system already.