Also, in addition to the programming solutions, check to make sure that the permissions for the image are correct. All directorys above the image need at least +rx for the http application user or group, and the image itself needs to be +r. To check, you can type the URL of the image directly into the browser, and see if it finds it. Also check the source of the resulting web page to make sure that it looks correct as well.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important