What format should I use to attach photograhs?

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I have been trying to attach a photograph of how I connect my main outboard to my auxillary for trolling, but when I try to upload it, I get an "incorrect format" message on my screen? what format should I be using?
blueskip

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Upload the photo's to the gallery in most picture formats gif/jpg/jpeg/png and then link them to your post.

FAQ on how to do it here: http://maltafishingforum.com/talk/index.php?topic=528.0