In Windows XP/Vista, if you are navigating in a folder containing pictures, and you click any picture, it opens up Windows built in preview program. Much like OSX. However, in Windows, you can click "Next/Previous" within that program to quickly flip through those photos. Why do the up & down arrows in OSX not work? I still prefer my iMac to any PC I have owned, but this one little thing bugs me to no end. Is there a setting I can change somewhere to make that work like in Windows?