merge drawings

[chris64]

This program makes a drawing by merging two drawings together but not quite the way I want it to. It joins drawing 'A' (which is a transparency) and places it on drawing 'B'. The end result is drawing 'C' which is not what I want. I want it to look like drawing 'D'.

http://content.screencast.com/users/dchr...70/bug.png

This is my line of code

image.paste(Image.open('bres sc4.png'), (int(300),int(400)))

I searched the web and think that I found the problem. I need to specify the 3rd parameter. However, I don't know how.

I think it needs to be something like this but this gives me an error

image.paste(Image.open('bres sc4.png'), (int(300),int(400)), mask='bres sc4.png'))