returning a picture from PIL

[Peter Posselt Vestergaard]

Hi
I would like to show a image on a webpage by calling a python script that
through the Python Imaging Library (PIL) loads a picture and then returns
it.
I'm trying to do it like this:
In the webpage I write:
[...]
<img src="http://www.myserver/myscript.py" height="400" width"=500>
[...]

and in myscript.py I write:

[...]
pic = Image.open(urllib.urlretrieve(url)[0])
print "Content-type: image/png\n\n"
pic.save(sys.stdout,"PNG")

the page takes some time loading the picture but nothing is ever shown. If I
change sys.stdout to "filename" the picture is stored perfectly on my disk.
Anyone who can tell me how to do this kind of output from PIL?
Thanks
Regards
Peter Vestergaard