[Zope] really really refresh?

I'm playing with zope2 and after using cvs I saw that the control_panel icon looked a bit odd so I copied the version from the a2 release. Pressed refresh, but still saw the odd image. Suspected caching in zope so restarted zope hit refresh, but still odd. Finally shut down netscape and the image got changed. How can I force a real refresh? -- Robin Becker