That is the great benefit of PNG over GIF. You shouldn't have to matte them to specific backgrounds. Transparency is handled a lot better with PNG as it is applied on the Alpha Channel level instead of simply making 1 color out of the palette transparent.
Need more people to move to PNG now that Internet Explorer 7 supports the transparency without using DirectX. Hopefully, the days of GIF images are limited since PNG and MNG provide much better solutions.
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