Use Java-Webstart to start Rapla:

start Rapla (with java webstart)

Java-Webstart is included in all Java versions since 1.4.0.

Use Java-Plugin to start Rapla:

start Rapla (with Java-Plugin) doesn't work with netscape 4.7

More information:

To run Rapla, you need Java 1.4 or above which you can download from java.sun.com.

Check out rapla.sourceforge.net for more information.