So obviously the yellow one minimises it, the red one closes it, but what on earth does the green one do? As far as I can tell, it just resizes the window at random! Why doesn't it just make it full screen? Surely that would be more sensible... I have been a mac user for some years but that has ALWAYS baffled me. Another thing that I don't understand is why on earth can't you scroll through images in preview? I want to just be able to click left and right to scroll through pictures in a folder like you can in (eugh) windows. I don't want to have to open iPhoto just to do that... Am I being stupid? Having found 99.9% of OSX to be straightforward and logical since switching in 2004, these 2 points really annoy me. I hope someone can please put me out of my misery! Thanks in advance.