You have two choices.
a) Use an <IMG> tag. i.e. <IMG SRC=\"$picture\" BORDER=0>
b) If the only thing you are doing is displaying the image with this script, first send the Content-type header. For example, if it is always a .jpg
Header("Content-type: image/jpeg");
This will force the browser to display the stream as an image. Hope that helps!
Chris King