I have another annoying problem which i've racked my brains over and over.. yet i still can't seem to find an answer..
i'm hoping someone here can please show me the light!
After saving artwork as 'save for web' (jpeg or gif) in illustrator CS.. it ALWAYS leaves a thin white border around the image. It wouldn't usually be a problem except for when the webpage is a dark colour or black. Why does it do this?? Does anyone know how to avoid this frustrating problem?

After saving artwork as 'save for web' (jpeg or gif) in illustrator CS.. it ALWAYS leaves a thin white border around the image. It wouldn't usually be a problem except for when the webpage is a dark colour or black. Why does it do this?? Does anyone know how to avoid this frustrating problem?