Image from URL will not replace

[Roger.E.Eller at sealedair.com]

Help. I can't get the image to change to a "different" image even if I
change the content of myURLimage.
After the initial run, it always shows the same image. When I examine the
properties, the fileName on the
image tab *is* updated to the new URL. Why does this not work? My script is
below.

Thanks.
~Roger

on mouseUp
  put "http://www.google.com/images/logo.gif" into myURLimage
  delete image "online image" of stack "Viewer"
  open stack "Viewer"
  create image "online image"
  set the fileName of image "online image" of stack "Viewer" to myURLimage
end mouseUp