FANTASTIC news, it think I know what the problem is now, the pictures need to be a certain size and in JPEG format otherwise certain security settings will block them on some machines, it doesn't effect me at work where the security levels are supposadly more vigorous, hmmm!
Should have it fixed for you tonight so fingers crossed, I'll also have to redo Blondegirls' picture as I'm positive she will bel getting the same error.