Java3d-Trouble with installtion

Hello!

I\'m trying to install Java3D and test a simpel applet. After I have install Java3D and convert the html file and try to run the applet throug the appletviewer in textpad I get this error:

java.lang.NoClassDefFoundError: javax/media/j3d/Group
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Class.java:237)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:579)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:515)
        at sun.applet.AppletPanel.run(AppletPanel.java:293)
        at java.lang.Thread.run(Thread.java:484)
java.lang.NoClassDefFoundError: javax/media/j3d/Group
        at java.lang.Class.newInstance0(Native Method)
        at java.lang.Class.newInstance(Class.java:237)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:579)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:515)
        at sun.applet.AppletPanel.run(AppletPanel.java:293)
        at java.lang.Thread.run(Thread.java:484)

Does any one know if something is missing or if I\'m doing anything wrong?

I have also copied the files in lib/ext to lib as yhey say in the installation guide at: http://www.j3d.org/faq/running.html

Best regards

Fredrik