[Image-SIG] Join two images

[Ronan Lucio]

Hi All,

I´d like to join two images.
Actually, I need to put a logomark (145 x 70) in front of an image (640 x 
480).
The logo should be placed in the left top of the image.

Could anybody help me how to do it with PIL?

Another question: Is it possible to do it as a watermark?

Thank you,
Ronan