Removing iPhoto Plugins

Hi there

I have a couple of iPhoto plugins I have downloaded and used in recent months to try out various ways of exporting my photos from iPhoto '09. When I try to export photos in the usual way (File > Export), I get a tabbed dialog opening where I can choose which plugin to export with - for example, Web Page, Facebook etc. etc.

I no longer have need for some of these plugins, and I can't find any official uninstallation information -- sort of teaches me to think before I click...!

Is there a way to force these plugins out from wherever they're hiding, so I can put them into Trash and get rid of them forever?

For reference, I'd like the following plugins removed:
- SimpleViewer
- Facebook
- WebExport
whilst keeping the standard plugins (File Export, QuickTime, Web Page and Slideshow).

Any help is greatly appreciated.

Many thanks

ajlanghorn