Converting a webkit plugin to NPAPI?

Hello, I have to convert a webkit based plugin to an NPAPI based
plugin due to Apple recently deprecating the webkit plugin with Safari
5.1.  The good news is that this plugin will now be capable of running
on other browsers that support NPAPI.  The bad news is that I am
completely unfamiliar with the interfaces.

My plugin is a cocoa based plugin that shows video from a series of
jpg images received from an NVR (analogous to mjpeg).  In short, it
creates an NSImage from a bitmap and sets it on the NSImageView when
received every frame interval.  My goal is to change as little as
possible to get this working.  Can someone shed some light on