Didn;t you already ask this? It doesn't make sense. How would you put the plug-in behind the person? You can't. The mask won't go in the exact places you need it around your person. Unless you make the item that is in front of the greenscreen a plug-in also, it won't work. And I don't think you can do that if you are asking for someone to make a SIMPLE greenscreen. There would be no point of it. Just do what I do... GET a program called BLUE SCREEN OF LIFE.. Go to www.brickfilms.com
, go to the resources section, and click on the link to Blue Screen of Life and get it. You color the backgrouynd as you go so you do not need to get a plug-in or an actual screen. Or get Jasc's prorgam called Animation shop and do the easy green screening there... That is much easier.
 = Jasc is a software company. Go to www.jasc.com
to get to the main site. IT has some useful stuff. Hope this helps and please do not ask for another green screen plug-in. BYe.