The following applet should show a JavaScript alert box work in Netscape 3, MS Explorer 4, and later versions.

It does not work in Netscape 4.6 and produces the following stack trace: 

netscape.security.AppletSecurityException: security.checkcreateclassloader
  at netscape.security.AppletSecurity.checkCreateClassLoader(AppletSecurity.java:298)
  at java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:281)
  at java.lang.ClassLoader.<init>(ClassLoader.java:136)
  at netscape.applet.AppletClassLoader.<init>(AppletClassLoader.java:487)
  at netscape.applet.AppletClassLoader.getClassLoader(AppletClassLoader.java:447)
  at JavaScripter.start(JavaScripter.java:5)
* at netscape.applet.DerivedAppletFrame$StartAppletEvent.dispatch(DerivedAppletFrame.java:640)
  at java.awt.EventDispatchThread$EventPump.dispatchEvents(EventDispatchThread.java:81)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:135)
  at netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(DerivedAppletFrame.java:911)
Corrected in 4.61.

JavaScripter.java