Subject: How can I do with the JBuilder?

I use JBuilder3 to make a JavaApplet
I just use "new project" and then "new Applet"
But when I use the Wizards/Deployment Wizard... to make a jar file,I can 
only use appletviewer to view it.I can not use the IE or NetScape to view 
it. The Netscape status bar say:Applet a1.ac1 
error:java.lang.NoClassDefFoundError:javax/swing/swingUtilites
What does that mean? Could you help me? Thank you very much!
The HTML code is:
APPLET
  CODEBASE = "."
  ARCHIVE ="a1.jar"
  CODE     = "a1.ac1.class"
  NAME     = "TestApplet"
  WIDTH    = 400
  HEIGHT   = 300
  HSPACE   = 0
  VSPACE   = 0
  ALIGN    = middle
>

Re: How can I do with the JBuilder?