I have been working on getting my portfollio online, and All seemed well, untill I saw the site on my friends Imac screen. The logo and buttons at the top of my website have this bizzare grey halo effect around them that makes the images look quite bad. I have checked it on the 4 PC's at my house, and I don't see the problem, even after adjusting the brightness/contrast/backlight settings of the monitors. I seem to only find this problem on the Imac, and my Ipod touch (even after adjusting those display settings as well). Can you guys tell what the problem is, I have also tried saving as multiple file types (jpg, png, gif) and it doesn't get rid of the problem. Any advise would be helpful. Thanks.