I'm trying to make a powerpoint presentation, and I need to include many photographs that I have in iPhoto. Powerpoint is not letting do so however: it says that the photos (which are JPGs) are either unsupported or damaged. They open fine, however, in Photoshop, iPhoto, Preview, etc. Can anybody give any advice? If the advice is to buy iWork, that's not really an option, as I need to finish the presentation by tomorrow.