How do I install a plug-in that came on a .jar file?

Hi,

I got this plug-in for Azureus (torrent program) and when I downloaded it, it came as a .jar file and there were no accompanying instructions (nor on the webpage). I don't know what to do with it. I tried clicking on it, but that just brigns up a notice that it "can't be launched, check for possible errors.

Please advise me on what to do.

Thanx a lot!