When using a GIF with a transparent BG, you need to set the MATTE color (in save for web) to a color that is close to what the transparent gif will be put on top of. It does limit the use of the gif a bit, but it looks 10x better than making it with no matte.
PNG files support true transparency, but IE doesn't fully support it. [img]/ubbthreads/images/graemlins/frown.gif[/img] There are workarounds to enable it, but they are kind of a pain in the butt.
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