Bravenet used to run some software that corrected case sensitivity errors on their customers' html. However they have stopped using this (I suspect that it was not compatible with their latest hardware or operating systems).
Your image ParkInn5.gif is referenced on your site as parkinn5.gif - simple correct the typos and you will be fine.
Thanks Peter your advice did the trick. I'd been trying for hours to sort it out and I would never have thought about case sensitive gifs in a million years.