Getting an uploaded picture

I wrote a script that uploads pictures and writes them to a particular
directory on a server.

Then I wrote a script that shows a list of what pictures are in the
directory and creates a link to the picture. Everything seems to spit out
from the list just fine, but the links do not work. Not because the html in
them is wrong, but when you right-click on the picture to save it locally,
it errors out with: "The server returned an invalid or unrecognized
response".

Anyone know what this might be about?

Thanks,

-Mike