I find GIF transparency fully supported by every browser known to man (I don't think many are on text only ones these day). Seems to me if you create a image in PS 5.5 (Just paste the Poser image into a same size image with a transparent background, and use the alpha channel Poser includes to make an image mask) and transfer it to Image Ready, it will take care of all the details of converting it to 256 colors and doing a transparent background. Take about 60 seconds to do the whole deal.